Method for detecting trace amount mercury ion by platinum microelectrode and reference electrode

A reference electrode and mercury ion technology, applied in the direction of material electrochemical variables, etc., can solve the problems of high cost of inductively coupled plasma mass spectrometry, unsuitable for routine analysis, expensive instruments, etc., achieve good selective detection effect, reduce impurities Scattered and correlated interference, high sensitivity effect

Inactive Publication Date: 2011-10-05
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cold atomic absorption method and cold atomic fluorescence method have high sensitivity and precision, but the operation is cumbersome, the required instruments are expensive, and the test cost is high
Inductively coupled plasma mass spectrometry is also very expensive and not suitable for routine analysis

Method used

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  • Method for detecting trace amount mercury ion by platinum microelectrode and reference electrode
  • Method for detecting trace amount mercury ion by platinum microelectrode and reference electrode
  • Method for detecting trace amount mercury ion by platinum microelectrode and reference electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 (preparation and treatment of electrodes)

[0020] (1), the instruments and reagents used in this example

[0021] Scanning electrochemical microscope (CHI900, CH Instruments, USA) was used for anodic voltammetry experiments, Ag / AgCl reference electrode (CHI111, CH Instruments, USA), quartz tube heated automatic double pure water distiller (1810B, Shanghai Asia Pacific) Technical Glass Company) for the distillation of doubly distilled water. Electronic balance (Beijing Sartorius Instrument Co., Ltd.) for weighing medicines. ML-902 magnetic stirrer (Shanghai Pujiang Analytical Instrument Factory) aluminum oxide polishing powder (0.30μm, 0.05μm, Shanghai Chenhua Instrument Reagent Co., Ltd.) is used to process platinum microelectrodes, Ag / AgCl is the reference electrode, Hg 2+ Concentration of standard solution 10 -4 mol.L, Cu 2+ Concentration of standard solution 10 -4 mol.L, potassium nitrate (Xi'an Chemical Reagent Factory).

[0022] (2) Preparation of ...

Embodiment 2

[0030] Embodiment 2 (interference experiment of copper ion)

[0031] containing equal concentrations of Hg 2+ , Cu 2+ 1×10 -7 mol.L -1 ~5×10 -11 mol.L -1 The solution was charged with nitrogen and deoxygenated for 30min, deposited with a voltage of 0V for 15s under stirring by a magnetic stirrer, and then the two electrodes were taken out and placed in a 0.1mol.L deoxygenated solution. -1 In potassium nitrate solution, the potential range is 0.0~0.6V and the sweep speed is 0.01V.s -1 linear scan. Figure 4 It is the dissolution voltammetry curve (ASV) after mixing the two ions: curves 1, 2, 3, 4, and 5 are the concentration of 1 × 10 -7 mol.L -1, 1 × 10 -8 mol.L -1 , 1 × 10 -9 mol.L -1 , 1 × 10 -10 mol.L -1 , 1 × 10 -11 mol.L -1 Hg 2+ , Cu 2+ Dissolution voltammetry curves of mixed solutions of standard solutions. at 10 -7 mol.L -1 ~10 -11 mol.L -1 The anodic peak of mercury ions is obvious at around 0.30V, while the anodic peak of copper ions is almost ...

Embodiment 3

[0032] Example 3 (test)

[0033] With the working curve obtained in Example 1, replace Hg with the sample to be tested (the laboratory tap water sample of this unit) 2+ In the standard solution, the anodic dissolution peak current was measured according to the method of Example 1, and the mercury content was calculated from the D Zuo curve at 3.2 × 10 -8 mol.L -1 the following.

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Abstract

The invention discloses a method for detecting trace mercury ions through utilizing a platinum microelectrode and a reference electrode, which comprises three steps: firstly, preparing mercury ion solution, secondly, electrically settling mercury ions on the surface of a platinum round disc microelectrode in 0V, thirdly, leading the mercury irons to do linear sweep in 0.0V-0.6V voltage, and dissolving out mercury anodes. The method simplifies an experimental design, which has high sensitivity, and can dramatically detect the mercury iron concentration which is lowered to 10<-11> mol.L>-1. The method has excellent detecting effect to the selectivity of mercury irons when the concentration is low, and effectively removes the disturbance of copper ions. The invention has the advantages of low detection limit, convenient operation, novel method and low production cost. The method is used to measure trace mercury ions in the mixed solution of mercury ions and metallic ions, which has application prospect.

Description

technical field [0001] The invention relates to a method for detecting trace mercury ions by anodic stripping voltammetry based on a two-electrode system composed of a platinum ultrafine electrode and a reference electrode. technical background [0002] Ultrafine electrode testing technology is a frontier field of electrochemistry and electroanalytical chemistry developed in the late 1970s. As an important testing technology, it has shown its superiority in application. Mercury is a heavy metal that is harmful to human health. Mercury ions will be deposited in the brain, liver and other organs, resulting in chronic poisoning, damage to the kidneys, brain, stomach and intestines, and even cause death; in addition, mercury and its compounds can pass through the skin. Absorbed, causing diseases such as stomatitis, gingivitis, and neurological disorders; mercury poisoning can have extremely bad effects on society as a whole, and now mercury is prioritized on the Global Environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/48G01N27/30
Inventor 卢小泉李秀娟南米娜廖天录王晓燕
Owner NORTHWEST NORMAL UNIVERSITY
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