Rapid detection device for Tessier ion exchange state hexavalent chromium in soil

Abstract

The invention discloses a rapid detection device for Tessier ion exchange state hexavalent chromium in soil. The rapid detection device comprises a soil hygrometer, a quantitative sampler, a dissolving chamber, a color developing tube and a chromaticity card, the dissolving chamber is communicated with the color developing tube through a peristaltic pump, the front end and the rear end of a hose of the peristaltic pump are respectively communicated to the dissolving chamber and the color developing tube, and the port of the front end of the hose is provided with a filter membrane; the quantitative sampler comprises a handle and a quantitative vessel at the front end of the handle, an isolating membrane is laid on the inner wall of the quantitative vessel, and the edge of the isolating membrane exceeds the upper edge of the quantitative vessel; a sample adding opening is formed in the top of the dissolving chamber, a MgCl2 aqueous solution is poured into the dissolving chamber, and the dissolving chamber is provided with a stirring device; a power supply is arranged on the side wall of the dissolving chamber; the peristaltic pump and the stirring device are connected to the power supply; and a color developing agent is poured in the color developing tube. The device is convenient to carry, and the content of the Tessier ion exchange state hexavalent chromium in the chromium-contaminated soil can be rapidly, timely and accurately obtained on the first site.

Description

technical field [0001] The invention relates to the technical field of chemical testing, in particular to a rapid detection device for Tessier ion-exchanged hexavalent chromium in soil. Background technique [0002] Chromium (Cr) ranks 6th on the EPA's list of priority pollutants. Cr is a common multivalent heavy metal element, which is mainly trivalent and hexavalent in the natural environment. Trivalent chromium is an essential trace mineral element for living organisms, actively participates in the life cycle of organisms, and is generally considered to be non-toxic and harmless to the natural environment. Hexavalent chromium is a recognized mutagen and strong carcinogen, which endangers the health of living bodies and the ecological balance of the environment. Therefore, the so-called "chromium pollution" generally refers to "hexavalent chromium pollution". [0003] With the development of China's chromium salt industry, the accumulation of chromium slag is increasing...

AI Technical Summary

Problems solved by technology

Among them, the ion exchange state (i.e. Tessier ion exchange state) is the most harmful to the environment. The detection of hexavalent chromium in the Tessier ion exchange state in soil is particularly important. As far as we know, the method for the determination of the ion exchange state of hexavalent chromium in soil It is relatively complicated, and the general process is: on-site collection of samples from chromium-contaminated soil→transportation to the laboratory→storage→weighing→magnesium ion exchange extraction→fractionation and constant volume→adjustment of pH→color development→spectrophotometric determination→calculation of content→feedback The results showed to the environmental remediation engineer, it can be seen that the process is cumbersome and time-consuming

During on-site remediation of chromium-contaminated sites, environmental remediation engineers cannot meet the expectations of the first site to quickly, timely and accurately obtain the content of Tessier ion-exchanged hexavalent chromium in chromium-contaminated soil

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