Device and method for observing trace volatile organic compounds in atmosphere in online manner

Abstract

The invention discloses a device and a method for observing trace volatile organic compounds in atmosphere in an online manner, and relates to detection of volatile organic compounds in atmosphere. The device is provided with a six-way valve, a drying pipe, a mass flow controller, an air pump, a refrigerating sheet, a heating sleeve, a collecting trap, a circulating water radiating system, screen cloth, a drying pipe flow control valve, a flow control valve and a gas-phase chromatography sample injection six-way valve. Air samples can be fed into the collecting trap via the screen cloth, the air pump, the mass flow controller, the drying pipe and the six-way valve sequentially, the heating sleeve sleeves the collecting trap, the radiating sheet is arranged on the outer periphery of the heating sleeve, an inlet of the drying pipe flow control valve is externally connected with an N2 source, an outlet of the drying pipe flow control valve is connected with an inlet of the drying pipe, an inlet of the flow control valve is connected with an outlet of the gas-phase chromatography sample injection six-way valve and the N2 source, an outlet of the flow control valve is connected with the six-way valve, the gas-phase chromatography sample injection six-way valve is externally connected with a gas-phase chromatography pulse flame photometric detector, and the gas-phase chromatography pulse flame photometric detector is externally connected with an H2 source and a purified air source.

Description

technical field [0001] The invention relates to the detection of volatile organic compounds in the atmosphere, in particular to a device and method for online observation of trace volatile organic compounds in the atmosphere. Background technique [0002] In recent years, air pollution has become a prominent environmental problem that has aroused people's widespread concern and has an important impact on human living environment and physical health. Volatile organic compounds in the atmosphere are an important indicator affecting air quality, and long-term continuous observation of them is of great significance for ensuring atmospheric air quality. [0003] When the concentration of volatile organic compounds in the atmosphere is high, the concentration level is ppm or ppb level, and the existing observation technology can directly measure it. However, when the concentration of volatile organic compounds in the atmosphere is low, the concentration level is ppt level or belo...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the existing technical problems of continuous on-line observation of trace volatile organic compounds in the atmosphere, provide a device that can realize fast electronic refrigeration and electric heating, and continuously and automatically observe trace volatile organic compounds in the atmosphere at the investigation site A device and method for online observation of atmospheric trace volatile organic compounds

Images