Online measurement system and method for organic chemical components in particulate matter

Abstract

The invention relates to an online measurement system and method for organic chemical components in particulate matter. The system comprises a particulate matter cutter, an activated carbon diffusion pipe, a diffusion drying pipe, an electric three-way valve, a collection-thermal desorption device, a constant-temperature four-way valve, a sampling pump, a low-temperature cold trap, a gas chromatograph and other assemblies. In the measuring process, a sampling mode, a purging mode, a thermal desorption mode, an analysis mode and a temperature drop mode are adopted in sequence, the five working modes are switched automatically, continuously and cyclically, online trapping, thermal desorption and organic chemical component enrichment of the particulate matter are realized, and finally the gas chromatograph is adopted for conducting separation detection on the organic chemical components. The online measurement system and method have the advantages that online measurement is adopted; measuring time resolution is 30-60 minutes; a filter membrane used for particulate matter collection can be replaced, so that influences of residual matter during measurement are avoided; by the adoption of the 40 DEG C low-temperature cold trap, high-volatility organic components can be measured; the online measurement system and method are compact in structure, easy and convenient to operate, reliable in result and capable of being applied to measurement of the atmosphere and other particulate matter systems.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to an online measurement system and method for organic chemical components of particulate matter. Background technique [0002] At present, my country's atmospheric particulate matter pollution is becoming more and more serious, and the regional smog pollution caused by it has attracted widespread attention from all walks of life. Atmospheric particulate matter has an important impact on human health, atmospheric visibility, regional air pollution, and global climate change. The composition of particulate matter, especially the organic components in it, is an important factor that determines its environmental effects. Organic matter is the main component of atmospheric particulate matter, and its content can account for 20%-80% of the total particulate matter. Accurate measurement of rapidly changing atmospheric organic particulate matter is the basis f...

AI Technical Summary

Problems solved by technology

At present, there are still many problems and deficiencies in the TAG system: for example, the sampling filter membrane of the existing system cannot be replaced, and may be affected by residual components during reuse; the existing organic enrichment method is not efficient for highly volatile organic components

However, in these two patents, the sampling of the continuous particulate matter monitor and the off-line analysis of organic pollutants are two separate steps, and the continuous measurement of organic particulate matter cannot be truly realized, and the sampling period of the continuous particulate matter monitor is often greater than 8 hours, which cannot Meet the requirements of high temporal resolution

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