Enrichment analysis instrument of carbon and nitrogen of greenhouse gases of CO2 and N2O

Abstract

The invention discloses an enrichment analysis instrument of carbon and nitrogen of the greenhouse gases of CO2 and N2O. A greenhouse gas sample collected by a sampling tube is led through a sample guiding valve under the He gas, is dehydrated by an electron cold trap, undergoes enrichment and transferring in a liquid nitrogen cold trap, undergoes separation by a chromatographic column and dehydrating by a water trap and is led into a gas isotope mass spectrometer through an opened shunting port for being detected. The enrichment analysis instrument has the port which is directly connected with an isotope mass spectrometer mainframe, is an independent accessory device of the isotope mass spectrometer and carries out assay determination on isotope abundance of the carbon and the nitrogen of the greenhouse gases of CO2 and the N2O which are greenhouse gases at the same time. The gas is transferred from a cold trap T1 to a cold trap T2 through conversion of gas-carrying flow and by changing a freezing state of the target gas in the traps. Meanwhile, other impurity gases which are captured by a freezing gas are released and thus, good chromatographic peak shapes and higher purity of the sample are achieved and the testing precision is improved.

Description

Technical field [0001] The present invention involves a pair of greenhouse gas 2 And N 2 O carbon nitrogen element rich analyzer. [0002] Background technique [0003] Greenhouse gas (GHG) includes carbon dioxide (CO 2 ), Nitrogen oxide (n 2 O), methane (CH 4 ), Sulfluoride (sf 6 ) Wait, the carbon dioxide and nitrogen oxide are the most important greenhouse gases in the atmosphere of the earth. They not only cause the global warming, but also affect the various life forms in the entire earth ecosystem.One of the important research topics of various ecosystems and global climate change.In the study of the frozen circle environment records, science and technology workers used the static box-gas color spectrum method to discuss the seasonal changes, emissions and main control factors of soil greenhouse gas emissions in the frozen soil area for many years;-An gas chromatography, detecting the concentration of these gases in the ice core parcel, analyzes the glacial climate and envi...

AI Technical Summary

Problems solved by technology

In the study of the isotope distribution and influence of various gases, due to the low concentration of the sample, it is difficult to separate (the concentration range of soil greenhouse gases, the concentration range of carbon dioxide is 240-9000 ppm, and the concentration range of nitrous oxide is 0.10-0.60 ppm). The amount of samples collected and manually processed is very large, which limits the implementation and progress of this work. It is necessary to realize the carbon and nitrogen isotope analysis of greenhouse gases carbon dioxide and nitrous oxide, explore their production mechanism and migration rules, and quantify the different layers of soil greenhouses. The contribution rate of gases to the total surface emissions and the prediction of future climate change trends require the enrichment of greenhouse gases CO2 and N2O carbon and nitrogen elements and the use of isotope analysis techniques to complete

[0004] At present, there is PreCon produced by Thermo Fisher Scientific (American Thermal Power Group) in domestic and foreign markets. It is a trace gas pre-concentrator, which is only suitable for enriching N in the air. 2O and methane, and then provide samples to other devices, such as GC-GP, GasBench, or GCC, so its main limitation is: not a complete stand-alone device that can be directly connected to an isotope mass spectrometer , does not include GC and isotope online interface; there are also G2131-I CO2 isotope analyzer and G5101-I N2O isotope analyzer produced by American Picarro Company, they It uses wavelength-scanning optical cavity ring-down spectroscopy (WS-CRDS) to measure a single component in greenhouse gases, and it is impossible to simultaneously analyze two gases online

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