An Electrochemical Method for Detecting Trace Mercury Ions
A mercury ion and electrochemical technology, applied in the field of electrochemical analysis and detection, can solve the problems that restrict the application and popularization of trace mercury ion detection, and the electrode does not significantly improve the detection sensitivity, so as to achieve low detection cost, simple and fast detection process, good The effect of the current response
Active Publication Date: 2020-09-01
XIAMEN UNIV
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Problems solved by technology
Some electrochemical methods for detecting the concentration of mercury ions in water disclosed in the prior art mainly focus on the preparation and application of new working electrodes, but these electrodes do not significantly improve the detection sensitivity, which restricts the application of electrochemical methods to detect trace mercury ions Popularize
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Embodiment 1
[0027] Such as figure 1 Shown, an electrochemical method for detecting trace amounts of mercury ions, comprising the following steps:
[0028] (1) Place a working electrode, a reference electrode and a counter electrode in the electrolytic cell to form a three-electrode system, and connect it to an electrochemical analysis device; the working electrode is a gold film electrode, the counter electrode is a platinum electrode, and the reference electrode is a calomel electrode ;
[0029] (2) Add a standard electrolyte in the electrolytic cell, which has a concentration of 0.05 to 10 μg / L of mercury ions, hydrochloric acid and bromide (added in the form of sodium bromide) dissolved in the electrolyte, wherein the concentration of hydrochloric acid is 0.1M, The concentration of halogen / halogenoid is 0.01M;
[0030] (3) Electrodeposit the mercury ions in the above solution on the surface of the working electrode, stir at a speed of 100-1500rpm during the electrodeposition process,...
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The invention discloses an electrochemical method for detecting trace mercury ions. The electrochemical method includes the steps: (1) placing a working electrode, a reference electrode and a counterelectrode into an electrolytic tank to form a three-electrode system, and connecting the three-electrode system into an electrochemical analysis device; (2) adding hydrochloric acid solution containing halogen ions / halogenoid ions with a certain concentration into the electrolytic tank to serve as electrolyte, and then adding mercury ion standard solution; (3) electro-depositing mercury ions in the solution on the surface of the working electrode under negative potential, reversely stripping the mercury ions by anodic stripping voltammetry, recording the stripping peak potential and the peak current value of the mercury ions, and drawing a standard curve according to the corresponding peak current value of different mercury ion concentration; (4) adding a sample to be tested into the electrolytic tank, acquiring data according to steps and parameters identical with those in the step (3), and substituting the data into a linear equation of the standard curve to obtain the concentrationof the mercury ions in the sample to be tested. As the halogen ions / halogenoid ions are led into the electrolyte, detection sensitivity is improved, detected electrochemical signals keep excellent current response, and the electrochemical method has good stability and repeatability.
Description
technical field [0001] The invention belongs to the technical field of electrochemical analysis and detection, and in particular relates to an electrochemical method for detecting trace mercury ions. Background technique [0002] Heavy metal mercury is a harmful environmental pollutant, which can be enriched in organisms through the food chain and directly endanger human health and lead to environmental quality deterioration. The detection methods of mercury ions include atomic absorption spectrometry, atomic fluorescence and inductively coupled plasma mass spectrometry. their wide application. Therefore, exploring simple, fast, cost-effective and on-line monitoring mercury detection methods has become one of the important research directions in the fields of food, hygiene and environmental analysis. [0003] Electrochemical stripping voltammetry has the advantages of simple operation, high sensitivity, low detection cost, and fast analysis speed. It has great potential in...
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IPC IPC(8): G01N27/26G01N27/333
CPCG01N27/26G01N27/333
Inventor 刘国坤邹义松卢江龙郑红王炬勇张玉龙田中群
Owner XIAMEN UNIV