Field fast detection method for heavy metal ions in water

A heavy metal ion and detection method technology, which is applied in the field of environmental monitoring or chemical analysis, can solve problems such as difficulty in distinguishing metal ions, expensive detection instruments, and influence on detection results, and achieve high stability, good repeatability, and convenient portability or online The effect of on-site rapid detection and analysis

Inactive Publication Date: 2010-09-22
EAST CHINA UNIV OF SCI & TECH
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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

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  • Field fast detection method for heavy metal ions in water
  • Field fast detection method for heavy metal ions in water
  • Field fast detection method for heavy metal ions in water

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Embodiment Construction

[0038] Below in conjunction with the accompanying drawings, the specific implementation of the on-site rapid detection method for heavy metal ions in water of the present invention is given, but the implementation of the present invention is not limited to the following examples, all equivalent changes or adaptations made according to the method of the present invention All should be regarded as the scope of protection of the present invention.

[0039] See attached figure 1 .

[0040] The on-site rapid detection method of heavy metal ions in water mainly comprises the following steps:

[0041] (1) Electrochemical enrichment of metal ions

[0042] Place the screen-printed electrode in the sample containing unknown concentration of Pb 2+ In the aqueous solution of ions, metal ions were enriched using a current-time curve, wherein the enrichment voltage was set to -1.0V, and the enrichment time was set to 400 seconds. A schematic diagram of the current-time curve during meta...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 龙亿涛李大伟李萌宋伟李扬李原婷
Owner EAST CHINA UNIV OF SCI & TECH
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