CN112162053A - Analysis instrument and method for multi-component volatile organic compound and application - Google Patents
Analysis instrument and method for multi-component volatile organic compound and application Download PDFInfo
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- CN112162053A CN112162053A CN202011104343.4A CN202011104343A CN112162053A CN 112162053 A CN112162053 A CN 112162053A CN 202011104343 A CN202011104343 A CN 202011104343A CN 112162053 A CN112162053 A CN 112162053A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
- G01N2030/201—Injection using a sampling valve multiport valves, i.e. having more than two ports
Abstract
The invention discloses an analytical instrument and method for multi-component volatile organic compounds. According to the invention, the components to be analyzed of the multi-component gas are divided into two groups according to the carbon content for analysis, chromatographic columns which are independently suitable for the light component and the heavy component are selected, the analysis of the light component and the heavy component has no interference with each other, and when the light component is analyzed, the heavy component is concentrated and preferentially appears, so that the heavy component is prevented from staying in a light component separation column, and the analysis efficiency is improved; according to the invention, two paths of analysis samples generated by single sample injection can be analyzed simultaneously, so that the consistency of the conditions of light and heavy components in sample analysis is ensured, the flow of the sample is stable in the analysis process, flow compensation is not needed, the sensitivity of a detector is not affected, the analysis time is reduced, and the stability and the repeatability of analysis are improved. The invention selects different combinations of the separation columns and the detectors, has wide application range and is particularly suitable for the analysis and application of VOCs standard gas used for environmental monitoring.
Description
Technical Field
The invention relates to the field of instrument analysis, in particular to an analyzer and a method for multi-component volatile organic compounds and application of the analyzer.
Background
In the technical field of environmental monitoring and analysis, monitoring of Volatile Organic Compounds (VOCs) in air or exhaust gas is becoming more and more strict, and current monitoring objects include alkanes, alkenes, aromatic hydrocarbons, oxygen-containing volatile organic compounds, halogenated hydrocarbons and the like. In the current monitoring standard, 57 volatile organic compounds of the original PAMS substance are always the key monitoring objects. PAMS refers primarily to ozone precursors, including C2-C12 hydrocarbons.
For the analysis of such multiple components, especially 57 or more components, the currently used single chromatographic column cannot completely and effectively separate the components at one time, and partial peak patterns overlap to further influence the accuracy of the analysis. In the prior art, the components are divided into a light component and a heavy component according to the carbon content, and two sets of analysis devices are respectively adopted for analysis, however, because the components are more, in the analysis of the light component, in order to ensure the separation effect, the single analysis time of a complete sample is too long and can reach hours, the heavy components on an individual chromatographic column can not be desorbed even, and the subsequent test result is influenced, and meanwhile, the analysis stability and the repeatability are poor due to the fact that two samples are fed independently. In order to overcome the problem, an improved scheme appears in the prior art, in which the sample gas is divided into components with different carbon contents through center cutting, and then the components enter different chromatographic columns and detectors for analysis respectively. However, the center cutting has the following disadvantages in practical application: the time of chromatogram peak is drift irregularly, the sensitivity of the detector is reduced due to flow compensation, and the cost of the accessory required by center cutting is high, so that the detection cost is increased.
In the prior art, a concentrator is combined with a chromatograph, VOCs (volatile organic compounds) multi-component gas with low content is concentrated by the concentrator and then enters the chromatograph for analysis, and the detection limit is reduced by a method for increasing the concentration so as to be beneficial to detection and separation, but the following problems exist in practical application: on the one hand, the concentrator is expensive and complicated to operate due to the equipment such as liquid nitrogen, and on the other hand, the method does not really solve the problem of incomplete separation between components.
In addition, the three methods have the problems of poor stability and poor repeatability when used, and may be barely applicable to common detection and analysis work, but cannot be applicable to analysis of the standard gas related to the VOCs for detection, analysis and calibration due to large deviation and poor repeatability.
Disclosure of Invention
The invention aims to provide an analyzer and a method for multi-component volatile organic compounds, which realize complete separation of light recombination and improve the efficiency and accuracy of detecting the multi-component volatile organic compounds; another objective of the present invention is to provide an application of the method for analyzing multi-component volatile organic compounds, which is suitable for analyzing the standard gas related to VOCs.
The technical scheme of the invention is as follows:
an apparatus for analyzing multiple component volatile organic compounds, comprising:
the ten-way valve is connected with a sample gas to be analyzed, the ten-way valve is connected with two quantitative rings, and each quantitative ring is matched with the carrier gas path to form a first analysis passage and a second analysis passage which are independent;
the first detector is connected with the first analysis passage, a six-way valve, a pre-separation column for primarily separating the sample gas and a first separation column for completely and effectively separating a certain number of target components preferentially passing through the pre-separation column are arranged in the first analysis passage, a pipeline connected with the ten-way valve is sequentially connected in series through the six-way valve, the pre-separation column, the six-way valve, the first separation column, the six-way valve and the first detector to form a sample feeding route a, back flushing can be realized through the valve switching of the six-way valve, and a sample feeding pipeline is sequentially connected in series through the six-way valve, the first separation column, the six-way valve, the pre-separation column, the six-way valve and the first detector to form a sample feeding route b during back flushing;
and a second detector connected to the second analysis path, wherein a second separation column capable of separating at least a component of the target component of the sample gas analysis from the components of the target component of the sample gas analysis, excluding the component that has been separated by the first separation column, is disposed in front of the second detector.
According to an embodiment of the apparatus for analyzing multiple component volatile organic compounds, the first detector is a FID detector, and the second detector is a mass spectrometer or FID detector.
According to a specific embodiment of the apparatus for analyzing a multi-component volatile organic compound of the present invention, a switching valve is connected between the ten-way valve and the sample gas, and the switching valve can switch different gas cylinders.
The invention also comprises a multi-component volatile organic compound analysis method, and an analysis instrument using the multi-component volatile organic compound analysis method comprises the following steps:
s1, adjusting the on-off state of the ten-way valve, serially connecting the sample gas, the ten-way valve and the quantitative rings, and filling the quantitative rings with the sample gas after stabilizing for a certain time;
s2, adjusting the on-off state of the ten-way valve to enable each quantitative ring to be communicated with the corresponding carrier gas path to form two independent analysis paths;
s3, the carrier gas carries the sample gas to enter a first analysis passage to be injected according to a sample injection route a, the sample gas is pre-separated firstly, and along the direction of the sample injection route a, when only target components of C2-Cx are all located on a gas passage formed by the six-way valve, the first separation column and the six-way valve, the six-way valve is switched to carry out back flushing, and the sample enters the first detector to be analyzed through a sample injection route b;
and S4, the carrier gas carries the sample gas into a second analysis channel, the target components at least containing more than x carbon are separated by the second separation column, and the target components enter the second detector for analysis.
According to a specific embodiment of the method for analyzing the multi-component volatile organic compound, in the step (3), the six-way valve is switched and kept in a blowback state, so that the single-channel analysis of the second analysis channel can be realized.
The invention also comprises the application of the multi-component volatile organic compound analysis method in the analysis of the environment monitoring VOCs standard gas.
According to a specific embodiment of the application of the present invention, x is 5, the target analysis component in the first analysis path is C2-part C5 component, and the target analysis component in the second analysis path is part C5 or more.
According to a particular embodiment of the application of the invention, the first detector is selected as FID, the second detector is selected as mass spectrometer, the pre-separation column is DB-1 and the first separation column is HP-PLOT Al2O3And the second separation column is DB-VRX.
According to a specific embodiment of the application of the present invention, after each sample is made, the two gas bottles are switched by using a switching valve, which selects a six-way valve.
Due to the adoption of the technical content, the invention has the following beneficial effects:
1) the invention is suitable for the detection and analysis of multi-component volatile organic compounds, adopts the conventional instrument combination, can effectively separate target components, does not need to worry about the type selection problem of chromatographic columns when light and heavy components are respectively analyzed, can select the chromatographic columns which are independently suitable for the light components and the heavy components, and realizes accurate quantitative and qualitative analysis;
2) the method has high test efficiency, the analysis of the light and heavy components does not interfere with each other, and when the light components are analyzed, the heavy components are concentrated and peak-appearing preferentially by utilizing a back-blowing technology, so that the heavy components are prevented from staying in the first separation column, and the analysis efficiency is improved;
3) according to the invention, two analysis samples generated by single sample introduction can be analyzed simultaneously, so that the consistency of the conditions of light and heavy components in sample analysis is ensured, the flow of the sample is stable in the analysis process, flow compensation is not needed, the analysis time is reduced, the stability and repeatability of analysis are improved, the sensitivity of a detector is not influenced, and other detection elements are not needed to be purchased additionally.
4) The traditional analysis sample introduction method can not select the switching of the six-way valve, the condition of baseline drift can be generated, the problem of baseline drift can be solved through the switching of the valves, and the accuracy of quantitative analysis is ensured.
5) When the standard gas is analyzed, because the influence of the other party is not needed to be considered when the light and heavy components are analyzed independently, the separation effect can be improved by combining the pre-separation with the first separation column, the mass spectrum is selected to analyze the heavy components, and the components which are analyzed in the first analysis passage can be filtered out on the spectrogram of the second analysis passage by changing the solvent delay time of the mass spectrum.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only show some embodiments of the present invention, as they should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of the principle of the analytical instrument of the present invention;
FIG. 2 is a schematic view of a sample injection route b of the analytical instrument of the present invention;
FIG. 3 is a schematic diagram of an analysis spectrogram of a light packet of an embodiment of the present invention;
FIG. 4 is a schematic diagram of an analysis spectrum of a reassembled packet according to an embodiment of the present invention;
in the drawing, 1 is a ten-way valve, 2 is a first detector, 3 is a second detector, 4 is a quantitative ring, 5 is a six-way valve, 6 is a pre-separation column, 7 is a first separation column, 8 is a second separation column, and 9 is a switching valve.
Detailed Description
The present invention will be described in further detail with reference to examples, which are provided only for illustrating the present invention and are not intended to limit the present invention.
As shown in fig. 1, an analyzer for multi-component volatile organic compounds includes a ten-way valve 1, a first detector 2, and a second detector 3.
The ten-way valve 1 is connected with a sample gas to be analyzed, the ten-way valve 1 is connected with two quantitative rings 4, and each quantitative ring is matched with a carrier gas circuit to form a first analysis passage and a second analysis passage which are independent;
the first detector 2 is connected with a first analysis passage, a six-way valve 5, a pre-separation column 6 for primarily separating sample gas and a first separation column 7 for completely and effectively separating a certain number of target components which preferentially pass through the pre-separation column 6 are arranged in the first analysis passage, a pipeline connected with the ten-way valve 1 sequentially passes through the six-way valve 5, the pre-separation column 6, the six-way valve 5, the first separation column 7, the six-way valve 5 and the first detector 2 to be connected in series to form a sample feeding route a, as shown in fig. 1, the sample feeding route can be back blown through the valve switching of the six-way valve, and the sample feeding pipeline sequentially passes through the six-way valve 5, the first separation column 7, the six-way valve 5, the pre-separation column 6, the six-way valve 5 and the first detector 2 to be connected in series to form a sample feeding route b, as shown in fig;
the second detector 3 is connected to a second analysis path in which a second separation column 8 is disposed in front of the second detector 3, the second separation column 8 being capable of separating at least a component of the target component of the sample gas analysis from the components other than the component that has been separated by the first separation column 7 effectively.
In one embodiment, the first detector is a FID detector and the second detector is a mass spectrometer or FID detector. According to the properties of the pre-separation column, the first separation column and the separated target components and the properties of the second separation column and the separated target components, selecting proper detectors and detection conditions to realize the total effective separation of all the target components in the sample gas. In this embodiment, the second detector is preferably a mass spectrometer.
In a specific embodiment, a switching valve 9 is connected between the ten-way valve and the sample gas, and the switching valve 9 can realize switching of different gas cylinders, such as the sample 1 and the sample 2 in fig. 1.
The invention also comprises a multi-component volatile organic compound analysis method, and an analysis instrument using the multi-component volatile organic compound analysis method comprises the following steps:
s1, adjusting the on-off state of the ten-way valve, serially connecting the sample gas, the ten-way valve and the quantitative rings, and filling the quantitative rings with the sample gas after stabilizing for a certain time;
s2, adjusting the on-off state of the ten-way valve to enable each quantitative ring to be communicated with the corresponding carrier gas path to form two independent analysis paths;
s3, the carrier gas carries the sample gas to enter a first analysis passage to be injected according to a sample injection route a, the sample gas is pre-separated firstly, and along the direction of the sample injection route a, when only target components of C2-Cx are all located on a gas passage formed by the six-way valve, the first separation column and the six-way valve, the six-way valve is switched to carry out back flushing, and the sample enters the first detector to be analyzed through a sample injection route b;
and S4, the carrier gas carries the sample gas into a second analysis channel, the target components at least containing more than x carbon are separated by the second separation column, and the target components enter the second detector for analysis.
The analysis method is characterized in that the components (target components) to be analyzed of the multi-component gas are divided into two groups according to the carbon content for analysis, and the analysis method comprises the following steps: light component groups, namely target components with part of carbon content of x and below; and (4) recombining the groups, wherein part of the target components have the carbon content of x and above. In the first analysis passage, the sample gas passes through the pre-separation column, under the condition of a sample introduction route a, the light component is primarily separated through the pre-separation column, a valve route is switched to be a sample introduction route b at a proper time, at the moment, the light component is about to enter or already enters or just passes through the first separation column, the recombinant group does not enter a pipeline of the six-way valve and the first separation column, a flow path is reversed under the condition of the sample introduction route b, the heavy component firstly enters the first detector, and then the light component can peak on the first detector according to a normal peak appearance sequence due to the fact that the light component always passes through the separation of the first separation column. By adopting the method, the recombined packets are firstly and quickly subjected to peak emergence in the detector, and because the recombined packets are not efficiently separated and usually aggregated into a large peak, the recombined packets can be directly deleted in the subsequent data processing, so that the analysis interference on the light packet can be avoided, and the condition that the analysis time of a single sample is too long due to the difficulty in separating the recombined packets on the first separation column can be avoided. And in the second analysis passage, the recombined packets are separated by the second separation column, and at the moment, the second separation column does not need to consider the separation condition of the lighter packets, and only needs to ensure that the heavier components at the rear section can be completely and effectively separated. This provides feasibility for the sizing of the column and also meets the characteristics of the column, for gas analysis of more components, a single column is difficult to perform a completely efficient separation, and columns generally suitable for heavy component separation are not suitable for light component separation. It should be noted that the carbon content x can be controlled by the type of the column, the specification of the column, the temperature of the column box, and the length of the pre-separation column.
In one embodiment, in the step (3), the six-way valve is switched and kept in a back flushing state, so that the second analysis channel single channel analysis can be realized.
This example provides an application of the aforementioned multi-component volatile organic compound analysis method in environmental monitoring of analysis of VOCs standard gas. Taking the 57 volatile organics of the PAMS materials of current standards as examples, these include ethane, ethylene, propane, propylene, isobutane, n-butane, acetylene, trans-2-butene, n-butene, cis-2-butene, isopentane, n-pentane, trans-2-pentene, 1-pentene, cis-2-pentene, isoprene, 2-dimethylbutane, cyclopentane, 2, 3-dimethylbutane, 2-methylpentane, 3-methylpentane, n-hexene, n-hexane, methylcyclopentane, 2, 4-dimethylpentane, cyclohexane, 2-methylhexane, benzene, 2, 3-dimethylpentane, 3-methylhexane, 2, 4-trimethylpentane, n-heptane, methylcyclohexane, 2,3, 4-trimethylpentane, propylene, isobutylene, 2-methyl-pentene, 2-methyl-2-pentene, 2, 2-methylheptane, 3-methylheptane, toluene, n-octane, ethylbenzene, p-xylene, m-xylene, n-nonane, styrene, o-xylene, cumene, propylbenzene, 3-ethyltoluene, 4-ethyltoluene, 1,3, 5-trimethylbenzene, n-decane, 2-ethyltoluene, 1,2, 4-trimethylbenzene, 1,2, 3-trimethylbenzene, 1, 3-diethylbenzene, 1, 4-diethylbenzene, n-undecane, n-dodecane. In this embodiment, x is 5, the target analysis component in the first analysis channel is C2-part C5 component, specifically isopentane, n-pentane, trans-2-pentene, 1-pentene, cis-2-pentene, isoprene, and in the second analysis channel isThe target analytical component in the analytical pathway is a component of part C5 and above, and C5 in the pathway is cyclopentane. In this example, the first detector was selected as FID, the second detector was selected as Mass Spectrometry, the pre-separation column was DB-1(30m x 320 μm x 1.8.8 μm), and the first separation column was HP-PLOT Al2O3(50m x 320 μm x 8 μm), and DB-VRX (60m x 320 μm x 1.8.8 μm) as a second separation column. The temperature of the column box is increased by a program, the initial temperature is 35 ℃ and is kept for 10min, and the temperature is increased to 180 ℃ at the speed of 5 ℃/min and is kept for 3 min. The selection of each separation column includes, but is not limited to, the above-mentioned types, and other columns capable of separating the above-mentioned components may be selected, or the groups of light and heavy components may be appropriately adjusted according to the different columns.
In fig. 3, the order of peaking: 1-ethane, 2-ethylene, 3-propane, 4-propylene, 5-isobutane, 6-n-butane, 7-acetylene, 8-trans-2-butene, 9-n-butene, 10-cis-2-butene, 11-isopentane, 12-n-pentane, 13-trans-2-pentene, 14-1-pentene, 15-cis-2-pentene, 16-isoprene. In fig. 4, the order of peaking: 1-2, 2-dimethylbutane, 2-cyclopentane, 3-2, 3-dimethylbutane, 4-2-methylpentane, 5-3-methylpentane, 6-n-hexene, 7-n-hexane, 8-methylcyclopentane, 9-2, 4-dimethylpentane, 10-cyclohexane, 11-2-methylhexane, 12-benzene, 13-2, 3-dimethylpentane, 14-3-methylhexane, 15-isooctane, 16-n-heptane, 17-methylcyclohexane, 18-2,3, 4-trimethylpentane, 19-2-methylheptane, 20-3-methylheptane, 21-toluene, 22-n-octane, 23-ethylbenzene, 24-p-xylene, p-xylene, 25-m-xylene, 26-n-nonane, 27-styrene, 28-o-xylene, 29-cumene, 30-propylbenzene, 31-3-ethyltoluene, 32-4-ethyltoluene, 33-1,3, 5-trimethylbenzene, 34-2-ethyltoluene, 35-n-decane, 36-1,2, 4-trimethylbenzene, 37-1,2, 3-trimethylbenzene, 38-1, 3-diethylbenzene, 39-1, 4-diethylbenzene, 40-n-undecane, 41-n-dodecane. As can be seen from both figures, the process achieves an effective and rapid complete separation of 57 components.
By adopting the test method of the embodiment, the test efficiency is high, the analysis of the light and heavy components is not interfered with each other, and when the light components are analyzed, the heavy components are concentrated and peak-appearing preferentially by utilizing a back-blowing technology, so that the heavy components are prevented from staying in the first separation column, and the analysis efficiency is improved; two analysis samples generated by single sample introduction can be analyzed simultaneously, so that the consistency of the conditions of the light and heavy components in sample analysis is ensured, the flow of the sample is stable in the analysis process, flow compensation is not needed, the analysis time is reduced, and the stability and the repeatability of the analysis are improved; when the standard gas is analyzed, because the influence of the other party is not needed to be considered when the light and heavy components are analyzed independently, the separation effect can be improved by combining the pre-separation with the first separation column, the mass spectrum is selected to analyze the heavy components, and the components which are analyzed in the first analysis passage can be filtered out on the spectrogram of the second analysis passage by changing the solvent delay time of the mass spectrum.
In one embodiment, after each sample is made, the switching valve is used for switching between the two gas bottles, and the switching valve selects the six-way valve. Environmental changes (temperature, pressure, etc.) can affect chromatographic analysis, leading to irregular drift of the chromatographic baseline, which in turn affects the final analysis results. The mass spectrum detector is also influenced by the vacuum degree and is particularly easy to drift, and the problem of baseline drift can be solved by adopting a method of alternately injecting samples into two bottles of samples, so that the accuracy of quantitative analysis is ensured.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modifications, equivalents, improvements, etc. that are made within the spirit and the principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. An apparatus for analyzing a multi-component volatile organic compound, comprising:
the ten-way valve is connected with a sample gas to be analyzed, the ten-way valve is connected with two quantitative rings, and each quantitative ring is matched with the carrier gas path to form a first analysis passage and a second analysis passage which are independent;
the first detector is connected with the first analysis passage, a six-way valve, a pre-separation column for primarily separating the sample gas and a first separation column for completely and effectively separating a certain number of target components preferentially passing through the pre-separation column are arranged in the first analysis passage, a pipeline connected with the ten-way valve is sequentially connected in series through the six-way valve, the pre-separation column, the six-way valve, the first separation column, the six-way valve and the first detector to form a sample feeding route a, back flushing can be realized through the valve switching of the six-way valve, and a sample feeding pipeline is sequentially connected in series through the six-way valve, the first separation column, the six-way valve, the pre-separation column, the six-way valve and the first detector to form a sample feeding route b during back flushing;
and a second detector connected to the second analysis path, wherein a second separation column capable of separating at least a component of the target component of the sample gas analysis from the components of the target component of the sample gas analysis, excluding the component that has been separated by the first separation column, is disposed in front of the second detector.
2. The apparatus of claim 1, wherein the first detector is a FID detector and the second detector is a mass spectrometer or FID detector.
3. The apparatus for analyzing multicomponent voc of claim 1, wherein a switching valve is connected between the ten-way valve and the sample gas, and the switching valve can switch different gas cylinders.
4. A method for analyzing a multi-component volatile organic compound, which is characterized by using the apparatus for analyzing a multi-component volatile organic compound according to any one of claims 1 to 3, comprising the steps of:
s1, adjusting the on-off state of the ten-way valve, serially connecting the sample gas, the ten-way valve and the quantitative rings, and filling the quantitative rings with the sample gas after stabilizing for a certain time;
s2, adjusting the on-off state of the ten-way valve to enable each quantitative ring to be communicated with the corresponding carrier gas path to form two independent analysis paths;
s3, the carrier gas carries the sample gas to enter a first analysis passage to be injected according to a sample injection route a, the sample gas is pre-separated firstly, and along the direction of the sample injection route a, when only target components of C2-Cx are all located on a gas passage formed by the six-way valve, the first separation column and the six-way valve, the six-way valve is switched to carry out back flushing, and the sample enters the first detector to be analyzed through a sample injection route b;
s4, the carrier gas pushes the sample gas to enter a second analysis channel, the target components containing at least carbon with the quantity more than x are separated by the second separation column, and the target components enter the second detector for analysis.
5. The method for analyzing multicomponent volatile organic compounds according to claim 4, wherein in step (3), the six-way valve is switched and kept in a blowback state, so that the second analysis channel single-channel analysis can be realized.
6. The application of the multi-component volatile organic compound analysis method of any one of claims 4 to 5 in environmental monitoring VOCs standard gas analysis.
7. The use of claim 6, wherein x is 5, the target analytical component in the first analytical path is a component from C2 to part C5, and the target analytical component in the second analytical path is a component from part C5 and above.
8. Use according to claim 7, wherein the first detector is selected as FID, the second detector is selected as mass spectrometer, the pre-separation column is DB-1 and the first separation column is HP-PLOT Al2O3And the second separation column is DB-VRX.
9. Use according to claim 7, characterized in that after each sample has been made, the two bottles are switched between by means of a switching valve, which selects a six-way valve.
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| CN114755349A (en) * | 2022-06-14 | 2022-07-15 | 四川晟实科技有限公司 | Automatic analysis system and method for low-temperature double-column chromatography of atmospheric volatile organic compounds |
| CN115308315A (en) * | 2022-04-08 | 2022-11-08 | 四川省生态环境监测总站 | Volatile organic compound component monitoring and analyzing system |
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