Online pre-separation and enrichment device for pollutants in large-volume water sample

Abstract

The invention discloses an online pre-separation and enrichment device for pollutants in a large-volume water sample. The device is formed by connecting a shell-and-tube-type hollow fiber ultra-filtration membrane component, a shell-and-tube-type hollow fiber separation enrichment device, flow adjustment valves of each pipeline, a peristaltic pump and a liquid collection bottle through pipelines. According to the device, the transportation and the carrying of the large-volume water sample are reduced; the device is not required to be guarded by human; multi-point sampling detection and field treatment can be realized; the cost of manpower and the cost of materials are reduced; the device is convenient to popularize and use in each environment monitoring station.

Description

technical field [0001] The invention belongs to the field of water quality monitoring, in particular to an online pre-separation and enrichment device for pollutants in large-volume water samples. Background technique [0002] In water quality monitoring, on-site water sampling is a very important and critical task. According to the relevant national standards for water sample collection, multi-point sampling is often required at representative locations, so the number of samples is usually large. The collected samples are limited by transportation, storage and other factors, so the amount of collected samples usually cannot be too large. For some pollutants (persistent organic pollutants), due to their low concentration in water and the limitation of instrument detection conditions, it is often difficult to detect pollutants in laboratory analysis of these water samples, thus affecting Regulation and control of certain persistent organic pollutants. [0003] Aiming at th...

AI Technical Summary

Problems solved by technology

This method can indeed improve the detection range of the concentration of pollutants in water samples, but there is also the problem that the amount of water samples collected is too large, and the place where the water samples are collected is far away from the analysis laboratory, thus increasing the labor intensity of sampling and increasing the number of samples. acquisition cost

[0004] In addition, so many water samples collected need to undergo multiple liquid-liquid extractions, which not only consume a large amount of volatile organic solvents, but also The pollutants need to be transferred many times, and the result is easy to cause the loss of pollutants, which leads to the problem of inaccurate detection of pollutant concentration in water.

More importantly, the use of a large amount of volatile organic solvents can easily cause secondary pollution to the environment. Therefore, there is an urgent need for a new device for the pretreatment of large volumes of water samples. It is best to achieve on-site sampling and on-site pretreatment. There is no need or fewer sample transfers, and the separated and enriched samples can be directly analyzed by the instrument after a little simple treatment

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