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Electrochemical sensor for field trace heavy metal detection

A trace heavy metal, electrochemical technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of unstable detection signal, poor reproducibility, limited application, etc., to achieve rapid detection, easy operation, reproducibility Good results

Inactive Publication Date: 2011-02-16
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, the pre-coated bismuth film is unstable when exposed to the air and is easily oxidized, resulting in unstable detection signals and poor reproducibility
Co-plating bismuth film method can only be used in acidic medium because bismuth ions are easily hydrolyzed, which limits its application in on-site detection

Method used

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  • Electrochemical sensor for field trace heavy metal detection
  • Electrochemical sensor for field trace heavy metal detection
  • Electrochemical sensor for field trace heavy metal detection

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The sensor includes a working electrode, a reference electrode, an auxiliary electrode, an electroplating solution and a detection solution. The working electrode 1, the auxiliary electrode 2 and the reference electrode 3 are respectively connected to the control potentiometer 4 through wires; the three electrodes are inserted into the detection solution 6 for use . The schematic diagram of the sensor is as figure 1 shown.

[0022] The working electrode 1 needs to be coated with the electroplating solution 5 before detection; the electroplating solution is a mixed solution containing bismuth nitrate, wherein the concentration of bismuth in the mixed solution is 0.05-1.5 mg / L, and the pH value is 2-5.

[0023] The working electrode can be carbon, gold, platinum, aluminum, copper, iron, indium, tungsten or conductive ITO electrode; the reference electrode can be saturated calomel electrode, silver / silver chloride electrode or double junction electrode; the auxiliary elec...

Embodiment 2

[0025] The working electrode is a platinum electrode, and the detection solution is a mixture of bismuth nitrate and perchloric acid, wherein the concentration of bismuth is 1.2mg / L, and the pH value of the solution is 2; the electroplating solution is a mixture of bismuth nitrate and citrate buffer solution, wherein The bismuth concentration is 0.8mg / L, and the pH value of the solution is 4. The citrate buffer solution is a mixed solution of citric acid and sodium dihydrogen phosphate.

[0026] After polishing the platinum electrode, sweep cyclic voltammetry in 0.5M sulfuric acid solution until the electrode reaches a stable state, and then wash it with high-purity water. Put the platinum electrode into the electroplating solution, and pre-plate the bismuth film for 2 minutes. Add a standard lead ion solution with a concentration of 1 μmol / L to the detection solution, and co-deposit bismuth and lead at a constant potential of -0.9V for 3 minutes. Apply a positive scanning p...

Embodiment 3

[0028] The working electrode is a gold electrode, and the detection solution is a mixture of bismuth nitrate and hydrochloric acid, wherein the concentration of bismuth is 0.8mg / L, and the pH value of the solution is 1.5; the electroplating solution is a mixture of bismuth nitrate and phosphate buffer solution, wherein the concentration of bismuth is 1.5mg / L, the pH value of the solution is 3. The phosphate buffer solution is a mixed solution of phosphoric acid and disodium hydrogen phosphate.

[0029] After polishing the gold electrode, sweep cyclic voltammetry in 0.5M sulfuric acid solution until the electrode reaches a stable state, and then wash it with high-purity water. Put the gold electrode into the electroplating solution, and pre-plate the bismuth film for 1.5min. Add a standard lead ion solution to the detection solution, and co-deposit bismuth and lead at a constant potential of -1.0V for 3 minutes. Apply a positive scanning potential between -0.9 and -0.3V for o...

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Abstract

The invention relates to the field of electrochemical sensors, in particular to an electrochemical sensor for field trace heavy metal detection. In the electrochemical sensor, a working electrode, a reference electrode and an auxiliary electrode are connected to a control potentiometer through leads; the working electrode is plated with a film by using electroplate liquid before the detection of a practical sample; and before detection, the practical sample needs mixing with detection liquid. A detection method comprises the following steps of: adding a sample to be detected into the detection liquid on site, mixing uniformly and standing for later use; and putting the cleaned and ground working electrode into the electroplate liquid together with the reference electrode and the auxiliary electrode for pre-plating a bismuth film, inserting the three electrodes into the detection liquid and detecting the concentration of heavy metals in the sample to be detected by an electrochemical co-plating method. The sensor has low cost, high sensitivity and high repeatability, is easy and convenient to operate and can be widely applied to rapid on-site detection and daily monitoring of heavy metal ions in fresh water, sea water, articles for daily use and body fluid.

Description

technical field [0001] The invention relates to the field of electrochemical sensors, in particular to an electrochemical sensor for on-site detection of trace heavy metals. Background technique [0002] With the development of my country's economy and society, the process of industrialization is accelerating, and the problem of heavy metal pollution has become increasingly prominent, which has become one of the environmental hotspots that the whole society pays close attention to. Heavy metal elements can accumulate in the human body, which can cause anemia, neurological dysfunction or kidney damage and other hazards. In recent years, heavy metal pollution in my country has been on the rise. The recent heavy metal pollution incidents have put forward higher requirements for heavy metal monitoring, and also put forward a more urgent demand for rapid online monitoring and early warning of heavy metal pollution incidents. Accurate, rapid and effective on-site determination o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/413G01N27/42
Inventor 潘大为秦伟张丽逯文晶
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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