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Acupuncture needle-based working electrode electrochemical sensor for detecting trace heavy metals

A technology of trace heavy metals and working electrodes, applied in the direction of material electrochemical variables, etc., can solve the problems of low detection sensitivity and inability to meet heavy metal detection, and achieve the effect of high sensitivity, low price and simple production

Active Publication Date: 2018-01-12
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of its unique advantages, the present invention prepares it as the core component of the electrochemical sensor - the working electrode, and overcomes the defect that the stainless steel acupuncture needle electrode has low detection sensitivity of the object to be tested and cannot meet the needs of heavy metal detection in actual samples

Method used

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  • Acupuncture needle-based working electrode electrochemical sensor for detecting trace heavy metals
  • Acupuncture needle-based working electrode electrochemical sensor for detecting trace heavy metals
  • Acupuncture needle-based working electrode electrochemical sensor for detecting trace heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using gold as metal nanoparticles to construct acupuncture needle-based electrochemical sensors:

[0034] Such as figure 1 and 2 The sensor shown: the working electrode 1, the reference electrode 2 and the auxiliary electrode 3 are inserted into the electrolytic cell 4 filled with the detection solution, the electrolytic cell 4 has a magnetic stirrer 5, and the electrolytic cell is equipped with a magnetic stirrer; the working electrode 1, The reference electrode 2 and the auxiliary electrode 3 are respectively connected to the electrochemical workstation 6 by wires.

[0035] The auxiliary electrode is a platinum sheet electrode, the reference electrode is an Ag / AgCl electrode, and the electrochemical workstation measures the current response value.

[0036] The gold is used as the acupuncture needle-based working electrode of metal nanoparticles, the needle handle 7 is used as a wire, the surface of the needle rod 9 is insulated by a polyvinyl chloride tube 10, and t...

Embodiment 2

[0042] Using platinum as metal nanoparticles to construct acupuncture needle-based electrochemical sensors:

[0043]The difference from Example 1 is that the metal nanoparticles 11 on the surface of the needle tip 13 are platinum nanoparticles.

[0044] Acupuncture needle electrode with needle tip 13 after washing treatment is used as working electrode, Ag / AgCl electrode is used as reference electrode 2, platinum sheet is used as auxiliary electrode 3, 2mM chloroplatinic acid solution (0.5M H 2 SO 4 Diluted) as the electrolyte solution, using constant potential technology, deposited at -0.25V for 100s under stirring conditions, and obtained acupuncture needle electrodes with needle tips 13 covered with platinum nanoparticles 11.

[0045] The needle tip of the acupuncture needle electrode covered with platinum nanoparticles was immersed in the cation exchange membrane (Nafion) solution for 3 seconds, and then dried in the air to obtain the acupuncture needle-based working elec...

Embodiment 3

[0047] Using palladium as metal nanoparticles to construct acupuncture needle-based electrochemical sensors:

[0048] The difference from Example 1 is that the metal nanoparticles 11 on the surface of the needle tip 13 are palladium nanoparticles.

[0049] Acupuncture needle electrode with needle tip 13 after washing as working electrode, Ag / AgCl as reference electrode 2, platinum sheet as auxiliary electrode 3, 1mM sodium chloropalladate solution (0.5M H 2 SO 4 Diluted) as the electrolyte solution, using constant potential technology, deposited at -0.3V for 90s under stirring conditions, and obtained acupuncture needle electrodes 13 covered with palladium nanoparticles 11 .

[0050] Immerse the tip of the acupuncture needle electrode covered with palladium nanoparticles in the cation exchange membrane (Nafion) solution for 3 seconds, take it out and dry it to obtain the acupuncture needle-based working electrode modified with palladium nanoparticles 11 and cation exchange me...

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Abstract

The invention relates to the field of electrochemical sensors, in particular to an acupuncture needle-based working electrode electrochemical sensor for detecting trace heavy metals. The acupuncture needle-based working electrode electrochemical sensor comprises an acupuncture needle-based working electrode, a reference electrode and an auxiliary electrode. The working electrode consists of a stainless steel acupuncture needle. A polyvinyl chloride tube is used to insulate the needle bar part of the acupuncture needle. The joint part of the polyvinyl chloride tube and the needle bar is sealedwith silicone rubber, the needle tip of the acupuncture needle is used as a sensing surface, the needle tip surface is covered with metal nanoparticles and cation exchange membranes on the surfaces ofthe metal nanoparticles. The detection method is that inserting the acupuncture needle-based working electrode into a sample to be tested along with the reference electrode and the auxiliary electrode, and detecting the concentration of heavy metal ions in the sample to be tested by anodic stripping voltammetry. The acupuncture needle-based working electrode electrochemical sensor prepared by themethod has the advantages of simple process, low cost, high sensitivity, good selectivity and stability and can be widely used for detecting trace heavy metals.

Description

technical field [0001] The invention relates to the field of electrochemical sensors, in particular to an acupuncture needle-based working electrode electrochemical sensor for detecting trace heavy metals. Background technique [0002] With the rapid development of modern industry and agriculture and the improvement of people's living standards, the problem of heavy metal pollution in the environment has become increasingly serious, which has seriously affected human health and safety. Heavy metals in the environment come from a wide range of sources, such as metal electroplating, mining operations, leather industry, fertilizer industry, paper industry, pesticide production and other processes will produce a large amount of heavy metals. Heavy metals are discharged into the environment, which can cause changes in the structure and function of the ecosystem through the transfer and accumulation on the food chain. Heavy metals are highly toxic, difficult to decompose, easy to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
Inventor 潘大为韩海涛
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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