CN117129555A - Mass spectrum detection method, system and equipment for volatile organic compounds - Google Patents
Mass spectrum detection method, system and equipment for volatile organic compounds Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 76
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 67
- 238000001819 mass spectrum Methods 0.000 title claims abstract description 43
- 150000002500 ions Chemical class 0.000 claims abstract description 85
- 238000004458 analytical method Methods 0.000 claims abstract description 45
- 230000005684 electric field Effects 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000009792 diffusion process Methods 0.000 claims description 24
- 238000004949 mass spectrometry Methods 0.000 claims description 24
- 230000007423 decrease Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 148
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- 230000035945 sensitivity Effects 0.000 description 5
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- 239000011261 inert gas Substances 0.000 description 3
- 238000005040 ion trap Methods 0.000 description 3
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- 230000003068 static effect Effects 0.000 description 3
- 238000001196 time-of-flight mass spectrum Methods 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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Abstract
The invention provides a mass spectrum detection method, a system and equipment for volatile organic compounds, wherein the method comprises the following steps: receiving target gas provided by a sample injection module; focusing and organizing the target gas through the first aerodynamic structure to form a first gas flow of the target gas; the target gas is contracted and expanded through the second aerodynamic structure to form an accelerated jet flow of the target gas, and the accelerated jet flow of the target gas enters a vacuum ultraviolet light source irradiation area for ionization; the sound wave driving module generates a standing wave, and the standing wave limits the accelerated jet flow of the target gas to be positioned in the irradiation area of the vacuum ultraviolet light source for continuous ionization to obtain target ions and target gas which is not ionized completely; the standing wave also controls the incompletely ionized target gas to be ionized continuously in the irradiation area of the vacuum ultraviolet light source; the guiding electric field generated by the sound wave driving module guides target ions to enter the mass analysis module; the target ions leave the mass analysis module and then enter the ion detection module to obtain a mass spectrum detection result.
Description
Technical Field
The invention relates to the technical field of analytical instruments, in particular to a mass spectrum detection method, a system and equipment for volatile organic compounds.
Background
Volatile Organic Compounds (VOCs) are widely present in the air environment, and many VOCs have some toxicity, which may be harmful to human health and the ecological environment. Therefore, the development of a rapid and high-sensitivity detection technology for VOCs has important significance. At present, vacuum ultraviolet ionization source coupling mass spectrometry (VUV-IMS) is widely applied to VOCs detection due to the remarkable advantages of low background noise, high sensitivity and the like. However, when the vacuum ultraviolet ionization source works in an ultra-high vacuum environment, the ionization occurs by means of photons and sample molecules, and the diffusion speed is very slow under the vacuum condition because VOCs belong to organic gases with small molecular weight. This results in a very limited number of VOCs that can diffuse into the ionization chamber and collide with the uv photons, thus making the ionization efficiency of VOCs very low. The detection sensitivity is directly related to ionization efficiency, and the detection sensitivity of VOCs is difficult to improve and thus becomes a bottleneck of the technology.
Aiming at the problem that organic gas is difficult to diffuse freely under vacuum condition, although inert gas is added into the existing instruments on the market to promote the organic gas to diffuse rapidly, the method not only needs to consider how the inert gas is added and how the inert gas is matched with the organic gas to realize the diffusion acceleration, but also needs to consider the influence on the detection result.
Disclosure of Invention
In order to overcome the problems in the related art, the application aims to provide a mass spectrum detection method, a system and equipment for volatile organic compounds, which are used for enabling VOCs gas to be rapidly converged into an ionization region by utilizing an aerodynamic focusing principle through flow channel design.
In a first aspect, the present application provides a method for mass spectrometry detection of a volatile organic compound, the method comprising:
receiving target gas provided by a sample injection module, wherein the target gas is a volatile organic compound;
focusing and organizing the target gas through a first aerodynamic structure to form a first gas flow of the target gas;
the first airflow of the target gas is contracted and expanded through the second aerodynamic structure to form an accelerated jet flow of the target gas, and the accelerated jet flow of the target gas enters a vacuum ultraviolet light source irradiation area for ionization;
the sound wave driving module generates a standing wave, the standing wave limits the accelerated jet flow of the target gas to be located in the irradiation area of the vacuum ultraviolet light source for continuous ionization, and target ions and target gas which is not ionized completely are obtained;
the standing wave also controls the target gas which is not completely ionized to be ionized continuously in the irradiation area of the vacuum ultraviolet light source, and target ions are continuously obtained;
The guiding electric field generated by the sound wave driving module guides the target ions to accelerate to leave the irradiation area of the vacuum ultraviolet light source and enter the mass analysis module for mass analysis;
and the target ions after passing through the mass analysis module enter the ion detection module to obtain a mass spectrum detection result.
It should be noted that, the first aerodynamic structure and the second aerodynamic structure are designed based on the principle that the pressure difference at two ends of the inlet and outlet of the aerodynamic device can generate stable accelerated airflow, and the acoustic wave driving module only needs to generate a guiding electric field by applying a voltage after adding an electric field sheet on the surface, so that the target ions are guided to leave the irradiation area of the vacuum ultraviolet light source and enter the mass analysis module, the guiding electric field can also reduce the adsorption loss and the background effect of the VOCs ions on the wall surface, and specific electric field sheet applying positions and sizes can be adjusted by those skilled in the art based on the realization of the acceleration transportation of the ions to the designated positions according to actual requirements, and will not be repeated herein.
In one embodiment, the ionization energy of the irradiated region of the vacuum ultraviolet light source is 10.6eV, and the ionization energy of most VOCs components is less than 10.6eV, and thus can be ionized in the ion source. In contrast, molecules such as N2, O2, and H2O in the atmosphere cannot be ionized if their ionization energy is greater than 10.6 and eV. Therefore, the irradiation of the vacuum ultraviolet light source under the ionization energy of 10.6eV can obtain a mass spectrum chart with less interference.
In one embodiment, the central axes of the inlet and outlet of the first aerodynamic structure and the second aerodynamic structure are each the same central axis.
It should be noted that, the inlet and the outlet of the first aerodynamic structure and the second aerodynamic structure are annular ports, and the inlet and the outlet of the first aerodynamic structure and the outlet of the second aerodynamic structure are defined on the same central axis, so that the target gas can be ensured to quickly reach the irradiation area of the vacuum ultraviolet light source on the straight line channel, and the loss of kinetic energy in the middle process is avoided.
In one embodiment, the first aerodynamic structure is specifically an aerodynamic lens tube, the aerodynamic lens tube includes a cylindrical pipe and a first flow guiding ring and a second flow guiding ring in the cylindrical pipe, the first flow guiding ring and the second flow guiding ring are sequentially arranged in the cylindrical pipe along the flow direction of the target gas at predetermined intervals, the central axis of the first flow guiding ring and the central axis of the second flow guiding ring are the same central axis, the cylindrical pipe cooperates with the first flow guiding ring and the second flow guiding ring to form a flow guiding air passage in the cylindrical pipe, and the target gas is focused and organized to form a first air flow of the target gas when flowing through the flow guiding air passage.
In one embodiment, the first diversion ring and the second diversion ring are integrally formed with the cylindrical channel, and the first diversion ring and the second diversion ring are formed by inwards sinking the circumferential direction of the pipe wall of the cylindrical pipe.
In one embodiment, the first diversion ring and the second diversion ring are respectively a first diversion ring sheet and a second diversion ring sheet, and the first diversion ring sheet and the second diversion ring sheet are detachably installed in the cylindrical pipeline.
In one embodiment, the first flow guiding ring comprises an inflow side and an outflow side, the through-flow cross-sectional area of the first flow guiding ring gradually decreases from the inflow side towards the outflow side, the second flow guiding ring comprises an inflow side and an outflow side, and the through-flow cross-sectional area of the second flow guiding ring gradually decreases from the inflow side towards the outflow side.
The target gas is collected at the inflow side, and when the target gas flows out through the annular center, the target gas is collected into an accelerated gas flow to flow out from the outflow side, the flow speed of the target gas is increased due to the reduction of the cross-sectional area of the through flow, the pressure difference at two sides can be caused by the different flow speeds of the target gas at the outflow side, the target gas collected at the inflow side can be further sucked to flow out at the outflow side, and molecules can be gradually converged on the central axis in the special flow field. Once the molecules converge on the central axis, the molecules will remain on the central axis all the time, even in the divergent fluid at the nozzle.
In one embodiment, the second aerodynamic structure is specifically a Laval pipe, the Laval pipe includes an air inlet shrinkage section, a throat section and an air outlet diffusion section which are sequentially communicated, an inlet of the air inlet shrinkage section is further communicated with the aerodynamic lens pipe, an outlet of the air outlet diffusion section is communicated with the vacuum ultraviolet light source irradiation area, a through flow sectional area of the air inlet shrinkage section is gradually reduced along a flow direction of the target air flow, a through flow sectional area of the air outlet diffusion section is gradually increased along the flow direction of the target air, and a first air flow of the target air is shrunk and diffused when flowing through the air inlet shrinkage section, the throat section and the air outlet diffusion section to form an accelerating jet flow of the target air.
It should be noted that when the gas flows in the laval tube, the dynamic pressure reaches the maximum value and the static pressure reaches the minimum value in the throat section, the speed of the target gas increases due to the decrease of the cross-sectional area of the through flow, and the whole surge flow is subjected to the pipeline shrinking process in the same time, so that the pressure is also reduced at the same time, and a pressure difference is generated, and meanwhile, the laval tube also converts the fluid heat energy into the kinetic energy, so that an accelerated jet with high molecular concentration and small air flow cross-sectional area enters the vacuum ultraviolet light source irradiation area, and a person skilled in the art can adjust the size of the laval tube according to the required speed of the accelerated jet so that the accelerated jet of the target gas enters the vacuum ultraviolet light source irradiation area at a proper speed.
In one embodiment, the aerodynamic lens tube is integrally formed with the Laval tube.
In one embodiment, the acoustic driving module firstly emits acoustic waves with preset parameters to generate standing waves, then applies voltage with preset parameters on the surface of the acoustic driving module to generate guiding electric fields, and the standing waves and the guiding electric fields are sequentially generated to ensure that the target gas is fully electrifiedThe target ions are guided to leave the ionization region only after the ion separation, specifically, the intensity of the sound wave is about 0.0001-0.1W/m 2 The frequency of the sound wave is about 30-40 MHz, the voltage value is about-5 to-50, and the parameters can be adjusted based on the speed of the target gas flowing into the irradiation area of the vacuum ultraviolet light source.
In one embodiment, the acoustic wave driving module emits acoustic waves of a predetermined parameter to generate standing waves, and simultaneously applies a voltage of the predetermined parameter to the surface of the acoustic wave driving module to generate a guiding electric field. Specifically, the intensity of the sound wave is about 0.0001-0.1W/m 2 The frequency of the sound wave is about 30-40 MHz, the voltage value is about-5 to-50, and the parameters can be adjusted based on the speed of the target gas flowing into the irradiation area of the vacuum ultraviolet light source.
In one embodiment, after the target ions leave the vacuum ultraviolet irradiation source region, the target ions are focused by the first focusing electrode group and accelerated to enter the mass analysis module for analysis, and then focused by the second focusing electrode group and accelerated to enter the ion detection module for acquiring mass spectrum information.
In one embodiment, the first mass analysis module is one of a time-of-flight mass spectrum, a quadrupole mass spectrum, and an ion trap mass spectrum.
In a second aspect, the present application also provides a mass spectrometry detection system for volatile organic compounds, comprising:
the sample injection module is used for providing target gas which is a volatile organic compound;
a first aerodynamic module for focusing and organizing the target gas into a first gas flow of the target gas;
the second aerodynamic module is used for contracting and expanding the first airflow of the target gas to form an accelerated jet of the target gas; the vacuum ultraviolet light source irradiation module is used for providing vacuum ionization environment and ultraviolet light for ionization;
the sound wave driving module is used for generating a standing wave and a guiding electric field, the standing wave enables the accelerating jet flow of the target gas to be limited in the irradiation area of the vacuum ultraviolet light source for continuous ionization so as to obtain target ions and target gas which is not ionized completely, and the guiding electric field guides the target ions to leave the irradiation area of the vacuum ultraviolet light source and accelerate to enter the mass analysis module and the ion detection module so as to obtain a mass spectrum detection result;
The mass analysis module is used for carrying out mass analysis on the target ions;
and the ion detection module is used for acquiring mass spectrum information of the target ions.
In one embodiment, a mass spectrometry detection system for a volatile organic compound further comprises a first focusing electrode set module for focusing and accelerating the target ions into the mass analysis module.
In one embodiment, a mass spectrometry detection system for a volatile organic compound further comprises a second focusing electrode set module for focusing and accelerating the target ions into the ion detection module.
In a third aspect, the present application also provides a mass spectrometry detection apparatus for a volatile organic compound, comprising a memory and a processor, the memory storing a computer program, characterised in that the processor when executing the computer program implements a method for mass spectrometry detection of a volatile organic compound as described above.
The beneficial effects of the application are as follows:
the mass spectrum detection method, system and equipment for the volatile organic compound firstly receives the target gas from the sample injection module, the target gas enters the first aerodynamic structure and passes through the aerodynamic diversion airway, based on the principle that the pressure difference at two ends in the aerodynamic structure can generate stable accelerated airflow, the target gas is focused and organized in the aerodynamic structure to form a first airflow of the target gas which is accelerated and flows out, the first airflow of the target gas is more concentrated in molecular beams in the first airflow of the target gas compared with the target gas which is not formed into the airflow and is provided by the sample injection module, the sample injection efficiency is higher, and then after the first airflow of the target gas is contracted and expanded through the second aerodynamic structure, the accelerated jet of the target gas is formed, the accelerated jet of the target gas is faster in flow speed than the first airflow of the target gas, the molecular beam is more concentrated, the transmission efficiency is improved, the ionization efficiency is improved, then, the problem of slow diffusion caused by a vacuum environment is quickly overcome by the accelerated jet of the target gas, the vacuum ultraviolet light source irradiation area can be quickly entered, at the moment, the sound wave driving module generates standing waves, the accelerated jet of the target gas which has high speed and is concentrated by the molecular beam is limited in the vacuum ultraviolet light source irradiation area to carry out continuous ionization, the target ions and the target gas which is not completely ionized are obtained, the standing waves can effectively lead the target gas which quickly enters the vacuum ultraviolet light source irradiation area to stay in the vacuum ultraviolet light source irradiation area, or the target gas slowly flows in the vacuum ultraviolet light source irradiation area to realize sufficient ionization, and in the process of the sufficient ionization, the sound wave driving module also generates a guiding electric field, the target ions are guided to leave the irradiation area of the vacuum ultraviolet light source, so that space charge effect caused by the fact that the target ions stay in the ionization area in the ionization process is avoided, the ionization reaction cannot further occur, and finally the target ions guided by the electric field enter a subsequent mass analysis module and an ion detection module to obtain a mass spectrum detection result;
The mass spectrum detection method and the mass spectrum detection system for the volatile organic compounds can overcome the problems that target gas in a vacuum environment is slow in diffusion and not concentrated in molecular weight, and VOCs are obviously dispersed in the vacuum environment to cause molecular loss before ionization, so that the quick and efficient ionization of the VOCs is realized, the sensitivity and the response speed of the detection of the VOCs are greatly improved, and the method and the system have important significance for improving the capability of environmental monitoring and pollution control.
Drawings
FIG. 1 is a schematic diagram of a mass spectrometry detection system for a volatile organic compound according to one embodiment;
FIG. 2 is a flow chart of a method for mass spectrometry detection of a volatile organic compound in one embodiment;
fig. 3 is a schematic diagram of a mass spectrometry detection apparatus for volatile organic compounds in one embodiment.
Reference numerals:
1. a sample injection module; 2. a first aerodynamic module; 21. a cylindrical pipe; 22. a first deflector ring; 23. a second deflector ring; 3. a second aerodynamic module; 31. an intake contraction section; 32. a throat section; 33. an air outlet diffusion section; 4. a vacuum ultraviolet light source irradiation module; 5. an acoustic wave driving module; 6. a first focusing electrode module; 7. a mass analysis module; 8 a second focusing electrode module; 9. a vacuum pump interface; a. a first focal region; b. a second focusing region; c. the vacuum ultraviolet light source irradiates the area.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another.
In order to facilitate understanding of the embodiments of the present application, a method for detecting a volatile organic compound by mass spectrometry in the related art will be described.
As shown in fig. 1, in the mass spectrum detection system for a volatile organic compound according to the first embodiment of the present application, the mass spectrum detection method for a volatile organic compound according to the present application may be applied to the mass spectrum detection system for a volatile organic compound. The mass spectrum detection system of the volatile organic compound comprises:
the sample injection module 1 is used for providing target gas, wherein the target gas is a volatile organic compound; in practical application, the sample injection module 1 may be a capillary sample injection tube.
A first aerodynamic module 2 for focusing and organizing said target gas into a first gas flow of target gas;
a second aerodynamic module 3 for constricting and expanding the first flow of the target gas to form an accelerated jet of the target gas; it should be noted that, the first aerodynamic structure and the second aerodynamic structure are designed based on the principle that the pressure difference at two ends of the inlet and outlet of the aerodynamic device can generate stable accelerated airflow, the acoustic wave driving module 5 only needs to add an electric field plate on the surface, and then apply a voltage to achieve the effect of generating a guiding electric field, and specific electric field plate application positions and sizes can be adjusted by those skilled in the art according to actual needs, which will not be repeated herein. A vacuum ultraviolet light source irradiation module 4 for providing vacuum ionization environment and ultraviolet light for ionization; specifically, the vacuum ionization environment is a vacuum ultraviolet light source irradiation region c, the ionization energy of the vacuum ultraviolet light source irradiation region c is 10.6eV, and the ionization energy of most of VOCs components is less than 10.6eV, so that the vacuum ionization environment can be ionized in an ion source. In contrast, molecules such as N2, O2, and H2O in the atmosphere cannot be ionized if their ionization energy is greater than 10.6 and eV. Therefore, the irradiation of the vacuum ultraviolet light source under the ionization energy of 10.6eV can obtain a mass spectrum chart with less interference.
The acoustic wave driving module 5 is used for generating a standing wave and a guiding electric field, the standing wave enables the accelerating jet flow of the target gas to be limited in the irradiation area c of the vacuum ultraviolet light source for continuous ionization so as to obtain target ions and target gas which is not ionized completely, and the guiding electric field guides the target ions to leave the irradiation area c of the vacuum ultraviolet light source and accelerate into the mass analysis module 7 and the ion detection module so as to obtain a mass spectrum detection result;
a first focusing electrode group module for focusing and accelerating the target ions into the mass analysis module 7.
And the mass analysis module 7 is used for carrying out mass analysis on the target ions.
A second focusing electrode group module for focusing and accelerating the target ions into
The ion detection module.
And the ion detection module is used for acquiring mass spectrum information of the target ions.
And the vacuum pump module is used for vacuumizing the vacuum ultraviolet light source irradiation area c, and particularly is communicated with the vacuum ultraviolet light source irradiation area c through a vacuum pump interface 9.
Next, the implementation of the mass spectrometry detection system for the volatile organic compound will be further described.
In one embodiment, the central axes of the inlet and the outlet of the first aerodynamic structure and the second aerodynamic structure are the same central axis, and it should be noted that the inlet and the outlet of the first aerodynamic structure and the second aerodynamic structure are annular ports, and the inlet and the outlet of the aerodynamic structure are limited on the same central axis, so that the target gas can be ensured to quickly reach the vacuum ultraviolet light source irradiation area c on the straight line channel, and the loss of kinetic energy in the middle process is avoided.
In one embodiment, the first aerodynamic structure is specifically an aerodynamic lens tube, the aerodynamic lens tube includes a cylindrical pipe 21, and a first flow guiding ring 22 and a second flow guiding ring 23 in the cylindrical pipe 21, the first flow guiding ring 22 and the second flow guiding ring 23 are sequentially disposed in the cylindrical pipe 21 along the flow direction of the target gas at predetermined intervals, the central axes of the first flow guiding ring 22 and the second flow guiding ring 23 are the same central axis, the cylindrical pipe 21 cooperates with the first flow guiding ring 22 and the second flow guiding ring 23 to form a flow guiding air passage in the cylindrical pipe 21, and the target gas is focused and organized in a first focusing area a to form the first air flow when flowing through the flow guiding air passage.
In one specific embodiment, the first diversion ring 22 and the second diversion ring 23 are integrally formed with the cylindrical pipe 21, and the first diversion ring 22 and the second diversion ring 23 are formed by recessing the pipe wall circumference of the cylindrical pipe 21 inwards.
In one embodiment, the first diversion ring 22 and the second diversion ring 23 are respectively a first diversion ring sheet and a second diversion ring sheet, and the first diversion ring sheet and the second diversion ring sheet are detachably installed in the cylindrical pipe.
Specifically, the first diversion ring 22 includes an inflow side and an outflow side, the through-flow cross-sectional area of the first diversion ring 22 gradually decreases from the inflow side toward the outflow side, the second diversion ring 23 includes an inflow side and an outflow side, and the through-flow cross-sectional area of the second diversion ring 23 gradually decreases from the inflow side toward the outflow side.
The target gas is collected and organized in the first focusing area a or the second focusing area c at the inflow side, the accelerated gas flows out from the outflow side when flowing out through the guide ring, the flow speed of the target gas is increased due to the reduction of the cross-sectional area of the through flow, the pressure difference at two sides is caused by the different flow speeds of the target gas at two sides at the outflow side, the target gas collected at the inflow side is further sucked at the outflow side, and molecules are gradually converged on the central axis in the special flow field. Once the molecules converge on the central axis, the molecules will remain on the central axis all the time, even in the divergent flow of the second aerodynamic structure outlet.
It should be further noted that, the size of the inner diameter of the guiding ring, the gas pressure at the inlet and outlet and the gas flow rate determine the particle size capable of focusing together, and in a specific preferred embodiment, the size range of the inner diameter of the guiding ring is 0.5 mm-2 mm, and the air inflow range is 1-2 l/min, and it is understood that the air inflow and the air inflow pressure are determined by parameters such as the vacuum degree of the irradiation area of the vacuum ultraviolet ionization source and the size of the inner diameter of the guiding ring, which will not be repeated herein.
In one embodiment, the distance between the first flow guiding ring 22 and the second flow guiding ring is 10-20 mm, and in principle, when the distance between the two flow guiding rings is designed, enough space needs to be ensured to enable the air field to fully recover the laminar state before reaching the next flow guiding ring, the distance between the flow guiding rings is generally 50 times of the inner diameter of the flow guiding ring of the first flow guiding ring 22, and of course, a person skilled in the art can confirm a specific numerical value according to the reynolds number of the gas in the first flow guiding ring 22.
In one embodiment, the second aerodynamic structure is specifically a Laval pipe, the Laval pipe includes an air inlet shrinkage section 31, a throat section 32 and an air outlet diffusion section 33 which are sequentially communicated, the inlet of the air inlet shrinkage section 31 is further communicated with the first aerodynamic structure, the outlet of the air outlet diffusion section 33 is communicated with the vacuum ultraviolet light source irradiation area c, the through-flow cross-sectional area of the air inlet shrinkage section 31 is gradually reduced along the flow direction of the target air flow, the through-flow cross-sectional area of the air outlet diffusion section 33 is gradually increased along the flow direction of the target air flow, and the first air flow of the target air is shrunk and diffused to form an accelerated jet of the target air when flowing through the air inlet shrinkage section 31, the throat section 32 and the air outlet diffusion section 33.
It should be noted that, when the gas flows in the laval tube, the dynamic pressure reaches a maximum value and the static pressure reaches a minimum value in the throat section 32, the speed of the target gas increases due to the decrease of the cross-sectional area of the through flow, and the whole surge flow is subjected to the pipeline shrinking process in the same time, so that the pressure is also reduced at the same time, and a pressure difference is generated, at the same time, the laval tube converts the fluid heat energy into kinetic energy, so as to form an accelerated jet with high molecular concentration and small air flow cross-sectional area into the vacuum ultraviolet light source irradiation area c, wherein, a person skilled in the art can adjust the size of the laval tube according to the required speed of the accelerated jet so that the accelerated jet of the target gas enters the vacuum ultraviolet light source irradiation area c at a proper speed.
In one embodiment, the aerodynamic lens tube is integrally formed with the Laval tube.
In one embodiment, the acoustic wave driving module 5 firstly emits an acoustic wave with a predetermined parameter to generate a standing wave, and then applies a voltage with the predetermined parameter to the surface of the acoustic wave driving module 5 to generate a guiding electric field. Specifically, the intensity of the sound wave is about 0.0001-0.1W/m 2 The frequency of the sound wave is about 30-40 MHz, the bottom of the sound wave driving module 5 is a metal conductive disc, a voltage is applied to the metal conductive disc to form a guiding electric field, the voltage can be-5V to-50V, the direction of the guiding electric field is vertical to the surface of the disc, and of course, the parameters can be adjusted based on the speed of the target gas flowing into the irradiation area of the vacuum ultraviolet light source.
In one embodiment, the acoustic driving module 5 emits acoustic waves with predetermined parameters to generate the standing wave, and simultaneously applies a voltage with predetermined parameters to the surface of the acoustic driving module 5 to generate the guiding electric field, so that the ionization speed can be further accelerated by simultaneously generating the standing wave and the guiding electric field, unlike sequentially generating the standing wave and the guiding electric field.
In one embodiment, after the target ions leave the vacuum ultraviolet irradiation source region, the target ions are focused by the first focusing electrode set and accelerated into the mass analysis module 7 for analysis, and then focused by the second focusing electrode set and accelerated into the ion detection module for acquiring mass spectrum information.
In one embodiment, the mass analysis module 7 is one of a time-of-flight mass spectrum, a quadrupole mass spectrum, and an ion trap mass spectrum.
In a preferred implementation manner of the embodiment of the present invention, referring to fig. 1, a specific connection structure of a mass spectrum detection system for a volatile organic compound is as follows: the inlet of the first aerodynamic structure is communicated with the sample injection module 1, the outlet of the first aerodynamic structure is connected with the inlet of the second aerodynamic structure, the outlet of the second aerodynamic structure is communicated with the inlet of the vacuum ultraviolet light source irradiation area c, the sound wave driving module 5 is arranged on one side of the outlet of the vacuum ultraviolet light source irradiation area c, the inlet of the first focusing electrode module 6 is communicated with the inlet of the vacuum ultraviolet light source irradiation area c, the outlet of the first focusing electrode module 6 is communicated with the inlet of the mass analysis module 7, the outlet of the mass analysis module 7 is communicated with the inlet of the second focusing electrode module 8, and the outlet of the second focusing electrode module 8 is communicated with the mass spectrum detection module (not shown).
Continuing with FIG. 1, the mass spectrometry detection system for the volatile organic compounds of the system operates as follows: firstly, receiving target gas from a sample injection module 1, wherein the target gas enters a first aerodynamic structure and passes through an aerodynamic flow guide air passage, based on the principle that the pressure difference at two ends of an inlet and an outlet of a device in aerodynamics can generate stable accelerated airflow, the target gas is focused and organized in a first focusing area a and a second focusing area b in the aerodynamic structure to form a first airflow of the target gas which is accelerated and flows out, the first airflow of the target gas is more concentrated in molecular beams in the first airflow of the target gas compared with the target gas which is not formed into the airflow and is provided by the sample injection module, the sample injection efficiency is higher, and then after the first airflow of the target gas is contracted and expanded through the second aerodynamics, the accelerated jet of the target gas is formed, the accelerated jet of the target gas is faster in flow speed than the first airflow of the target gas, and the molecular beam is more concentrated, not only improves the transmission efficiency, but also improves the ionization efficiency, then, the accelerated jet of the target gas rapidly overcomes the problem of slow diffusion caused by the vacuum environment and rapidly enters the vacuum ultraviolet light source irradiation area c, at this time, the acoustic wave driving module 5 generates standing waves, so that the accelerated jet of the target gas which has high speed and is concentrated by the molecular beam is limited in the vacuum ultraviolet light source irradiation area c for continuous ionization, target ions and incompletely ionized target gas are obtained, the standing waves can effectively ensure that the target gas which rapidly enters the vacuum ultraviolet light source irradiation area c stays in the vacuum ultraviolet light source irradiation area c, or the target gas slowly flows in the vacuum ultraviolet light source irradiation area c to realize sufficient ionization, and in the process of the sufficient ionization, the acoustic wave driving module 5 also generates a guiding electric field, and guiding the target ions to leave the irradiation region c of the vacuum ultraviolet light source, avoiding space charge effect caused by the fact that the target ions stay in the ionization region in the ionization process, enabling the ionization reaction not to further occur, and finally enabling the target ions guided by the electric field to enter the first focusing electrode module 6, the mass analysis module 7, the second focusing electrode module 8 and the ion detection module at one time so as to obtain a mass spectrum detection result.
As shown in fig. 2, a method for detecting a volatile organic compound according to a second embodiment of the present invention is provided, and the method is applied to the mass spectrum detection system of the volatile organic compound in fig. 1, and may include the following steps:
s100, receiving target gas provided by a sample injection module 1, wherein the target gas is a volatile organic compound;
s200, focusing and organizing the target gas through a first aerodynamic structure to form a first gas flow of the target gas;
it should be noted that, the first aerodynamic structure and the second aerodynamic structure are designed based on the principle that the pressure difference at two ends of the inlet and outlet of the aerodynamic device can generate stable accelerated airflow, the acoustic wave driving module 5 only needs to apply a voltage to achieve the effect of generating a guiding electric field to guide the target ions to leave the irradiation area of the vacuum ultraviolet light source and then enter the mass analysis module after adding an electric field sheet on the surface, the guiding electric field can also reduce the adsorption loss and the background effect of the VOCs ions on the wall surface, and the specific electric field sheet application position and size can be adjusted by those skilled in the art based on the realization of the accelerated transportation of the ions to the designated position according to the actual requirement, which is not repeated herein.
S300, the first airflow of the target gas is contracted and expanded through the second aerodynamic structure to form an accelerated jet flow of the target gas, and the accelerated jet flow of the target gas enters a vacuum ultraviolet light source irradiation area c for ionization;
specifically, the ionization energy of the irradiation region c of the vacuum ultraviolet light source is 10.6eV, and the ionization energy of most of the VOCs is less than 10.6eV, so that it can be ionized in the ion source. In contrast, molecules such as N2, O2, and H2O in the atmosphere cannot be ionized if their ionization energy is greater than 10.6 and eV. Therefore, the irradiation of the vacuum ultraviolet light source under the ionization energy of 10.6eV can obtain a mass spectrum chart with less interference.
And S400, the acoustic wave driving module 5 generates a standing wave which limits the accelerated jet flow of the target gas to be located in the vacuum ultraviolet light source irradiation area c for continuous ionization to obtain target ions and target gas which is not ionized completely, and the standing wave also controls the target gas which is not ionized completely to be ionized continuously in the vacuum ultraviolet light source irradiation area c for continuous ionization to obtain target ions.
S500, guiding the target ions to accelerate to leave the irradiation area c of the vacuum ultraviolet light source by the guiding electric field generated by the acoustic wave driving module 5, and entering the mass analysis module 7 for mass analysis;
S600, target ions after passing through the mass analysis module 7 enter the ion detection module to obtain a mass spectrum detection result.
In one embodiment, the inlets and outlets of the first aerodynamic structure and the second aerodynamic structure are located on the same central axis, and the inlets and outlets of the first aerodynamic structure and the second aerodynamic structure are defined on the same central axis, so that the target gas can reach the irradiation area c of the vacuum ultraviolet light source quickly on a straight line channel, and kinetic energy loss in the middle process is avoided.
In one embodiment, the first aerodynamic structure is specifically an aerodynamic lens tube, the aerodynamic lens tube includes a cylindrical pipe 21, and a first flow guiding ring 22 and a second flow guiding ring 23 in the cylindrical pipe 21, the first flow guiding ring 22 and the second flow guiding ring 23 are sequentially disposed in the cylindrical pipe 21 along the flow direction of the target gas at predetermined intervals, the central axes of the first flow guiding ring 22 and the second flow guiding ring 23 are the same central axis, the cylindrical pipe 21 cooperates with the first flow guiding ring 22 and the second flow guiding ring 23 to form a flow guiding air passage in the cylindrical pipe 21, and the target gas is focused and organized in a first focusing area a to form the first air flow when flowing through the flow guiding air passage.
In one embodiment, the first and second diversion rings 22 and 23 are integrally formed with the cylindrical pipe 21, and the first and second diversion rings 22 and 23 are formed by recessing the pipe wall circumference of the cylindrical pipe 21 inwards
In one embodiment, the first diversion ring 22 and the second diversion ring 23 are respectively a first diversion ring sheet and a second diversion ring sheet, and the first diversion ring sheet and the second diversion ring sheet are detachably installed in the cylindrical pipe.
In one embodiment, the distance between the first flow guiding ring 22 and the second flow guiding ring is 10-20 mm, and in principle, when the distance between the two flow guiding rings is designed, enough space needs to be ensured to enable the air field to fully recover the laminar state before reaching the next flow guiding ring, the distance between the flow guiding rings is generally 50 times of the inner diameter of the flow guiding ring of the first flow guiding ring 22, and of course, a person skilled in the art can confirm a specific numerical value according to the reynolds number of the gas in the first flow guiding ring 22.
In one embodiment, the first diversion ring 22 includes an inflow side and an outflow side, the through-flow cross-sectional area of the first diversion ring 22 gradually decreases from the inflow side toward the outflow side, the second diversion ring 23 includes an inflow side and an outflow side, and the through-flow cross-sectional area of the second diversion ring 23 gradually decreases from the inflow side toward the outflow side.
The target gas is collected at the inflow side, and when the target gas flows out through the flow guiding circular ring, the target gas is collected into an accelerated gas flow to flow out from the outflow side, the flow speed of the target gas is increased due to the reduction of the cross-sectional area of the through flow, the pressure difference at two sides can be caused by the different flow speeds of the target gas at the outflow side at the inflow side, the target gas collected at the inflow side can be further sucked to flow out at the outflow side, and molecules can be gradually converged on the central axis in the special flow field. Once the molecules converge on the central axis, the molecules will remain on the central axis all the time, even in the divergent fluid at the nozzle.
It should be further noted that, the size of the inner diameter of the guiding ring, the gas pressure at the inlet and outlet and the gas flow rate determine the particle size capable of focusing together, and in a specific preferred embodiment, the size range of the inner diameter of the guiding ring is 0.5 mm-2 mm, and the air inflow range is 1-2 l/min, and it is understood that the air inflow and the air inflow pressure are determined by parameters such as the vacuum degree of the irradiation area of the vacuum ultraviolet ionization source and the size of the inner diameter of the guiding ring, which will not be repeated herein.
In one embodiment, the distance between the first diversion ring 22 and the second diversion ring is 10-20 mm, in principle, when the distance between the two diversion rings is designed, enough space needs to be ensured to enable the air field to fully recover the laminar flow state before reaching the next sheet, and the distance between the diversion rings is generally 50 times of the inner diameter of the diversion ring of the first diversion ring 22, and of course, a person skilled in the art can confirm a specific value according to the reynolds number of the air in the first diversion ring 22.
In one embodiment, the second aerodynamic structure is specifically a Laval pipe, the Laval pipe includes an air inlet shrinkage section 31, a throat section 32 and an air outlet diffusion section 33 which are sequentially communicated, an inlet of the air inlet shrinkage section 31 is further communicated with the aerodynamic lens pipe, an outlet of the air outlet diffusion section 33 is communicated with the vacuum ultraviolet light source irradiation area c, a through flow cross-sectional area of the air inlet shrinkage section 31 is gradually reduced along a flow direction of a target air flow, a through flow cross-sectional area of the air outlet diffusion section 33 is gradually increased along a flow direction of the target air flow, and when a first air flow of the target air flows through the air inlet shrinkage section 31, the throat section 32 and the air outlet diffusion section 33, shrinkage and diffusion are performed to form an accelerated jet flow of the target air.
It should be noted that, when the gas flows in the laval tube, the dynamic pressure reaches a maximum value and the static pressure reaches a minimum value in the throat section 32, the speed of the target gas increases due to the decrease of the cross-sectional area of the through flow, and the whole surge flow is subjected to the pipeline shrinking process in the same time, so that the pressure is also reduced at the same time, and a pressure difference is generated, at the same time, the laval tube converts the fluid heat energy into kinetic energy, so as to form an accelerated jet with high molecular concentration and small air flow cross-sectional area into the vacuum ultraviolet light source irradiation area c, wherein, a person skilled in the art can adjust the size of the laval tube according to the required speed of the accelerated jet so that the accelerated jet of the target gas enters the vacuum ultraviolet light source irradiation area c at a proper speed.
In one embodiment, the aerodynamic lens tube is integrally formed with the Laval tube.
In one embodiment, the acoustic wave driving module 5 firstly emits an acoustic wave with a predetermined parameter to generate a standing wave, and then applies a voltage with the predetermined parameter to the surface of the acoustic wave driving module 5 to generate a guiding electric field. Specifically, the intensity of the sound wave is about 0.0001-0.1W/m 2 The frequency of the sound wave is about 30-40 MHz, the bottom of the sound wave driving module 5 is a metal conductive disc, a voltage is applied to the metal conductive disc to form a guiding electric field, the voltage can be-5V to-50V, the direction of the guiding electric field is vertical to the surface of the disc, and of course, the parameters can be adjusted based on the speed of the target gas flowing into the irradiation area of the vacuum ultraviolet light source.
In one embodiment, the acoustic wave driving module 5 emits an acoustic wave with a predetermined parameter to generate a standing wave, and simultaneously applies a voltage with the predetermined parameter to the surface of the acoustic wave driving module 5 to generate a guiding electric field.
In one embodiment, after the target ions leave the vacuum ultraviolet irradiation source region, the target ions are focused by the first focusing electrode set and accelerated into the mass analysis module 7 for analysis, and then focused by the second focusing electrode set and accelerated into the ion detection module for acquiring mass spectrum information.
In one embodiment, the first mass analysis module 7 is one of a time-of-flight mass spectrum, a quadrupole mass spectrum, and an ion trap mass spectrum.
Fig. 3 illustrates a schematic structural diagram of a mass spectrometry detection device for volatile organic compounds according to a third embodiment of the present invention, and as shown in fig. 3, the electronic device 500 may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a method of mass spectrometry detection of a volatile organic compound according to the present invention, the method comprising:
receiving target gas provided by a sample injection module 1, wherein the target gas is a volatile organic compound;
focusing and organizing the target gas through a first aerodynamic structure to form a first gas flow of the target gas;
the first airflow of the target gas is contracted and expanded through the second aerodynamic structure to form an accelerated jet of the target gas, and the accelerated jet enters a vacuum ultraviolet light source irradiation area c;
the sound wave driving module 5 generates standing waves, so that the accelerated jet of the target gas is limited in the irradiation area c of the vacuum ultraviolet light source to carry out continuous ionization, and target ions and target gas which is not completely ionized are obtained;
The standing wave controls the target gas which is not completely ionized to be ionized continuously in the irradiation area c of the vacuum ultraviolet light source, and target ions are continuously obtained;
the acoustic wave driving module 5 generates a guiding electric field to guide the target ions to leave the irradiation area c of the vacuum ultraviolet light source and accelerate to enter the mass analysis module 7 for mass analysis;
and the target ions after passing through the mass analysis module enter the ion detection module to obtain a mass spectrum detection result.
Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the volatile organic compound based mass spectrometry detection method provided in the above embodiments, the method comprising:
receiving target gas provided by a sample injection module 1, wherein the target gas is a volatile organic compound;
focusing and organizing the target gas through a first aerodynamic structure to form a first gas flow of the target gas;
the first airflow of the target gas is contracted and expanded through the second aerodynamic structure to form an accelerated jet flow of the target gas, and the accelerated jet flow of the target gas enters a vacuum ultraviolet light source irradiation area c for ionization;
the sound wave driving module 5 generates a standing wave, the standing wave limits the accelerating jet flow of the target gas to be positioned in the vacuum ultraviolet light source irradiation area c for continuous ionization to obtain target ions and target gas which is not ionized completely, and the standing wave also controls the target gas which is not ionized completely to be ionized continuously in the vacuum ultraviolet light source irradiation area c for continuous ionization to obtain target ions;
The guiding electric field generated by the acoustic wave driving module 5 guides the target ions to accelerate to leave the irradiation area c of the vacuum ultraviolet light source and enter the mass analysis module 7 for mass analysis;
the target ions after passing through the mass analysis module 7 enter an ion detection module to obtain a mass spectrum detection result.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
The mass spectrum detection method and the mass spectrum detection system for the volatile organic compounds can overcome the problems that target gas in a vacuum environment is slow in diffusion and not concentrated in molecular weight, and VOCs are obviously dispersed in the vacuum environment to cause molecular loss before ionization, so that the quick and efficient ionization of the VOCs is realized, the sensitivity and the response speed of the detection of the VOCs are greatly improved, and the method and the system have important significance for improving the capability of environmental monitoring and pollution control.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for mass spectrometry detection of volatile organic compounds, the method comprising:
receiving target gas provided by a sample injection module, wherein the target gas is a volatile organic compound;
Focusing and organizing the target gas through a first aerodynamic structure to form a first gas flow of the target gas;
the first airflow of the target gas is contracted and expanded through the second aerodynamic structure to form an accelerated jet flow of the target gas, and the accelerated jet flow of the target gas enters a vacuum ultraviolet light source irradiation area for ionization;
the sound wave driving module generates a standing wave, the standing wave limits the accelerated jet flow of the target gas to be located in the irradiation area of the vacuum ultraviolet light source for continuous ionization, and target ions and target gas which is not ionized completely are obtained;
the standing wave also controls the target gas which is not completely ionized to be ionized continuously in the irradiation area of the vacuum ultraviolet light source, and target ions are continuously obtained;
the sound wave driving module generates a guiding electric field to guide the target ions to accelerate to leave the irradiation area of the vacuum ultraviolet light source and enter the mass analysis module for mass analysis;
and the target ions after passing through the mass analysis module enter the ion detection module to obtain a mass spectrum detection result.
2. The method for mass spectrometry detection of a volatile organic compound according to claim 1, wherein:
the central axes of the inlet and outlet of the first aerodynamic structure and the second aerodynamic structure are the same central axis.
3. The method for mass spectrometry detection of a volatile organic compound according to claim 2, characterized in that:
the first aerodynamic structure is an aerodynamic lens tube, the aerodynamic lens tube comprises a cylindrical pipeline and a first flow guide ring and a second flow guide ring in the cylindrical pipeline, the first flow guide ring and the second flow guide ring are sequentially arranged in the cylindrical pipeline according to the flow direction of target gas at preset intervals, the central axis of the first flow guide ring and the central axis of the second flow guide ring are the same central axis, the cylindrical pipeline is matched with the first flow guide ring and the second flow guide ring to form a flow guide air passage in the cylindrical pipeline, and the target gas flows through the flow guide air passage to be focused and organized to form a first air flow of the target gas.
4. A method for mass spectrometry detection of a volatile organic compound according to claim 3, wherein: the first diversion ring comprises an inflow side and an outflow side, the through-flow cross-sectional area of the first diversion ring gradually decreases from the inflow side to the outflow side, the second diversion ring comprises an inflow side and an outflow side, and the through-flow cross-sectional area of the second diversion ring gradually decreases from the inflow side to the outflow side.
5. The method for mass spectrometry detection of a volatile organic compound according to claim 1, wherein: the second aerodynamic structure is specifically a Laval pipe, the Laval pipe comprises an air inlet shrinkage section, a throat section and an air outlet diffusion section which are sequentially communicated, the inlet of the air inlet shrinkage section is further communicated with the first aerodynamic structure, the outlet of the air outlet diffusion section is communicated with the vacuum ultraviolet light source irradiation area, the through flow cross section area of the air inlet shrinkage section is gradually reduced along the flow direction of target air flow, the through flow cross section area of the air outlet diffusion section is gradually increased along the flow direction of target air, and the first air flow of the target air is shrunk and diffused to form accelerated jet flow of the target air when flowing through the air inlet shrinkage section, the throat section and the air outlet diffusion section.
6. The method according to claim 1, wherein the acoustic wave driving module emits an acoustic wave of a predetermined parameter to generate a standing wave, and then applies a voltage of the predetermined parameter to a surface of the acoustic wave driving module to generate a guiding electric field.
7. The method according to claim 1, wherein the acoustic wave driving module emits an acoustic wave of a predetermined parameter to generate a standing wave, and a voltage of the predetermined parameter is applied to a surface of the acoustic wave driving module to generate a guiding electric field.
8. The method according to claim 1, wherein after the target ions leave the vacuum ultraviolet irradiation source region, the target ions are focused by the first focusing electrode set and accelerated into the mass analysis module for analysis, and then focused by the second focusing electrode set and accelerated into the ion detection module for obtaining mass spectrum information.
9. A mass spectrometry detection system for volatile organic compounds, comprising:
the sample injection module is used for providing target gas which is a volatile organic compound;
a first aerodynamic module for focusing and organizing the target gas into a first gas flow of the target gas;
the second aerodynamic module is used for contracting and expanding the first airflow of the target gas to form an accelerated jet of the target gas; the vacuum ultraviolet light source irradiation module is used for providing vacuum ionization environment and ultraviolet light for ionization;
the sound wave driving module is used for generating a standing wave and a guiding electric field, the standing wave enables the accelerated jet flow of the target gas to be limited in the irradiation area of the vacuum ultraviolet light source for continuous ionization so as to obtain target ions and target gas which is not ionized completely, and the guiding electric field guides the target ions to leave the irradiation area of the vacuum ultraviolet light source;
The mass analysis module is used for carrying out mass analysis on the target ions;
and the ion detection module is used for acquiring a mass spectrum detection result of the target ion.
10. A mass spectrometry detection apparatus for a volatile organic compound comprising a memory and a processor, the memory storing a computer program, characterized in that the processor when executing the computer program implements the mass spectrometry detection method for a volatile organic compound according to any one of claims 1 to 8.
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