A method and device for detecting trace nitrogen oxides in the atmosphere

A technology for nitrogen oxides and detection methods, which is applied in the field of gas chromatography analysis, can solve the problems of large measurement deviations of methods and devices, and achieve the effects of convenient operation, stable system operation, and meeting observation requirements

Active Publication Date: 2021-01-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The invention provides a method and device for detecting trace nitrogen oxides in the atmosphere, which solves the problem of large measurement deviation of existing methods and devices

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  • A method and device for detecting trace nitrogen oxides in the atmosphere
  • A method and device for detecting trace nitrogen oxides in the atmosphere
  • A method and device for detecting trace nitrogen oxides in the atmosphere

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[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] Recent research reports, NO 2 Can be directly used as an oxidant to significantly promote SO 2 Heterogeneous or heterogeneous oxidation on the surface of particulate matter, and it is speculated that this mechanism may be the main reason for the formation of fine sulfate particles in winter in the vast areas of our country. Given NO X The key role in atm...

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Abstract

The invention provides a method and a device for detecting trace nitrogen oxide in atmosphere, and solves the problem of large measurement deviation of the existing method and device. The method comprises the following steps: collecting to-be-detected atmosphere to obtain collected gas; collecting the to-be-detected atmosphere, and converting nitrogen oxide in the to-be-detected atmosphere into peroxyacetyl nitrate to obtain converted gas; separating and detecting peroxyacetyl nitrate in the conversion gas and the collection gas respectively to obtain first concentration and second concentration of peroxyacetyl nitrate respectively; and calculating the concentration of nitrogen oxide in the atmosphere to be detected according to the first concentration and the second concentration of peroxyacetyl nitrate. The device for detecting the trace nitrogen oxide in the atmosphere is used for the method. According to the invention, high-sensitivity detection of trace nitrogen oxide in atmosphere can be realized.

Description

technical field [0001] The invention relates to the technical field of gas chromatography analysis, in particular to a method and device for detecting trace nitrogen oxides in the atmosphere. Background technique [0002] Atmospheric nitrogen oxides (NO X ) undergoes a series of photochemical reactions under solar radiation, causing an increase in the concentration of atmospheric oxidants, thereby accelerating the transformation of primary gaseous pollutants into secondary particulate matter, and eventually leading to the formation of photochemical smog pollution. Existing NO X Detection technologies mainly include two categories: one is based on NO 2 The direct measurement methods mainly include wet chemical method, luminol method, and spectroscopic method; the second is the direct measurement technology based on NO, currently mainly using NO and O 3 Direct detection of NO by the principle of chemiluminescence, NO 2 It is mainly determined indirectly after conversion to...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 张成龙刘成堂牟玉静贺晓伟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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