A kind of adsorption sampling device and method

Abstract

An adsorption sampling device and an adsorption sampling method are disclosed. The device comprises a main control module, a dehumidifying module, a temperature control module, a flow velocity control module and a sampling pipe. The main control module is separately connected to the dehumidifying module, the temperature control module and the flow velocity control module and is used for controlling the modules to work. The dehumidifying module is used for removing excess water in sampled gas flowing through the sampling pipe. The temperature control module is used for controlling temperature of the sampled gas flowing through the sampling pipe to make the temperature constant. The flow velocity control module is used for controlling the flow velocity of the sampled gas flowing through the sampling pipe to make the flow velocity constant. The sampling pipe is used for adsorbing compounds to be detected in the sampled gas at the constant temperature and the constant flow velocity, wherein a gas path where the sampled gas flows in the sampling pipe is closed. An adsorption sampling process is performed under constant and unified conditions, thus eliminating interferences of humidity and temperature to an adsorption rate and ensuring stability and accuracy of adsorption sampling results.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to an adsorption sampling device and method. Background technique [0002] The rapid development of basic industries has brought huge economic benefits, but also increased the burden on the environment. Now, the problem of environmental pollution has been paid more and more attention. [0003] There are many instruments for detecting air pollution and household pollution. The most widely used and most reliable detection method is gas chromatograph. Before testing, it is first necessary to carry out adsorption sampling of environmental samples, and then use gas chromatography for analysis and detection. This is the commonly used "adsorption analysis method", that is, adsorption tube sampling-thermal desorption / gas chromatography-mass spectrometry. [0004] The adsorption efficiency of pollutants is different under different temperature, humidity and air pressure environments. As a re...

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Problems solved by technology

As a result, when measurements are made at different times and in different locations, the measured values ​​may differ greatly from the actual values. It will affect the detection results, especially for the accuracy of PPB (Part Per Billion, one billionth) level detection requirements.

The existing adsorption sampling methods are relatively rough, and little consideration is given to the external environment

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