Field fast detection method for heavy metal ions in water

Abstract

The invention belongs to the technical field of environmental monitoring or chemical analysis, and relates to a field fast detection method for heavy metal ions in water, which combines an electrochemical extraction technology and a spectral analysis technology together. The method mainly comprises the following steps: (1) electrochemically enriching the metal ions; (2) electrochemically dissolving out the enriched metal; (3) carrying out development analysis on the metal ions: 1) selecting a developer, 2) determining development conditions and 3) drawing standard absorption curves; and (4) determining the kind and concentration of the heavy metal ions. The invention has the following positive effects: the defect of difficult distinction between the metal ions at adjacent oxidation-reduction potentials by the conventional electrochemical method is overcome; the influence of higher dirty color degree in polluted water body and other complexity factors on the spectrophotometry result is avoided; spectrophotometry result has high-stability and good-repeatability, thus be capable of conveniently realizing the portability or online field fast detection analysis of the heavy metal ions in polluted samples; and the detection sensitivity can reach less than 0.1 ppm.

Description

【Technical field】 [0001] The invention belongs to the technical field of environmental monitoring or chemical analysis, and relates to a method for on-site rapid detection of the types and contents of heavy metal ions in water, in particular to the on-site rapid detection of heavy metal ions in water pollution accidents by using electrochemical and spectroscopic techniques Methods. 【technical background】 [0002] The mining, smelting, processing and commercial manufacturing activities of heavy metals in human society are increasing day by day, and sudden water heavy metal pollution accidents caused by accidental leakage, illegal discharge and other reasons occur from time to time. Heavy metals are highly toxic, difficult to be metabolized in the environment, easy to be enriched by organisms and have biomagnification effects, etc., which not only pollute the water environment, but also seriously threaten the survival of humans and aquatic organisms. In order to understand th...

AI Technical Summary

Problems solved by technology

Among them, spectrophotometry has certain requirements on the turbidity and chromaticity of the tested samples, and test samples with high turbidity or high chromaticity will have a great impact on the test results

Anodic stripping voltammetry is difficult to distinguish metal ions with similar oxidation-reduction potentials, and cannot achieve accurate qualitative and quantitative analysis

The detection instruments used in portable ion chromatography are relatively expensive, but the types of heavy metal ions that can be detected are limited

Therefore, the application of the above detection technologies is limited and cannot fully meet the requirements of on-site emergency detection.

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