Volatile flux measuring device and method for volatile organic compounds of pollution site

Abstract

The invention provides a volatile flux measuring device and method for volatile organic compounds of a pollution site. The device comprises a flux test cavity, wherein the flux test cavity is in a cylindrical structure with a closed top and an open bottom; a gas mixer, a power supply box, a pressure meter and a thermometer are connected with the external part of the flux test cavity; a plurality of air inlets are formed on the gas mixer, and the air inlets are connected with sampling holes, which are distributed all over the flux test cavity, through sampling tubes; an air outlet of the gas mixer is sequentially connected with an adjusting valve, a flowmeter, a sample collecting tube and a sampling pump through pipelines; and the measurement end of the pressure meter and the measurement end of the thermometer extend to the inside of the flux test cavity. The device and method can directly measure the volatile flux of volatile organic compounds in the site on site, and has the advantages of simple structure, accurate detection result and low cost, and is convenient to mount.

Description

technical field [0001] The invention belongs to the field of health risk assessment of polluted sites, and in particular relates to a measuring device for volatile organic compounds in polluted sites and a measuring method for the device. Background technique [0002] At present, the health risk assessment of volatile organic pollution in contaminated sites is mainly based on the concentration of volatile organic compounds in the soil. The RBCA_toolkit software is used to simulate and predict the exposure concentration and health risks of the population under different exposure situations. However, the evaluation results of a large number of engineering practices at home and abroad show that the risk results of adopting this method are too conservative, and the final restoration goals are too strict, resulting in high restoration costs. [0003] In order to overcome this problem caused by the use of RBCA_toolkit, the method of direct on-site monitoring can be combined with t...

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Problems solved by technology

[0005] The present invention provides a device and method for measuring the volatile flux of volatile organic compounds in polluted sites. It is necessary to solve the technical problems that the risk results of existing methods for calculating volatile organic compounds in the soil of polluted sites are too conservative, the restoration target is too strict, and the restoration cost is relatively high; And solve the technical problems that the existing volatile matter collection box is not suitable for the determination of the volatile flux of soil volatile organic compounds, the sample gas cannot be fully mixed, the detection efficiency is low, the measurement results are inaccurate, and the device is inconvenient to install and disassemble

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