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Device and method for detecting [delta]13C of atmospheric methane

A detection device, methane technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that the conversion efficiency of the combustion reactor cannot be guaranteed, the continuous online analysis cannot be satisfied, and the measurement accuracy of the analyzer is low, so as to eliminate carbon isotope fractionation effect, increase the reuse rate, and the effect of high detection accuracy

Active Publication Date: 2021-10-15
HANGZHOU PUYU TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Thermo's PreCon gas pre-concentration device is combined with an isotope ratio mass spectrometer (IRMS). 4 into CO 2 , into the isotope mass spectrometer analysis; the PreCon-IRMS method using liquid nitrogen refrigeration cannot meet the needs of continuous on-line analysis. In addition, the conversion efficiency of the combustion reactor cannot be guaranteed to be 100% conversion all the time
In addition, other organic compounds in the atmosphere will also be converted into CO2 in the converter, and the memory effect in the pipeline will cause isotope fractionation, which will make the measurement bias
[0006] 2. Picarro's products based on optical cavity ring down technology, Picarro's products can meet the requirements of online measurement, but the measurement accuracy of the analyzer is relatively low

Method used

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  • Device and method for detecting [delta]13C of atmospheric methane
  • Device and method for detecting [delta]13C of atmospheric methane
  • Device and method for detecting [delta]13C of atmospheric methane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 1 Atmospheric methane δ for the examples of the present invention is given 13 Schematic diagram of the detection device of C, such as figure 1 As shown, the atmospheric methane δ 13 The detection device of C includes:

[0043] A trapping unit, the trapping unit comprising:

[0044] Enrichment module and separation module) (such as a chromatographic column); the enrichment module adopts a low-temperature enrichment method, such as the method of adding packing by physical refrigeration (such as TEC refrigeration);

[0045] A multi-way valve, the ports of the multi-way valve are respectively connected to the enrichment module and the separation module, and the multi-way valve is used to make the sample gas pass through the multi-way valve and the enrichment module in sequence when switching, and to make the load The gas passes through the enrichment module and the separation module in turn;

[0046] A conversion unit, the conversion unit is used to convert meth...

Embodiment 2

[0085] Atmospheric methane δ according to Example 1 of the present invention 13 Application examples of the detection device and method of C.

[0086] Such as figure 1 As shown, the first processing module is filled with Mg(ClO 4 ) 2 and NaOH, so as to remove carbon dioxide and water in the sample gas. One end of the first processing module receives the sample gas, and the other end is connected to the port of the multi-way valve; both ends of the enrichment module are connected to the port of the multi-way valve, and the enrichment module "U" Type cold trap, using TEC refrigeration, and has methane-enriched packing;

[0087] The separation module uses a chromatographic column, the inlet is connected to the port of the multi-way valve, and the outlet is respectively connected to the detector (FID detector) and the conversion unit (combustion conversion furnace); the outlet of the conversion unit is connected to the detector and the water removal module (such as Nafion tube)...

Embodiment 3

[0108] Atmospheric methane δ according to Example 1 of the present invention 13 The application example of the detection device and method of C is different from Embodiment 2 in that:

[0109] In a time-of-flight mass analyzer, such as image 3 As shown, the first grid 21 and the second grid 22 are grounded, which ensures the equipotential of the first grid 21 and the second grid 22; between the pulling electrode 12 and the first incident grid 31 there is a multi-hole that allows ions to pass through Electrodes, and use the voltage dividing resistor to divide the voltage of multiple electrodes, so that the electric field strength in the first ion acceleration area is uniform; the power supply applies positive pulse voltage to the repelling electrode 11, and applies negative pulse voltage to the pulling electrode 12;

[0110] The reflective area includes a first reflective field and a second reflective field, the first reflective field includes a second incident grid 32 and a ...

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Abstract

The invention provides a device and method for detecting [delta]13C of atmospheric methane. The device for detecting [delta]13C of atmospheric methane comprises a trapping unit and a detection unit, wherein the trapping unit comprises an enrichment module and a separation module. The trapping unit comprises that a port of a multi-way valve communicates with the enrichment module and the separation module separately, and the multi-way valve is used for enabling sample gas to sequentially pass through the multi-way valve and the enrichment module and enabling carrier gas to sequentially pass through the enrichment module and the separation module when the multi-way valve is switched; a conversion unit is used for converting methane into carbon dioxide, and an outlet of the conversion unit communicates with the detection unit; and the first treatment module is arranged on the flow path in front of the conversion unit and is used for removing carbon dioxide in the sample gas. The device and method have the advantages of high detection precision and the like.

Description

technical field [0001] The present invention relates to elemental analysis, in particular to atmospheric methane delta 13 C detection device and method. Background technique [0002] Atmospheric greenhouse gases mainly include carbon dioxide, methane, nitrous oxide, and halogenated hydrocarbons. Since the industrial revolution, the concentration of greenhouse gases in the global atmosphere has continued to rise. CH 4 Concentrations were 160% higher than pre-industrial levels, triggering severe global warming effects. In order to cope with global warming, it is imperative to strengthen the monitoring of greenhouse gases. However, monitoring the concentration of greenhouse gases can only reflect their cumulative process, and cannot determine the cause of the concentration change. Only by accurately measuring the stable isotopic composition of greenhouse gases can we further understand the sources and sinks of these gases and the mechanisms that produce them. [0003] Due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/08G01N30/20G01N30/68G01N30/72
CPCG01N30/02G01N30/06G01N30/08G01N30/20G01N30/68G01N30/7206G01N2030/201
Inventor 朱信旭刘盈智刘立鹏汪维昊黄俊兴胡晓飞王鹏
Owner HANGZHOU PUYU TECH DEV CO LTD