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A NO<3><->-<17>O isotope detection method for trace nitrates in ice cores

A NO3--17O and detection method technology, which is applied in the field of NO3‑‑17O isotope detection of trace nitrates in ice cores, can solve problems such as lack of development, improve test accuracy, ensure sample purity, and test results are accurate and stable Effect

Active Publication Date: 2017-02-15
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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Problems solved by technology

Although the above test methods are very mature, but NO 3 - - 17 O research especially on trace NO in ice cores 3 - - 17 O research is still in its infancy internationally, and has not been carried out in my country

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  • A NO&lt;3&gt;&lt;-&gt;-&lt;17&gt;O isotope detection method for trace nitrates in ice cores
  • A NO&lt;3&gt;&lt;-&gt;-&lt;17&gt;O isotope detection method for trace nitrates in ice cores
  • A NO&lt;3&gt;&lt;-&gt;-&lt;17&gt;O isotope detection method for trace nitrates in ice cores

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Embodiment Construction

[0021] The present invention adopts the temperature control range of the electric cold trap (2) at -10°C to 100°C, and freezes N at the temperature of -10°C 2 Moisture in the O gas, the frozen water will be discharged from the system when the temperature rises; the chemical trap (3) is filled with magnesium perchlorate and soda lime, which is mainly used to dry and remove CO 2 Gas; VOC trap (4) is placed in alcoholic liquid nitrogen, the temperature is controlled at -60°C~-80°C, and it is mainly used to remove back-digestion bacteria to prepare N 2 The organic gas composition produced during O gas, avoiding the consumption of oxygen in the sample by VOC gas in the cracking furnace. At the same time, most of the refrigerated VOC gas can also be discharged by backflushing by heating, which ensures the purity of the sample entering the mass spectrometer and improves the test accuracy; Catalyst cracking N 2 O gas to N 2 and O 2 ; The chromatographic column (10) is a 5A molecul...

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Abstract

A NO<3><->-<17>O isotope detection method for trace nitrates in ice cores is disclosed. The method includes a) a step of enrichment and test analysis for trace NO<3><-> in an ice core aqueous solution, b) a step of converting the NO<3><-> into N2O through a denitrifying bacterium process, and c) a step of analyzing nitrogen and oxygen stable isotopes for constant N2O gas. The detection method achieves enrichment and purification of nitrous oxide generated by the denitrifying bacterium process, and removes gaseous CO2, water vapour and a large amount of organic components generated in a bacterial reaction process, thus avoiding influences of impurity gases entering a mass spectrograph on a test result. Through a pyrolysis technique for the nitrous oxide gas, isotope analysis on [delta]<15>N / <14>N and [delta]<17>O / <16>O or excess <17>O / <16>O and [delta]<18>O / <16>O for N2 and O2 can be achieved.

Description

technical field [0001] The invention relates to a method for treating trace nitrate NO in ice cores 3 - - 17 O isotope detection method. Background technique [0002] Domestic and foreign methods for analyzing stable isotopes of nitrogen or oxygen in nitrate mainly include: pyrolysis method, using anion resin separation, cation exchange membrane conversion, high temperature pyrolysis to produce O 2 and isotope mass spectrometry. This method can only measure NO 3 - Oxygen isotopes in the nitrate sample; Cao Yacheng, Nanjing Soil Institute, Chinese Academy of Sciences, etc. used a chemical reaction method to convert nitrate samples into N 2 O gas, and N was determined by an isotope mass spectrometer with an automatic pre-concentration device 2 in O 15 N abundance, mainly used in soil NO 3 - Nitrogen isotope research, this method can only measure NO 3 - Nitrogen isotopes in . Zhang Cuiyun, Institute of Hydrogeology, Environmental Geology, Chinese Academy of Geolo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/08G01N30/96
CPCG01N30/02G01N30/08G01N30/96
Inventor 崔晓庆赵果王肖波赵霞
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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