An Alloy Electrode Electrochemical Sensor for Detecting Trace Heavy Metals

A technology of trace heavy metals and alloy electrodes, applied in the direction of material electrochemical variables, etc., can solve the problems of easy oxidation in the detection process, complex manufacturing process of bismuth rod electrodes and bismuth film electrode sensors, limited applications, etc., to achieve good electrochemical performance , Easy to make, good reproducibility

Active Publication Date: 2011-11-30
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

However, bismuth rod electrodes and bismuth film electrode sensors based on metal bismuth are complicated to manufacture, easy to be oxidized in the detection process, and electrode stability and reproducibility need to be improved urgently, which limits their application in field detection and instrumentation. application

Method used

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  • An Alloy Electrode Electrochemical Sensor for Detecting Trace Heavy Metals
  • An Alloy Electrode Electrochemical Sensor for Detecting Trace Heavy Metals
  • An Alloy Electrode Electrochemical Sensor for Detecting Trace Heavy Metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Sensors using tin-bismuth alloy disc electrode as working electrode:

[0026] Such as figure 1 with 2 The sensor shown: the working electrode 1, the reference electrode 2 and the auxiliary electrode 3 are connected to the control potentiometer 4 by wires respectively; the working electrode 1, the reference electrode 2 and the auxiliary electrode 3 are inserted into the detection cell 5 containing the detection liquid, The detection cell 5 is provided with a magnetic stirrer 6 with a stirring effect, and the bottom of the detection cell is equipped with a magnetic stirrer to rotate the magnetic stirrer. The platinum electrode is used as the auxiliary electrode, the saturated calomel electrode is the reference electrode, and the potentiometer is controlled to measure the current response value.

[0027] The tin-bismuth alloy disc electrode has a structure of a tin-bismuth alloy wire 7 that is sealed with an inert insulating sealing material 9 on the outer surface, wherein the ...

Embodiment 2

[0029] The difference from Example 1 is that the working electrode is:

[0030] The tin-bismuth alloy column electrode is a structure of a tin-bismuth alloy wire 7 sealed with a PTFE sleeve 9 on the outer surface. One end of the tin-bismuth alloy wire 7 passes through one end of the PTFE sleeve 9, and the other end is inert to the insert. The lead 8 connection in the insulating sealing material (see image 3 ).

[0031] PTFE sleeve can be replaced by Ke1-F, AB rubber sleeve or glass sleeve. The reference electrode is a silver / silver chloride electrode, and the auxiliary electrode is a glassy carbon electrode.

Embodiment 3

[0033] The difference from Example 1 is that the working electrode is:

[0034] The working electrode 1 is a tin-bismuth alloy printed electrode. The manufacturing method is specifically to use a 6mm×5cm polyvinyl chloride material as the electrode substrate 10, clean and dry it, and then use a screen printer to print a 3mm×4cm conductive silver glue layer 11 and The electrode lead 14 is dried under an infrared lamp for 24 hours; then the 4mm×4cm tin-bismuth alloy working electrode layer 12 is printed with tin-bismuth alloy paste and dried; finally, the electrode insulating layer 13 is printed with a light-solid insulating paste, and Set aside 4mm×4mm as the effective working area of ​​the working electrode (see Figure 4 ), and finally cured with UV light.

[0035] The reference electrode is a printed silver / silver chloride electrode, and the auxiliary electrode is a printed silver electrode.

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PUM

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Abstract

The invention relates to the field of electrochemical sensors, and particularly relates to an alloy electrode electrochemical sensor for quickly detecting trace heavy metals. The electrochemical sensor specifically comprises an alloy working electrode, a reference electrode and an auxiliary electrode, wherein the working electrode, the reference electrode and the auxiliary electrode are respectively connected to a control potential rectifier by leads; and the working electrode is made of tin-bismuth alloy. The detection method is implemented by inserting the three electrodes into a sample to be detected, then detecting the concentration of heavy metal ions in the sample to be detected through stripping voltammetry. The electrochemical sensor provided by the invention is simple in process, low in cost, high in selectivity and sensitivity and good in stability, and can be widely applied to the quick field detection and daily monitoring of heavy metal ions in fresh water, sea water, food and body fluids.

Description

Technical field [0001] The invention relates to the field of electrochemical sensors, in particular to an alloy electrode electrochemical sensor for detecting trace heavy metals. Background technique [0002] With the rapid development of modern industry and transportation, heavy metal pollution in the environment has become increasingly serious, and it has become an important social issue affecting human health and public safety. Heavy metal elements can accumulate in the human body, which can cause anemia, neurological disorders, or kidney damage. As people's understanding of the hazards of heavy metals has become more and more profound, various countries have adopted various measures to reduce heavy metal pollution. Accurate, rapid and effective determination of heavy metal content has become an important content in the research of analytical methods in recent years. [0003] At present, the main methods for determining the content of heavy metals are atomic absorption spectrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 潘大为张丽庄建梅秦伟
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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