Electrochemical method for detecting microscale and trace arsenic and heavy metals by carbon material modified working electrode

A technology of working electrodes and carbon materials, applied in the field of electrochemical analysis and detection, to achieve the effects of easy access, simple testing process, and short testing time

Pending Publication Date: 2017-09-01
BAISE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a carbon material modified working electrode for detecting trace and trace arsenic and heavy metals in the process of detecting trace and trace arsenic and heavy metals in the current electrochemical method. chemical method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Working electrode preparation: 5 mg of carbon black was added to 2 mL of ethanol and ultrasonically dispersed for 40 minutes, sealed and stored for later use. Ultrasonic dispersion was uniform before each use, and 6 uL (15 ug) suspension was drawn with a micro-sampler and dropped onto the surface of the polished glassy carbon electrode. After standing at room temperature and drying, 2 uL of DuPont membrane solution (DuPont 5% nafion solution) to the surface of the electrode and let it dry naturally before use.

[0018] Differential pulse stripping voltammetry was used for electrochemical detection, and the parameters were as follows: enrichment potential -0.8V, enrichment time 700s, buffer solution was acetic acid / sodium acetate solution with pH=4.5.

[0019] Join Bi 3+ When the molar ratio of ions to lead ions to be measured is 20, when the carbon black modified working electrode detects heavy metal lead, the concentration of lead ions and the stripping peak current h...

Embodiment 2

[0021] Preparation of working electrode: 20 ug of graphite powder in isopropanol solution was drop-coated on the polished glassy carbon electrode, and 2 uL of DuPont 5% nafion solution was added dropwise to the surface of the electrode, and then dried naturally for use.

[0022] Differential pulse stripping voltammetry was used for electrochemical detection, and the setting parameters were the same as in Example 1.

[0023] Join Bi 3+ When the molar ratio of ions to lead ions to be measured is 50, when the carbon black modified working electrode detects heavy metal lead, the concentration of lead ions and the stripping peak current have a wide linear range and high sensitivity. .

Embodiment 3

[0025] Preparation of working electrode: 20 ug of activated carbon in isopropanol solution was drip-coated on the polished glassy carbon electrode, and 3 uL of DuPont 5% nafion solution was added dropwise to the surface of the electrode, and it was left to dry naturally before use.

[0026] Electrochemical detection adopts square wave stripping voltammetry, and the main parameters are set as follows: enrichment potential -0.8V, enrichment time 700s, frequency 15Hz, amplitude 0.025V, gain 0.004V, buffer solution is acetic acid / sodium acetate with pH=4.5 solution.

[0027] Join Bi 3+ When the molar ratio of ions to lead ions to be measured is 50, when the carbon black modified working electrode detects heavy metal lead, the concentration of lead ions and the stripping peak current have a wide linear range and high sensitivity.

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Abstract

The invention relates to an electrochemical method for detecting microscale and trace arsenic and heavy metals by a carbon material modified working electrode and belongs to the fields of food, health, environmental monitoring and the like. According to the invention, a working electrode is modified mainly by the utilization of a common carbon material such as graphite, carbon black, active carbon and the like, and microscale and trace arsenic and heavy metals undergo quantitative analytical determination by anodic stripping voltammetry. The working electrode only needs to be coated with the carbon material for direct testing. By adding microscale nafion or adding a proper amount of bismuth ions into a solution to be tested, sensitivity of the working electrode can be greatly raised. The electrode modification material is cheap and easily available. The modification process is simple and fast, and one or more microscale and trace arsenic and heavy metals can be rapidly detected at the same time. Sensitivity is high; performance is stable; and detection limit is low. The method has a very good promotion and application prospect. The carbon material is the first choice as an actual working electrode coating material for the electrochemical method for rapidly detecting microscale and trace arsenic and heavy metals.

Description

technical field [0001] The invention relates to the fields of electrochemical analysis and detection of food, sanitation, environment, etc., in particular to an electrochemical method for detecting trace and trace amounts of arsenic and heavy metals with a working electrode modified by carbon materials. Background technique [0002] Heavy metal pollution directly endangers human health and leads to deterioration of environmental quality, especially the five metals including lead, mercury, cadmium, chromium and metalloid arsenic are the most harmful. Compared with other methods such as atomic absorption spectrometry, atomic fluorescence method, ultraviolet-visible spectrophotometry, X-ray fluorescence spectrometry, inductively coupled plasma mass spectrometry, electrochemical detection of heavy metal elements has the advantages of simple equipment, convenient operation and high sensitivity. , has important application value in food, hygiene, environment and other fields. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/308G01N27/48
Inventor 谢瑞刚兰翠玲周伶俐范方方杨途才谭宏宇
Owner BAISE UNIV
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