Electrochemical method for detecting micro-arsenic and trace arsenic and heavy metal by composite material modified working electrode

A composite material and working electrode technology, applied in the field of electrochemical analysis and detection, to achieve the effect of simple test process, improved detection range and short test time

Inactive 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 graphene / g-C for the shortcomings of the practical application of working electrode selection in the current electrochemical method for detecting trace and trace arsenic and heavy metals. 3 N 4 An electrochemical method for the detection of trace arsenic and trace arsenic and heavy metals using a composite material modified working electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Working electrode preparation:

[0018] Mix melamine and graphene according to a certain mass ratio, grind them thoroughly and calcinate at 600°C, and cool to room temperature after 3 hours. Add a certain volume of absolute ethanol, ultrasonically disperse for 40 minutes, and seal for later use. Sonicate for 20 minutes before each use, use a micro-sampler to extract 6 uL (15 ug) of the suspension and drop it on the surface of the polished glassy carbon electrode. After standing at room temperature and drying, add 2 uL of DuPont membrane solution (DuPont 5% nafion solution) to the electrode surface. Join Bi 3+ When the molar ratio of ion to lead ion to be measured is 20, graphene / g-C 3 N 4 When the working electrode modified by composite materials detects lead, the linear relationship between the concentration of lead ions and the dissolution peak current is good, and the detection limit is low.

Embodiment 2

[0020] Preparation of working electrode: Add graphene oxide into aqueous urea solution, ultrasonically dissolve, dry at 80°C, and put it into a muffle furnace. Calcined at 550°C for 3 hours, then cooled down to room temperature naturally. Take 15 ug of graphene / g-C 3 N 4 The isopropanol solution of the composite material was drip-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 it was left to dry naturally before use.

[0021] The electrochemical detection adopts differential pulse stripping voltammetry, and the setting parameters are as follows: enrichment potential -0.8V, enrichment time 700s, buffer solution is acetic acid / sodium acetate solution with pH=4.5.

[0022] 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 has a linear relationship with the...

Embodiment 3

[0024] Working electrode preparation:

[0025] Mix and grind urea and reduced graphene in proportion, and then calcinate at high temperature to obtain g-C 3 N 4 / C composite material. 15ug graphene / g-C 3 N 4 The isopropanol solution of the composite material was drip-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 it was left to dry naturally before use.

[0026] The electrochemical detection adopts differential pulse stripping voltammetry, and the setting parameters are as follows: enrichment potential -0.8V, enrichment time 700s, buffer solution is acetic acid / sodium acetate solution with pH=4.5.

[0027] 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 has a linear relationship with the dissolution peak current, and the detection limit is low.

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Abstract

The invention relates to an electrochemical method for detecting micro-arsenic, trace-arsenic and heavy metal by a composite 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 composite material formed by a common carbon material and g-C3N4, and micro and trace arsenic and heavy metal ions undergo quantitative analytical determination by anodic stripping voltammetry. The working electrode only needs to be coated with a graphene/g-C3N4 composite material for directly testing. Microscale nafion is added or bismuth ion is added into a solution to be tested. Then, detection limit of arsenic and heavy metal ions can be obviously raised. The electrode modification process is simple and fast; sensitivity is high; performance is stable; and microscale and trace arsenic and heavy metal ions can be detected rapidly. The method of the invention has a great promotion and application prospect.

Description

technical field [0001] The invention relates to the fields of electrochemical analysis and detection of food, sanitation, environment, etc., in particular to a g-C 3 N 4 An electrochemical method for the detection of trace arsenic and trace arsenic and heavy metals using a working electrode modified with / C composites. Background technique [0002] Heavy metal pollution directly endangers human health and leads to deterioration of environmental quality, among which the five types of lead, mercury, cadmium, chromium, and arsenic are the most harmful. Compared with some large-scale instruments for detecting heavy metals, such as atomic absorption spectrometry, atomic fluorescence, ultraviolet-visible spectrophotometry, X-ray fluorescence spectrometry, and inductively coupled plasma mass spectrometry, electrochemical methods are obviously more simple, easy to operate, and sensitive. High advantages, so the detection of heavy metals by electrochemical methods has important app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/48G01N27/308
Inventor 兰翠玲谢瑞刚黄团徐敬尧杨途才周伶俐谢天生赵令民
Owner BAISE UNIV
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