Active sampling system of pops substances at water-air interface and calculation method of volatile flux

Abstract

The invention discloses an active sampling system for water-air interface POPs (persistent organic pollutants) and a volatilization flux calculating method; a sampling device comprises a water-air gas collection module and a gas sample enrichment module; the water-air gas collection module comprises an organic glass barrel and a suspended balloon; the organic glass barrel is fixed in the suspended balloon, and the lower edge of the organic glass barrel overlaps with the lower edge of a suspending ring; the gas sample enrichment module comprises an SPE (solid phase extraction) column, a flow velocity meter, a vacuum pump, a first polytetrafluoroethylene pipe and a second polytetrafluoroethylene pipe; one end of the first polytetrafluoroethylene pipe is inserted into a rubber plug and into the SPE column, the other end of the first polytetrafluoroethylene pipe is connected to a gas sampling hole of the organic glass barrel; one end of the second polytetrafluoroethylene pipe is connected to one porous end of the SPE column through a silicone pipe, and the other end is connected to an inlet of the flow velocity meter; an outlet of the flow velocity meter is connected to the vacuum pump. The active sampling system is economical, efficient, portable and easy to operate, and has high sampling efficiency.

Description

technical field [0001] The invention relates to a sampling device, in particular to an active sampling system for POPs substances at the water-air interface and a calculation method for volatile flux. Background technique [0002] Persistent organic pollutants (POPs) have persistent, bioaccumulative, "three-caused" effects (carcinogenic, teratogenic, mutagenic) and environmental endocrine disruptors, which have a serious impact on human health. In order to effectively control and reduce persistent organic pollutants in environmental media, the international community signed the "Stockholm Convention" (Stockholm Convention) in 2001 and put it into practice in 2004. my country is a signatory to the Convention. The monitoring of POPs in environmental media is an indispensable and important step for compliance. [0003] After long-term migration, POPs substances settle into river and lake water mainly through three processes: diffusion, water-air gas exchange, and dry-wet depos...

AI Technical Summary

Problems solved by technology

[0006] (2) Factors such as fluidity, temperature, and wind direction of the water body greatly restrict the collection process. How to ensure the stability and sealing of the collection device is a problem that must be faced

This kind of active sampler uses a large-flow air pump to overcome the resistance of the adsorption material, which is expensive, bulky, and noisy during sampling, which limits its sampling of POPs in a specific environment; the process of extracting POPs from the adsorption material after sampling is complicated and difficult. It takes a long time and has high requirements for operators

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