An integrated adsorption tube for benzene and total volatile organic compounds in indoor air and its detection method

Abstract

The invention relates to an integrated adsorption tube for benzene and total volatile organic compounds in indoor air and a detection method thereof, comprising an adsorption tube capable of simultaneously collecting samples of benzene and total volatile organic compounds, and Tenax-TA Adsorbent, coconut shell activated carbon adsorbent and Tenax-TA adsorbent, the adsorption tube of the present invention can simultaneously sample benzene and total volatile organic compounds in indoor air, and can use the benzene data in the analysis results of total volatile organic compounds As the structure of benzene analyzed separately, the detection result has good reproducibility, the recovery rate of benzene and total volatile organic compounds is high, the detection cost is reduced, and the experiment is convenient.

Description

technical field [0001] The invention relates to a gas sampling tube and a detection method thereof, in particular to an integrated adsorption tube for benzene and total volatile organic compounds in indoor air and a detection method thereof. Background technique [0002] At present, the domestic detection of benzene and TVOC (total volatile organic compounds) in indoor air has relevant provisions and standards in GB50325-2001 (2006 edition) "Code for Control of Indoor Environmental Pollution in Civil Construction Engineering". Among them, the benzene and TVOC sampling adsorption tubes and experimental methods are stipulated separately. The benzene detection data cannot be used in the TVOC analysis results. Benzene is not feasible as a separate analysis result of benzene (no longer sampling and analyzing with activated carbon adsorption tube), the reason is: although the Tenax-Ta adsorption tube has a good adsorption effect on VOCS, the adsorption effect on benzene is shown t...

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Problems solved by technology

Among them, the benzene and TVOC sampling adsorption tubes and experimental methods are stipulated separately. The benzene detection data cannot be used in the TVOC analysis results. Benzene is not feasible as a separate analysis result of benzene (no longer sampling and analyzing with activated carbon adsorption tube), the reason is: although the Tenax-Ta adsorption tube has a good adsorption effect on VOCS, the adsorption effect on benzene is shown to increase with the change from low temperature to high temperature. As the temperature increases, the adsorption decreases rapidly, that is to say, when the Tenax-Ta adsorption tube is used to sample at normal room temperature (20°C-30°C), benzene will penetrate the adsorption tube and lose a large amount, and the measured value will be greatly reduced. This conclusion Refer to the research data and conclusions of senior engineer Zhang Tianlong of Shanghai University

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