Volatile organic compound gas monitoring system based on modified siloxane film

Abstract

The invention discloses a volatile organic compound gas monitoring system based on a modified siloxane film, and relates to the technical field of atmospheric environment monitoring. A monitoring system is formed by sequentially connecting a gas inlet 1, a gas selective permeable membrane 2, a sampling unit 3, a detection unit 4 and a gas outlet 5 through pipelines. Ambient air reaches the surface of the gas selective permeable membrane 2 from the gas inlet 1, VOCs in the ambient air selectively permeate through the separation layer 2-1 of the gas selective membrane based on different modified siloxane materials of the separation layer 2-1, enter the sampling unit 3 of the volatile organic compound monitoring system, and reach the detection unit 4 of the volatile organic compound monitoring system after being collected and sampled. the concentration of the VOCs to be detected is obtained; and after detection, the VOCs are discharged through the gas outlet 5. By switching the gas selective permeation membranes, selective permeation of different types of VOCs is achieved, and the defects that an existing monitoring system is not high in selectivity and high in monitoring target species replacement cost are effectively overcome.

Description

technical field [0001] The invention relates to the technical field of atmospheric environment monitoring, and specifically refers to a modified siloxane membrane, which selectively passes through volatile organic compounds of different properties by changing the siloxane end group, and realizes environmental protection by switching different modified membranes. A selective monitoring system for volatile organic compounds in the air. Background technique [0002] In recent years, with the development of economy and society, the problem of air pollution has become increasingly obvious. As one of the primary sources of air pollution, the emission of volatile organic compounds (VOCs) has drawn more and more attention from the government and people. With the gradual development and attention of air pollution monitoring work, the monitoring technology of volatile organic compounds has developed very rapidly. [0003] The current handheld photoionization detector (PID) gas senso...

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Problems solved by technology

[0003] The current hand-held photoionization detector (PID) gas sensor can only measure the total amount of VOCs, cannot distinguish the types of substances measured, cannot realize the selective monitoring of substances, and the measurement is greatly affected by the ambient humidity

Gas chromatography-hydrogen ion flame ionization detector (GC-FID) or gas chromatography-mass spectrometer (GC-MS) can distinguish the types of substances when monitoring VOCs, but cannot achieve selective monitoring, and mutual interference between multiple VOCs may occur , and the measurement is also affected by the ambient humidity

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