CN112782262A - Device and method for improving vacuum efficiency of portable mass spectrometer - Google Patents
Device and method for improving vacuum efficiency of portable mass spectrometer Download PDFInfo
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- CN112782262A CN112782262A CN202011387064.3A CN202011387064A CN112782262A CN 112782262 A CN112782262 A CN 112782262A CN 202011387064 A CN202011387064 A CN 202011387064A CN 112782262 A CN112782262 A CN 112782262A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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Abstract
The invention discloses a device and a method for improving vacuum efficiency of a portable mass spectrometer, wherein the device comprises: metal tee bend (1), vacuum pump (2), gas steel bottle (3) and mass spectrometer cavity (4), be connected through metal pipeline and vacuum line control valve (6) between metal tee bend (1) and vacuum pump (2), metal tee bend (1) with connect through metal pipeline and relief pressure valve (7) between gas steel bottle (3), be connected through metal pipeline and main valve (5) between metal tee bend (1) and mass spectrometer cavity (4). According to the embodiment of the invention, the dry inert gas is adopted to carry out positive pressure protection on the inner cavity of the portable mass spectrometer, so that the invasion and condensation of moisture in the air are greatly reduced; the auxiliary vacuum device is connected to the outside, so that the vacuum efficiency is remarkably improved.
Description
Technical Field
The invention relates to the technical field of field tests of electrical equipment, in particular to a device and a method for improving vacuum efficiency of a portable mass spectrometer.
Background
The mass spectrometry is an analysis method which ionizes a sample by using a mass spectrometer and separates the sample according to the mass-to-charge ratio to obtain the mass number and the intensity information of an object to be detected, and is a universal method which has high sensitivity, good specificity and high response speed in a plurality of modern analysis and test technologies. Mass spectrometry has become a tool for component analysis in the fields of nuclear physics, chemistry, biology, medicine, and the environment, etc., with its ability to obtain mass information about molecules. The portable mass spectrometry technology has the technical characteristics of in-situ, real-time, online, non-destructive, high-flux, high sensitivity, high selectivity and low loss, and is gradually popularized and applied to field detection, field diagnosis, process monitoring, emission detection and control and emergency treatment of various field environments in recent years, particularly in the aspects of clinical medicine, safety inspection and the like.
Vacuum is an important performance indicator of mass spectrometers and affects the resolution and sensitivity of the mass spectrometer. On one hand, the pumping speed of the vacuum system adopted by the portable mass spectrometer is one tenth of that of the conventional mass spectrometer in a laboratory due to volume limitation, so that the time for the system to reach the preset vacuum degree after being restarted is increased; on the other hand, in the long-distance transportation and long-time stop operation process of the vacuum system of the portable mass spectrometer, air, especially moisture in the air can inevitably permeate into the system, and the moisture is difficult to be pumped away by the vacuum system due to easy adsorption on the inner wall of the metal cavity, so that the time consumption of the vacuum system of the mass spectrometer is further increased.
The design of the traditional vacuum system influences the time consumption and the field working efficiency of the portable mass spectrometer for reaching the preset vacuum degree, and causes the insufficient field applicability of the portable mass spectrometry technology.
Disclosure of Invention
The invention provides a device and a method for improving the vacuum efficiency of a portable mass spectrometer on the basis of ensuring the portability of the mass spectrometer in order to overcome the defect of the existing vacuum technology of the portable mass spectrometer in efficiency.
The embodiment of the invention provides a device for improving vacuum efficiency of a portable mass spectrometer, which comprises: metal tee bend (1), vacuum pump (2), gas steel bottle (3) and mass spectrograph cavity (4), wherein:
the metal tee joint (1) is a hollow pipeline, and the metal tee joint (1) realizes the gas circuit connection of a mass spectrometer cavity (4) with a vacuum pump (2) and a gas steel cylinder (3);
the vacuum pump (2) is an oil-free vacuum pump, and the vacuum pump (2) is connected to a mass spectrometer cavity (4) based on the metal tee joint (1);
the gas steel cylinder (3) is used for storing high-pressure dry inert gas, the gas steel cylinder (3) is provided with a pressure reducing valve (7), and the pressure reducing valve (7) is used for regulating and reducing the pressure of the high-pressure dry inert gas in the gas steel cylinder (3) and controlling the output;
the mass spectrometer cavity (4) is a main body part of the mass spectrometer and is used for ionization of a sample, transmission of ions, separation and detection;
the metal tee joint (1) is connected with the vacuum pump (2) through a metal pipeline and a vacuum pipeline control valve (6), the metal tee joint (1) is connected with the gas steel cylinder (3) through a metal pipeline and a pressure reducing valve (7), and the metal tee joint (1) is connected with the mass spectrometer cavity (4) through a metal pipeline and a main valve (5);
the main valve (5) is used for controlling the opening and closing of a pipeline connected with the mass spectrometer cavity (4); the vacuum pipeline control valve (6) is used for controlling the opening and closing of an air inlet pipeline of the vacuum pump (2).
The gas steel cylinder (3) is provided with an inflation valve (8), and the inflation valve (8) is used for supplementing high-pressure dry inert gas into the gas steel cylinder (3).
The metal tee joint (1) is a hollow stainless steel pipeline.
The main valve (5) is a ball valve.
The vacuum pipeline control valve (6) is a ball valve.
Correspondingly, the embodiment of the invention also provides a control method based on the device for improving the vacuum efficiency of the portable mass spectrometer, when the vacuum system of the mass spectrometer is restarted, the vacuum pump (2) is used for vacuumizing the cavity (4) of the mass spectrometer, and the control process method comprises the following steps:
closing the pressure reducing valve (7), opening the vacuum pump (2), and then sequentially opening the vacuum pipeline control valve (6) and the main valve (5) to vacuumize the pipeline and the mass spectrometer cavity (4);
after the absolute pressure of the mass spectrometer cavity (4) is reduced to 1kPa, the vacuum pipeline control valve (6) is closed, the vacuum pump (2) is closed, the pressure reducing valve (7) is slowly opened, and the pressure reducing valve (7) is closed after dry inert gas is filled into the mass spectrometer cavity (4) until the absolute pressure reaches 150 kPa.
Correspondingly, the embodiment of the invention also provides a control method based on the device for improving the vacuum efficiency of the portable mass spectrometer, which is characterized in that when the vacuum system of the mass spectrometer is restarted, the vacuum pump (2) is used for vacuumizing the cavity (4) of the mass spectrometer, and the control process method comprises the following steps: the pressure reducing valve (7) keeps a closed state, and after the vacuum pump (2) is started, the vacuum pipeline control valve (6) and the main valve (5) are sequentially started to vacuumize the pipeline and the mass spectrometer cavity (4);
and after the absolute pressure of the mass spectrometer cavity (4) is reduced to 0.3kPa, the vacuum pipeline control valve (6), the main valve (5) and the vacuum pump (2) are closed in sequence.
Compared with the prior art, the embodiment of the invention has the advantages that:
1. the inner cavity of the portable mass spectrometer is protected by positive pressure by adopting dry inert gas, so that the invasion and condensation of moisture in the air are greatly reduced;
2. the auxiliary vacuum device is connected to the outside, so that the vacuum efficiency is remarkably improved;
3. the dry inert gas is easily pumped away by a vacuum system, and the time for the portable mass spectrometer to reach the preset vacuum degree is obviously reduced;
4. after the portable mass spectrometer reaches the preset vacuum degree, the device can be disconnected with the mass spectrometer, and the portable use of the mass spectrometer is not influenced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an apparatus for improving vacuum efficiency of a portable mass spectrometer in an embodiment of the present invention;
in the figure, a metal tee joint 1, a vacuum pump 2, a gas steel cylinder 3, a mass spectrometer cavity 4, a main valve 5, a vacuum pipeline control valve 6, a pressure reducing valve 7 and a gas charging valve 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the invention belongs to the technical field of mass spectrometry, and particularly relates to a device and a method for improving vacuum efficiency of a portable mass spectrometer. The invention provides a reliable technical method for improving the field working efficiency and the applicability of the portable mass spectrometer by positive pressure protection of dry inert gas and external access of an auxiliary vacuum device.
The embodiment of the invention discloses a device and a method for improving vacuum efficiency of a portable mass spectrometer. When the mass spectrometer vacuum system stops running, a dry inert gas positive pressure protection method is adopted to reduce the infiltration of moisture in the air; when the mass spectrometer vacuum system restarts, through the outside access vacuum pump, improve vacuum efficiency to it reaches the consuming time of predetermineeing the vacuum degree to reduce the system.
The invention effectively improves the field working efficiency of the portable mass spectrometer when the vacuum system is started after being stopped for a long time.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a device for improving vacuum efficiency of a portable mass spectrometer in an embodiment of the present invention, and the device for improving vacuum efficiency of a portable mass spectrometer provided in the embodiment of the present invention is composed of a metal tee (1), a vacuum pump (2), a gas steel cylinder (3), and a mass spectrometer cavity (4).
The structure and function of the components of the device for improving the vacuum efficiency of the portable mass spectrometer are as follows:
the metal tee joint (1) is a hollow stainless steel pipeline and has the function that a mass spectrometer cavity (4) is connected with the gas circuits of the vacuum pump (2) and the gas steel cylinder (3);
the vacuum pump (2) is an oil-free vacuum pump, the maximum pumping speed is not lower than 20L/min, and the vacuum pump has the function of being externally connected into a cavity of the mass spectrometer, so that the vacuum pumping efficiency of the mass spectrometer is improved;
the gas steel cylinder (3) is used for storing high-pressure dry inert gas; the gas steel cylinder (3) is provided with a pressure reducing valve (7) and an inflation valve (8), wherein the pressure reducing valve (7) is used for regulating and controlling the pressure of the high-pressure dry inert gas in the gas steel cylinder (3) and outputting the high-pressure dry inert gas, and the inflation valve (8) is used for supplementing the high-pressure dry inert gas into the gas steel cylinder (3);
the mass spectrometer cavity (4) is a main body part of the mass spectrometer and is used for ionization of a sample, transmission, separation and detection of ions;
the main valve (5) is a ball valve and is used for controlling the opening and closing of a pipeline connected with the mass spectrometer cavity (4);
the vacuum pipeline control valve (6) is a ball valve and is used for controlling the opening and closing of an air inlet pipeline of the vacuum pump (2);
the connection relation of all parts of the device for improving the vacuum efficiency of the portable mass spectrometer is as follows:
the metal tee joint (1) is connected with the vacuum pump (2) through a metal pipeline and a vacuum pipeline control valve (6), the metal tee joint (1) is connected with the gas steel cylinder (3) through a metal pipeline and a pressure reducing valve (7), and the metal tee joint (1) is connected with the mass spectrometer cavity (4) through a metal pipeline and a main valve (5).
According to the method for controlling the device for improving the vacuum efficiency of the portable mass spectrometer, when the vacuum system of the mass spectrometer stops running, dry inert gas is filled into the cavity (4) of the mass spectrometer through the gas steel cylinder (3) for positive pressure protection, and the invasion of moisture in the air is prevented.
The specific control process is as follows:
closing the pressure reducing valve (7), opening the vacuum pump (2), and then sequentially opening the vacuum pipeline control valve (6) and the main valve (5) to vacuumize the pipeline and the mass spectrometer cavity (4);
after the absolute pressure of the mass spectrometer cavity (4) is reduced to 1kPa, the vacuum pipeline control valve (6) is closed, the vacuum pump (2) is closed, the pressure reducing valve (7) is slowly opened, and the pressure reducing valve (7) is closed after dry inert gas is filled into the mass spectrometer cavity (4) until the absolute pressure reaches 150 kPa.
According to the method for controlling the device for improving the vacuum efficiency of the portable mass spectrometer, when the vacuum system of the mass spectrometer is restarted, the vacuum pump (2) is used for vacuumizing the cavity (4) of the mass spectrometer, so that the vacuumizing efficiency of the vacuum system of the mass spectrometer is improved.
The specific control process is as follows:
the pressure reducing valve (7) keeps a closed state, and after the vacuum pump (2) is started, the vacuum pipeline control valve (6) and the main valve (5) are sequentially started to vacuumize the pipeline and the mass spectrometer cavity (4);
and after the absolute pressure of the mass spectrometer cavity (4) is reduced to 0.3kPa, the vacuum pipeline control valve (6), the main valve (5) and the vacuum pump (2) are closed in sequence.
Example two
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a device for improving vacuum efficiency of a portable mass spectrometer in an embodiment of the present invention, which is composed of a metal tee 1, a vacuum pump 2, a gas cylinder 3, and a mass spectrometer cavity 4.
The metal tee joint 1 is a hollow stainless steel pipeline and is used for connecting a mass spectrometer cavity 4 with a vacuum pump 2 and a gas circuit of a gas steel cylinder 3; the vacuum pump 2 is an oil-free vacuum pump, the maximum pumping speed is not lower than 20L/min, and the vacuum pump is used for being connected into a cavity of the mass spectrometer from the outside to improve the vacuum pumping efficiency of the mass spectrometer;
the gas steel cylinder 3 is used for storing high-pressure dry inert gas; the pressure reducing valve 7 is used for adjusting the pressure of the high-pressure dry inert gas in the gas steel cylinder 3 and controlling the output, and the charging valve 8 is used for supplementing the high-pressure dry inert gas to the gas steel cylinder 3; the mass spectrometer chamber 4 is the main body part of the mass spectrometer and is used for ionization of samples, transmission, separation and detection of ions; the main valve 5 is a ball valve and is used for controlling the opening and closing of a pipeline connected with the mass spectrometer cavity 4; the vacuum pipeline control valve 6 is a ball valve and is used for controlling the opening and closing of an air inlet pipeline of the vacuum pump 2; the metal tee joint 1 is connected with the vacuum pump 2 through a metal pipeline and a vacuum pipeline control valve 6, the metal tee joint 1 is connected with the gas steel cylinder 3 through a metal pipeline and a pressure reducing valve 7, and the metal tee joint 1 is connected with the mass spectrometer cavity 4 through a metal pipeline and a main valve 5.
Adopt foretell device of portable mass spectrometer vacuum efficiency of improvement, when mass spectrometer vacuum system stopped operation, fill into dry inert gas through gas cylinder 3 to mass spectrometer cavity 4 and carry out the malleation protection, prevent the invasion of moisture in the air.
Adopt foretell device of portable mass spectrometer vacuum efficiency of improvement, when mass spectrometer vacuum system restarts, through vacuum pump 2 to 4 evacuation of mass spectrometer cavity, improve mass spectrometer vacuum system's evacuation efficiency.
When the invention is implemented:
for a portable mass spectrometer with the internal cavity volume of about 3L, the vacuum system of the mass spectrometer consists of a pre-stage diaphragm pump with the maximum pumping speed of 5L/min and a turbo molecular pump with the maximum pumping speed of 80L/s. The internal pressure of the mass analyser was 3 x 10-4Pa before the portable mass spectrometer vacuum system was switched off.
After the portable mass spectrometer vacuum system is closed for 20 minutes, the pressure reducing valve 7 is closed, the vacuum pump 2 is opened, then the vacuum pipeline control valve 6 and the main valve 5 are sequentially opened, and the pipeline and the mass spectrometer cavity 4 are vacuumized; after the absolute pressure of the mass spectrometer cavity 4 is reduced to 1kPa, the vacuum pipeline control valve 6 is closed, the vacuum pump 2 is closed, the pressure reducing valve 7 is slowly opened, and the pressure reducing valve 7 is closed after dry inert gas is filled into the mass spectrometer cavity 4 until the absolute pressure reaches 150 kPa.
The portable mass spectrometer vacuum system is restarted after being closed for 24 hours, the pressure reducing valve 7 is kept in a closed state at the moment, and after the vacuum pump 2 is started, the vacuum pipeline control valve 6 and the main valve 5 are sequentially started to vacuumize the pipeline and the mass spectrometer cavity 4;
after the portable mass spectrometer vacuum system is restarted for 5 minutes, the absolute pressure of the mass spectrometer cavity 4 is reduced to 0.3kPa, at the moment, the vacuum pipeline control valve 6 and the main valve 5 are closed in sequence, and finally the vacuum pump 2 is closed. The turbomolecular pump of the portable mass spectrometer was started and the internal pressure of the mass analyzer was reduced to the pressure before the vacuum system was shut down after about 30 minutes.
In contrast, the apparatus and method for improving vacuum efficiency of a portable mass spectrometer according to the present invention were not used. The internal pressure of the mass analyser was 3 x 10 before the portable mass spectrometer vacuum system was switched off-4Pa. The portable mass spectrometer vacuum system is restarted after being closed for 24 hours, and the absolute pressure of the portable mass spectrometer mass analyzer is reduced to 0.3kPa after about 20 minutes; at this point the turbomolecular pump of the portable mass spectrometer was started and after about 5 hours the internal pressure of the mass analyser was reduced to the pressure before the vacuum system was shut down.
In the comparison embodiment, the device and the method for improving the vacuum efficiency of the portable mass spectrometer are used, the portable mass spectrometer vacuum system is restarted after being closed for 24 hours, the time for the portable mass spectrometer to reach the preset vacuum degree is reduced from 5 hours to 0.5 hour, and the vacuum efficiency is remarkably improved.
The above embodiments of the present invention are described in detail, and the principle and the implementation manner of the present invention should be described herein by using specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. An apparatus for improving vacuum efficiency of a portable mass spectrometer, the apparatus comprising: metal tee bend (1), vacuum pump (2), gas steel bottle (3) and mass spectrograph cavity (4), wherein:
the metal tee joint (1) is a hollow pipeline, and the metal tee joint (1) realizes the gas circuit connection of a mass spectrometer cavity (4) with a vacuum pump (2) and a gas steel cylinder (3);
the vacuum pump (2) is an oil-free vacuum pump, and the vacuum pump (2) is connected to a mass spectrometer cavity (4) based on the metal tee joint (1);
the gas steel cylinder (3) is used for storing high-pressure dry inert gas, the gas steel cylinder (3) is provided with a pressure reducing valve (7), and the pressure reducing valve (7) is used for regulating and reducing the pressure of the high-pressure dry inert gas in the gas steel cylinder (3) and controlling the output;
the mass spectrometer cavity (4) is a main body part of the mass spectrometer and is used for ionization of a sample, transmission of ions, separation and detection;
the metal tee joint (1) is connected with the vacuum pump (2) through a metal pipeline and a vacuum pipeline control valve (6), the metal tee joint (1) is connected with the gas steel cylinder (3) through a metal pipeline and a pressure reducing valve (7), and the metal tee joint (1) is connected with the mass spectrometer cavity (4) through a metal pipeline and a main valve (5);
the main valve (5) is used for controlling the opening and closing of a pipeline connected with the mass spectrometer cavity (4); the vacuum pipeline control valve (6) is used for controlling the opening and closing of an air inlet pipeline of the vacuum pump (2).
2. The apparatus for improving vacuum efficiency of a portable mass spectrometer as claimed in claim 1, wherein the gas cylinder (3) is provided with a gas filling valve (8), the gas filling valve (8) is used for supplementing high pressure dry inert gas into the gas cylinder (3).
3. The device for improving the vacuum efficiency of the portable mass spectrometer as claimed in claim 1, wherein the metal tee (1) is a hollow stainless steel pipe.
4. The apparatus for improving vacuum efficiency of a portable mass spectrometer as claimed in claim 1, wherein said main valve (5) is a ball valve.
5. The apparatus for improving vacuum efficiency of a portable mass spectrometer as claimed in claim 1, wherein the vacuum line control valve (6) is a ball valve.
6. A control method of the device for improving vacuum efficiency of the portable mass spectrometer is characterized in that when the vacuum system of the mass spectrometer is restarted, the vacuum pump (2) is used for vacuumizing the cavity (4) of the mass spectrometer, and the control method comprises the following steps:
closing the pressure reducing valve (7), opening the vacuum pump (2), and then sequentially opening the vacuum pipeline control valve (6) and the main valve (5) to vacuumize the pipeline and the mass spectrometer cavity (4);
after the absolute pressure of the mass spectrometer cavity (4) is reduced to 1kPa, the vacuum pipeline control valve (6) is closed, the vacuum pump (2) is closed, the pressure reducing valve (7) is slowly opened, and the pressure reducing valve (7) is closed after dry inert gas is filled into the mass spectrometer cavity (4) until the absolute pressure reaches 150 kPa.
7. A control method of the device for improving vacuum efficiency of the portable mass spectrometer is characterized in that when the vacuum system of the mass spectrometer is restarted, the vacuum pump (2) is used for vacuumizing the cavity (4) of the mass spectrometer, and the control method comprises the following steps: the pressure reducing valve (7) keeps a closed state, and after the vacuum pump (2) is started, the vacuum pipeline control valve (6) and the main valve (5) are sequentially started to vacuumize the pipeline and the mass spectrometer cavity (4);
and after the absolute pressure of the mass spectrometer cavity (4) is reduced to 0.3kPa, the vacuum pipeline control valve (6), the main valve (5) and the vacuum pump (2) are closed in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011387064.3A CN112782262A (en) | 2020-12-01 | 2020-12-01 | Device and method for improving vacuum efficiency of portable mass spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011387064.3A CN112782262A (en) | 2020-12-01 | 2020-12-01 | Device and method for improving vacuum efficiency of portable mass spectrometer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201262602Y (en) * | 2008-09-12 | 2009-06-24 | 北京圣涛平试验工程技术研究院有限责任公司 | Apparatus for sampling mass spectrometer gas |
| CN203707077U (en) * | 2014-02-14 | 2014-07-09 | 北京北分瑞利分析仪器(集团)有限责任公司 | Novel portable mass spectrum vacuum system |
| CN106298431A (en) * | 2016-09-21 | 2017-01-04 | 北京雪迪龙科技股份有限公司 | The power-off protection apparatus of a kind of on-line mass spectroscopy detection and method |
| CN108195923A (en) * | 2018-01-02 | 2018-06-22 | 清华大学深圳研究生院 | The method and mass spectrometer arrangement detected for volatile organic compounds in sample |
-
2020
- 2020-12-01 CN CN202011387064.3A patent/CN112782262A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201262602Y (en) * | 2008-09-12 | 2009-06-24 | 北京圣涛平试验工程技术研究院有限责任公司 | Apparatus for sampling mass spectrometer gas |
| CN203707077U (en) * | 2014-02-14 | 2014-07-09 | 北京北分瑞利分析仪器(集团)有限责任公司 | Novel portable mass spectrum vacuum system |
| CN106298431A (en) * | 2016-09-21 | 2017-01-04 | 北京雪迪龙科技股份有限公司 | The power-off protection apparatus of a kind of on-line mass spectroscopy detection and method |
| CN108195923A (en) * | 2018-01-02 | 2018-06-22 | 清华大学深圳研究生院 | The method and mass spectrometer arrangement detected for volatile organic compounds in sample |
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