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Method for analyzing nitrous oxide, methane and carbon dioxide in atmosphere by injecting sample once

A technology of nitrous oxide and carbon dioxide, which is applied in the field of carbon dioxide and one-shot analysis of nitrous oxide and methane in the atmosphere. It can solve the problems of data accuracy error and prolong the sample measurement period, so as to improve the data accuracy, shorten the sample measurement period, easy-to-use effects

Inactive Publication Date: 2011-11-16
LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, gas chromatography is used to analyze N in the atmosphere 2 O, CH 4 , CO 2 Components need more than two injections to get the final result. This method not only causes large errors in data accuracy, but also prolongs the sample measurement cycle.

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  • Method for analyzing nitrous oxide, methane and carbon dioxide in atmosphere by injecting sample once
  • Method for analyzing nitrous oxide, methane and carbon dioxide in atmosphere by injecting sample once
  • Method for analyzing nitrous oxide, methane and carbon dioxide in atmosphere by injecting sample once

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Embodiment 1

[0025] The method of embodiment 1 one-time sampling analysis nitrous oxide, methane, carbon dioxide in the atmosphere, at 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 with the flow rate of 25ml / min at a temperature of 25°C, after adsorption and desorption at a temperature of 25°C The nitrous oxide, methane and carbon dioxide in the sample to be tested enter the thermal conductivity cell detector (TCD), electron capture detector (ECD), and hydrogen flame ionization detector (FID) in sequence, and are detected at a temperature of 90°C ; Finally, the data obtained by thermal conductivity cell detector (TCD), electron capture detector (ECD) and hydrogen flame ionization detector (FID) are input to the chromatographic workstation in the gas chromatograp...

Embodiment 2

[0028] The method of embodiment 2 one-time sampling analysis nitrous oxide, methane, carbon dioxide in the atmosphere, at 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 -7 %; then pass the purified carrier gas into the chromatographic column in the gas chromatograph where the sample to be tested has been placed at a flow rate of 195ml / min at a temperature of 65°C, and after adsorption and desorption at a temperature of 250°C , the nitrous oxide, methane and carbon dioxide in the sample to be tested enter the TCD, ECD, and FID in turn, and are detected at a temperature of 350°C; finally, the data obtained by the TCD, ECD, and FID are simultaneously input to the chromatographic workstation in the gas chromatograph , the chromatogram of the analysis result can be obtained.

[0029] Among them: the chromatographic column refers to a stainless steel tu...

Embodiment 3

[0031] The method of embodiment 3 one-time sampling analysis nitrous oxide, methane, carbon dioxide in the atmosphere, 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 45°C at a flow rate of 110ml / min, and after adsorption and desorption at a temperature of 150°C , the nitrous oxide, methane and carbon dioxide in the sample to be tested enter the TCD, ECD, and FID in turn, and are detected at a temperature of 220°C; finally, the data obtained by the TCD, ECD, and FID are simultaneously input to the chromatographic workstation in the gas chromatograph , the chromatogram of the analysis result can be obtained.

[0032] Among them: the chromatographic column refers to a stainless stee...

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Abstract

The invention relates to a method for analyzing nitrous oxide, methane and carbon dioxide in atmosphere by injecting a sample once, comprising the following steps of: firstly, passing a carrier gas at a purity of 10-5% below through a purifier with 0.20-0.60 MPa of output pressure so that the purity of the purified carrier gas is 10-6% or 10-7% below; secondly, charging the purified carrier gas in a chromatographic column with a to-be-tested sample in a gas chromatograph, after an adsorption-desorption function, orderly conveying the nitrous oxide, methane and carbon dioxide in the to-be-tested sample into a thermal conductivity cell detector, an electron capture detector and a hydrogen flame ionization, then detecting at 90-350 DEG C; and finally, simultaneously inputting the data obtained by the thermal conductivity cell detector, the electron capture detector and the hydrogen flame ionization into the chromatographic working station of the gas chromatograph to obtain an analysis result chromatogram. The method in the invention is simple, easy to operate, and capable of efficiently decreasing data precision error and shorting sample measurement period.

Description

technical field [0001] The invention relates to the analysis of nitrous oxide, methane and carbon dioxide in the fields of coal mines, environmental protection, air separation preparation and the like, and in particular relates to a method for analyzing nitrous oxide, methane and carbon dioxide in the atmosphere at one time. Background technique [0002] At present, gas chromatography is used to analyze N in the atmosphere 2 O, CH 4 , CO 2 The components need to be injected more than two times to obtain the final result. This method not only causes large data accuracy errors, 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 method for analyzing nitrous oxide, methane and carbon dioxide in the atmosphere with one sample injection, which can effectively reduce data accuracy errors and shorten the sample measurement cycle. [0004] In order to solve the above probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/16G01N30/88
Inventor 潘旭
Owner LANZHOU CENT FOR OIL & GAS RESOURCES INST OF GEOLOGY & GEOPHYSICS CAS
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