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Atmospheric and Oceanic Optics

2022 year, number 2

Development and implementation of UV absorption methods of gas analysis for environmental monitoring of the atmosphere

P.P. Geiko1,2, V.A. Korolkov1, V.V. Tatur1
1Institute of Monitoring of Climatic and Ecological Systems of the Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia
2National Research Tomsk State University
Keywords: absorption spectroscopy, gas analyzer, LEDs, UV-radiation, nitrogen oxides, mercury, Zeeman effect

Abstract

Stationary non-laser gas analyzers based on the classical differential absorption method have been designed for continuous measurement of the content of nitrogen and sulfur oxides in exhaust gases of thermal power plants natural gas, coal, and fuel oil. The operation of gas analyzers at Russian thermal power plants based on has shown their high sensitivity, reliability, and ease of maintenance. Based on the method of differential optical absorption spectroscopy and UV LEDs, a prototype of a portable low-power gas analyzer has been designed. It is an effective tool for simultaneous trace measurements of concentrations of a number of atmospheric gases. A mercury analyzer has been created based on the atomic absorption method using a capillary lamp with a natural isotopic composition of mercury with a transverse Zeeman effect as a radiation source. A technique for determining mercury in various media has been developed; the sensitivity of the analyzer is 14 ng/m3. The possibility of its wide use for multi-purpose mercury monitoring is shown.