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Gas chromatography for analyzing methane and nitrous oxide in air by one sample injection

A gas chromatography and nitrous oxide technology, applied in the field of nitrous oxide and gas chromatography to analyze methane in the atmosphere with one sample injection, can solve the problems of large data accuracy error, prolong the sample measurement period, etc., and reduce the data accuracy error. , The effect of shortening the sample measurement cycle and easy operation

Inactive Publication Date: 2011-04-06
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, gas chromatography is used to analyze N in the atmosphere 2 O, CH 4 The components need to be injected twice to get the final result. This method not only causes large data accuracy errors, but also prolongs the sample measurement cycle.

Method used

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  • Gas chromatography for analyzing methane and nitrous oxide in air by one sample injection
  • Gas chromatography for analyzing methane and nitrous oxide in air by one sample injection
  • Gas chromatography for analyzing methane and nitrous oxide in air by one sample injection

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1 Gas Chromatography One-time sampling analysis of methane, nitrous oxide in the atmosphere: first the purity is less than 10 -5 % carrier gas - He passes through the purifier at an output pressure of 0.20Mpa, so that the purity of the purified carrier gas is less than 10 -6 %; then pass the purified carrier gas into the chromatographic column of the gas chromatograph where the sample to be tested has been placed at a temperature of 40°C at a flow rate of 15ml / min, and after adsorption and desorption at a temperature of 90°C , the nitrous oxide and methane in the sample to be tested enter the ECD and the FID in turn, and are detected at a temperature of 110°C; finally, the data obtained by the ECD and the FID are simultaneously input to the chromatographic workstation in the gas chromatograph, and the analysis results can be obtained Chromatogram.

[0024] Among them: the chromatographic column refers to a stainless steel tube with an inner diameter of 1mm, a c...

Embodiment 2

[0026] Embodiment 2 gas chromatography single-injection analysis atmosphere methane, nitrous oxide: first the purity is less than 10 -5 % carrier gas—Ne passes through the purifier at an output pressure of 0.60Mpa, so that the purity of the purified carrier gas is less than 10 -6 %; then pass the purified carrier gas into the chromatographic column of the gas chromatograph with the flow rate of 85ml / min at a temperature of 35°C, and after adsorption and desorption at a temperature of 70°C , the nitrous oxide and methane in the sample to be tested enter the ECD and the FID in turn, and detect at a temperature of 350°C; finally, the data obtained by the ECD and the FID are simultaneously input to the chromatographic workstation in the gas chromatograph, and the analysis results can be obtained Chromatogram.

[0027] Among them: the chromatographic column refers to a stainless steel tube with an inner diameter of 5mm, a column length of 9m, and filled with Porapak, Chromosorb, G...

Embodiment 3

[0029] Embodiment 3 gas chromatographic analysis of methane, nitrous oxide in the atmosphere at one time sample injection: at first the purity is less than 10 -5 % of carrier gas——Ar passes through the purifier at an output pressure of 0.40Mpa, so that the purity of the purified carrier gas is less than 10 -6 %; then pass the purified carrier gas into the chromatographic column of the gas chromatograph where the sample to be tested has been placed at a temperature of 30°C at a flow rate of 50ml / min, and after adsorption and desorption at a temperature of 50°C , the nitrous oxide and methane in the sample to be tested enter the ECD and the FID in turn, and detect at a temperature of 230°C; finally, the data obtained by the ECD and the FID are simultaneously input to the chromatographic workstation in the gas chromatograph, and the analysis results can be obtained Chromatogram.

[0030] Among them: the chromatographic column refers to a stainless steel tube with an inner diamet...

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Abstract

The invention relates to a gas chromatography for analyzing methane and nitrous oxide in air by one sample injection, which is characterized by comprising the following steps: enabling a carrier gas, of which the purity is lower than 10-5%, to pass through a purifier under the output pressure of 0.20-0.60 MPa, so that the purity of the purified carrier gas is lower than 10-6%; introducing the purified carrier gas into a chromatographic column of a gas chromatograph, in which a sample to be detected is placed, at the flow rate of 15-85 ml / min at the temperature of 15-40 DEG C, absorbing and desorbing at 20-90 DEG C, and after nitrous oxide and methane in the sample to be detected orderly enter an electron capture detector and a hydrogen flame ionization detector, carrying out detection at 110-350 DEG C; and finally, simultaneously inputting the data obtained by the electron capture detector and the hydrogen flame ionization detector into a chromatogram work station of the gas chromatograph, thereby obtaining the analytic result chromatogram. The invention is simple and easy to operate, can effectively lower the data accuracy error, and shortens the sample measurement period.

Description

technical field [0001] The invention relates to the analysis of methane and nitrous oxide in the fields of coal mine safety, environmental protection, air separation preparation and the like, and in particular relates to the analysis of methane and nitrous oxide in the atmosphere by gas chromatography with one injection. Background technique [0002] At present, gas chromatography is used to analyze N in the atmosphere 2 O, CH 4 The components need to be sampled twice to get the final result. This method not only causes large errors in data accuracy, but also prolongs the sample measurement cycle. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a gas chromatographic method for analyzing methane and nitrous oxide in the atmosphere by one-time sample injection, which can effectively reduce data accuracy errors and shorten the sample measurement cycle. [0004] In order to solve the above problems, the gas chromat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/14G01N30/68G01N30/70
Inventor 潘旭
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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