Electrochemical method for non-eletricity enriching and measuring trace amount tervalence inorganic arsenic in water system

A trivalent arsenic and electrochemical technology, applied in the direction of material electrochemical variables, can solve the problems of trivalent arsenic anti-interference detection and environmental protection impact, so as to improve reproducibility and utilization rate, avoid cumbersome steps, and improve response signal effect

Inactive Publication Date: 2009-01-21
NANJING UNIV
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Problems solved by technology

Generally speaking, the pre-enrichment process of stripping voltammetry uses constant potential deposition technology and its supporting electrolyte uses high-conc

Method used

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  • Electrochemical method for non-eletricity enriching and measuring trace amount tervalence inorganic arsenic in water system
  • Electrochemical method for non-eletricity enriching and measuring trace amount tervalence inorganic arsenic in water system
  • Electrochemical method for non-eletricity enriching and measuring trace amount tervalence inorganic arsenic in water system

Examples

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[0035] Example 1. Electrochemical detection method for electroless enrichment and determination of trivalent arsenic concentration in water system

[0036] 1. Use as figure 1 In the three-electrode electrochemical system shown, the gold disk electrode (4) is polished on silicon carbide fine sandpaper before the experiment, and then polished into a "mirror" with suede with 0.3μm and 0.05μm alumina suspension respectively. Finally, it is cleaned by ethanol and second water ultrasonic cleaning for use.

[0037] 2. In the process of preparing the gold nano film, first put a magnetic stirrer (3) in the electrochemical detection cell (2) and place it on the magnetic stirrer (1). Fix the gold electrode (4), the reference electrode (5), and the counter electrode (6) in appropriate positions, insert the bottom end into the detection cell (2), and add 2 mL of 0.01M phosphate buffer. Each electrode is connected to the electrochemical workstation (7) used, and the electrochemical workstation...

Example Embodiment

[0046] Example 2. Electrochemical detection method for electroless enrichment and determination of the concentration of trivalent arsenic in a water system containing interfering copper ions

[0047] 1. Use as figure 1 In the three-electrode electrochemical system shown, the gold disk electrode (4) is polished on silicon carbide fine sandpaper before the experiment, and then polished into a "mirror" with suede with 0.3μm and 0.05μm alumina suspension respectively. Finally, it is cleaned by ethanol and second water ultrasonic cleaning for use.

[0048] 2. In the process of preparing the gold nano film, first put a magnetic stirrer (3) in the electrochemical detection cell (2) and place it on the magnetic stirrer (1). Fix the gold electrode (4), reference electrode (5), and counter electrode (6) in appropriate positions, insert the bottom end into the detection cell (2), and add 2 mL of 0.2M phosphate buffer. Each electrode is connected to the electrochemical workstation (7) used, ...

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Abstract

The invention relates to an electrochemical detection method for measuring the concentration of trivalent arsenic in a water system without electricity enrichment, which comprises utilizing a three-electrode system which is formed by a gold electrode, a reference electrode and a counter electrode to oxygenize the surface of the gold electrode to be gold trioxide in a detection pool, immersing gold trioxide into beta-D-glucose solution, deacidizing gold trioxide to be a nano-gold film, immersing gold electrode into 0.1M phosphate buffer solution (the concentration detecting range is 10.0nM-5.0muM) which is contained with trivalent arsenic under test, adsorbing trivalent arsenic through the nano-gold film, leading arsenic to be enriched on the surface of the nano-gold film, inserting the gold electrode and the reference electrode which are enriched with arsenic into the electrochemical detection tank, starting an electrochemical working station to scan, leading arsenic which is enrichedin the process of scanning to do redox reaction on the surface of the gold electrode, getting the oxidation peak current value which has corresponding relationship with trivalent arsenic, thereby measuring the concentration of arsenic solution, achieving the detection of trivalent arsenic in high sensitivity, and solving the problem of applying high-concentration acid medium.

Description

technical field [0001] The invention relates to an electrochemical detection method for trivalent inorganic arsenic. Background technique [0002] Arsenic is a toxic substance widely distributed on the surface of the earth's crust. Arsenic exists mainly in trivalent and pentavalent forms in water systems, and trivalent inorganic arsenic is the most toxic. Studies have shown that long-term drinking of water with excessive arsenic content will greatly increase the chances of suffering from skin cancer, lung cancer, bladder cancer and other cancers. Therefore, in-depth research on the analysis method of arsenic content in water samples is of great significance for environmental monitoring and human health. In recent decades, techniques such as electrochemistry, spectroscopy, and mass spectrometry have been widely used in the detection of arsenic. Among them, the electrochemical method has received extensive attention in the determination of inorganic arsenic due to its simpli...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/30
Inventor 徐静娟都颖赵微陈洪渊
Owner NANJING UNIV
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