Method for rapidly detecting trace heavy metal ions

A trace heavy metal, rapid technology, applied in the direction of material electrochemical variables, etc., can solve the problems of low detection limit and low detection sensitivity

Inactive Publication Date: 2013-06-05
XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Solve the disadvantages of low detection sensitivity and low detection limit when using stripping voltam

Method used

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  • Method for rapidly detecting trace heavy metal ions

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Experimental program
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Effect test

Embodiment 1

[0026] Preparation of bismuth three-dimensional flower-like array in bismuth nanowire array 3:

[0027] Using BiCl with a purity of 99.999% 3 and deionized water to prepare the electrolyte for the electrodeposition bismuth three-dimensional flower-like nanostructure electrode array, and the composition of the final dissolved electrolyte is: BiCl 3 Concentration 15 mmol / L, NaCl concentration 0.3mol / L, H 3 BO 3 The concentration is 0.25mol / L, the concentration of HCl is 0.45mol / L, copper foil is used as the working electrode for deposition, and the three-dimensional flower-like nanostructure electrode array is deposited in the electrolytic cell of the three-electrode system. The deposition process is controlled by the electrochemical workstation AUTOLAB, and the instrument The model is PGS-TAT30, the potential of electrodeposition is -1.3V (relatively saturated calomel electrode), the deposition time is 8 minutes, and the temperature of the electrolyte is kept at room temp...

Embodiment 2

[0034] Preparation of bismuth three-dimensional flower-like array in bismuth nanowire array 3:

[0035] Using BiCl with a purity of 99.999% 3 and deionized water to prepare the electrolyte for the electrodeposition bismuth three-dimensional flower-like nanostructure electrode array, and the composition of the final dissolved electrolyte is: BiCl 3 Concentration 10mmol / L, NaCl concentration 0.3mol / L, H 3 BO 3 The concentration is 0.25mol / L, the concentration of HCl is 0.45mol / L, copper foil is used as the working electrode for deposition, and the three-dimensional flower-like nanostructure electrode array is deposited in the electrolytic cell of the three-electrode system. The deposition process is controlled by the electrochemical workstation AUTOLAB, and the instrument The model is PGS-TAT30, the potential of electrodeposition is -1.2V (relatively saturated calomel electrode), the deposition time is 15 minutes, and the temperature of the electrolyte is kept at room temp...

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Abstract

The invention relates to a method for rapidly detecting trace heavy metal ions. A related device in the method is composed of an electrolytic cell, working electrode signal channels, bismuth electrode arrays, a composite structure working electrode, a reference electrode and a counter electrode. An electrochemical stripping voltmeter-ammeter method is adopted to carry out detection. Through three bismuth electrode arrays with different structures, namely, a three-dimensional flower-shaped array, a nanowire array and a nanometer needle tip array, planar integration and three-dimensional integration are respectively achieved by the method, and an electrochemical transducer of the composite structure working electrode is constructed. The electrochemical transducer of the composite structure working electrode has the advantages of being low in manufacturing cost, high in performance, capable of achieving large-area preparation and the like. Through the electrochemical transducer, trace heavy metal in water can be detected rapidly, and the electrochemical transducer is low in cost, environment-friendly, and capable of being portable for carrying out detection. The defects that due to the fact that when the stripping voltmeter-ammeter method in the prior art is used for detecting the trace heavy metal ions, only working electrodes of one structure is used so that detection sensitivity is not high and limit of detection is not high are overcome.

Description

technical field [0001] The invention belongs to the technical field of electrochemical sensors, in particular to a method for rapidly detecting trace heavy metal ions. Background technique [0002] The premise of heavy metal pollution prevention and control is to be able to quickly and accurately detect heavy metals in pollutants. Among many detection methods, electrochemical stripping voltammetry has the advantages of convenience and economy, and is one of the preferred methods for rapid detection of heavy metal ions in water. [0003] Heavy metals are highly toxic, difficult to be metabolized in the environment, easy to be enriched by organisms and have a biomagnification effect, which is a pollutant that seriously endangers the ecological environment. The premise of heavy metal pollution prevention and control is to be able to detect it quickly and accurately. Electrochemical stripping voltammetry is currently the fastest, most sensitive and most convenient detection me...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 刘向阳卞卫国田长彦
Owner XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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