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Preparation method of cadmium ion electrochemical sensor

An electrochemical and cadmium ion technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of unsuitable on-site detection, narrow linear range, difficult to popularize, etc., and achieve good electrochemical performance response and high sensitivity.

Inactive Publication Date: 2019-09-13
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have the disadvantages of expensive equipment, complex operation and sample processing, narrow linear range, long detection time, unsuitable for on-site detection, and difficult to popularize.

Method used

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  • Preparation method of cadmium ion electrochemical sensor
  • Preparation method of cadmium ion electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of sodium carboxymethyl cellulose electrode

[0016] The bare glassy carbon electrode was polished with 1.0, 0.3, and 0.05 μm Al2O3 powder, and then ultrasonically cleaned in ultrapure water, ethanol, and ultrapure water for 3 min, and dried naturally. Dissolve 5 mg sodium carboxymethylcellulose in ultrapure water to prepare a 0.5 mg / mL solution, then use a pipette gun to draw 5 μL of the solution and drop it on the surface of the bare glassy carbon electrode, and obtain carboxymethyl cellulose after natural drying at room temperature Sodium cellulose modified electrode;

Embodiment 2

[0018] Electrochemical performance detection of different modified electrodes

[0019] Glassy carbon electrode, sodium carboxymethyl cellulose modified electrode, bismuth film modified electrode, bismuth film and sodium carboxymethyl cellulose modified electrode were used as working electrodes, platinum wire electrode was used as auxiliary electrode, silver / silver chloride electrode was used as As a reference electrode, a three-electrode system was established, and its electrochemical performance was studied by cyclic voltammetry on the CHI-660E electrochemical workstation, as shown in figure 1 As shown, it was found that the bismuth film and sodium carboxymethyl cellulose modified electrode had a larger peak current than the glassy carbon electrode and sodium carboxymethyl cellulose modified electrode, indicating that the bismuth film and sodium carboxymethyl cellulose were successfully attached to the electrode surface. And can be used for cadmium ion detection.

Embodiment 3

[0021] Detection of cadmium ion with different modified electrodes

[0022] Glassy carbon electrode, sodium carboxymethyl cellulose modified electrode, bismuth film modified electrode, bismuth film and sodium carboxymethyl cellulose modified electrode were used as working electrodes, platinum wire electrode was used as auxiliary electrode, silver / silver chloride electrode was used as As a reference electrode, a three-electrode system was established. On the CHI-660E electrochemical workstation, the differential pulse anodic stripping method was used to detect the concentration of cadmium ions. figure 2 As shown, it was found that the bismuth film and sodium carboxymethyl cellulose modified electrodes were more responsive and sensitive to cadmium ions than the other three electrodes. It shows that the modified electrode has the function of detecting cadmium ions.

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Abstract

The invention aims at providing an electrochemical sensor for detecting heavy metal cadmium ion, and a preparation method. A structure of the sensor is composed of an electrochemical workstation, an electrolytic cell and electrodes. The electrodes comprise a silver / silver chloride reference electrode, a platinum wire counter electrode and a work electrode, wherein the work electrode is glassy carbon electrode modified by adopting bismuth film and sodium carboxymethylcellulose. The electrochemical sensor can realize the sensitive detection of the trace heavy metal cadmium ion and can be used for detecting the heavy metal cadmium ion of an actual water sample. The preparation method disclosed by the invention is low in cost, simple in preparation, high in sensitivity, simple and convenient to apply and operate, and expected to be used for commercial development.

Description

technical field [0001] The invention relates to the field of electrochemical sensors for trace heavy metal ions, in particular to a method for preparing a highly sensitive electrochemical sensor for trace analysis of cadmium ions, in particular to a sensor modified by sodium carboxymethyl cellulose / bismuth film Electrode preparation. Background technique [0002] With the development of industry and society, human activities have intensified the enrichment and diffusion of cadmium ions. Excessive heavy metals will accumulate in living organisms, gradually accumulate and amplify through the food chain, and may eventually enter the human body, directly endangering health. The World Health Organization and my country's "Drinking Water Sanitation Standards" respectively stipulate the cadmium content, which is 0.003 and 0.005 mg / L respectively. When the cadmium content entering the human body exceeds the maximum allowable value, it will destroy the normal physiological functions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/333G01N27/48C25D5/18
CPCC25D5/18G01N27/308G01N27/3335G01N27/48
Inventor 宁静恒刘永乐王发祥罗新
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY