Online enrichment system for gaseous and granular semi-volatile organic compounds and method and application

Abstract

The invention relates to an online enrichment system for gaseous and granular semi-volatile organic compounds. The system comprises a vaporizing chamber, an electromagnetic three-way valve, a first two-position six-way valve, a particulate trapping device, a primary trapping trap, a secondary focusing trap, a second two-position six-way valve, a first mass flow controller, a second mass flow controller, a gas pump, a gas chromatography-mass spectrometry detection system, an enrichment-thermal desorption device, a gas supply and pressure control system, a sample injection pipe and a heat tracing system. The system is simple in gas circuit; gaseous and granular SVOCs can be enriched on line and directly measured; the time resolution is 85 min; the gaseous and granular semi-volatile organic compounds are captured and measured on line; errors of a traditional indirect measurement and calculation method are avoided; the time resolution is high; energy consumption is low; the structure is compact; the device is small; operation is easy; the result is reliable; and the gaseous and granular semi-volatile organic compounds can be accurately measured on line.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, in particular to an online enrichment system, method and application of gaseous and granular semi-volatile organic compounds. Background technique [0002] In recent years, atmospheric environmental problems have become prominent, among which aerosol and ozone pollution are serious problems. Volatile organic compounds and semi-volatile organic compounds are not only important sources of secondary organic aerosols, but also important precursors for the formation of ozone. In addition to volatile organic compounds (Volatile Organic Compounds, VOCs), there are also semi-volatile organic compounds (Semi-organic Compounds, SVOCs) with larger molecular weight and more complex molecular structure. Semi-volatile organic compounds are an important class of environmental pollutants, especially for the formation of secondary organic aerosols (Secondary Organic Aerosol, SOA) in the atmospher...

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Problems solved by technology

In recent years, gaseous semivolatile organic compound measurement technology has been developed, such as dual-channel SV-TAG, which captures all gaseous and particulate semivolatile organic compounds through metal filter membranes, and compares the total semivolatile organic compound content with The content of gaseous semi-volatile organic compounds is obtained by difference calculation of the content of particulate semi-volatile organic compounds. The content of gaseous semi-volatile organic compounds obtained by the difference method has the problem of large gas particle distribution errors

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