Method and device for decoupling and high-precision measurement of concentrations of nitrogen dioxide and ozone in atmosphere

Abstract

The invention relates to a method and a device for decoupling and high-precision measurement of concentrations of nitrogen dioxide and ozone in atmosphere. Based on the good linearity and repeatability of the O3 electrochemical sensor, the influence of NO2 on O3 shows a stable function relationship, NO2 and H2O in sample gas are converted into solids by controlling the temperature of the cold trap assembly, the accurate concentration of NO2 and O3 can be obtained by using one O3 electrochemical sensor, the cross influence of the NO2 and O3 electrochemical sensors can be overcome, and the concentration of NO2 and O3 in the sample gas can be accurately detected. The problem that the NO2 electrochemical sensor is poor in measurement precision can be solved, high-precision measurement of the concentration of nitrogen dioxide and ozone in the atmosphere is completed, and the concentration of other gases in the atmosphere can be further measured by connecting other electrochemical gas sensors in series or in parallel.

Description

technical field [0001] The invention belongs to the field of atmospheric monitoring, in particular to a method and device for decoupling and high-precision measurement of nitrogen dioxide and ozone concentrations in the atmosphere. [0002] technical background [0003] Air pollution is one of the major problems in today's world. At present, the main strategy is to establish a network of air quality monitoring stations and collect air quality monitoring data in real time to achieve effective control of urban air pollution. [0004] At present, there are four levels of environmental monitoring stations in my country (national, provincial, municipal and county levels), and the main gases for air quality monitoring include SO 2 , NO 2 , CO and O 3 . These monitoring stations have accumulated a large amount of air quality monitoring data over the years, providing a basic support for the control of air pollution. However, due to the nature of air pollution, urban areas can exh...

AI Technical Summary

Problems solved by technology

o 3 The linearity of the electrochemical sensor is good, but its measurement accuracy is affected by the NO 2 The impact is relatively large, and the amount of this impact depends on the NO in the atmosphere 2 concentration

Experimental data show that NO 2 to O 3 The influence of the presents a relatively stable functional relationship, if NO 2 The sensor can accurately measure NO 2 Concentration, you can get accurate O 3 Concentration, but NO 2 Electrochemical sensors have poor linearity and repeatability in practical applications, so in practical applications, NO 2 and O 3 It is difficult to accurately measure the concentration

[0008] At present, this problem limits the continuous use of the high-density monitoring network of electrochemical gas sensors. If it cannot be solved, it will bring huge losses to the country's investment in the future

Images