Method for electrochemical detection of lead ions of ordered silicon nano-pore film/indium tin oxide electrode

A technology of indium tin oxide and silicon nanometers, applied in the direction of material electrochemical variables, etc., can solve the problems of cumbersome electrode pre-oxidation process and obstacles to popularization and application, and achieve high thermal and chemical stability, high sensitivity, and high porosity Effect

Active Publication Date: 2017-01-04
杨婷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the need for professional instruments for electrochemical detection of blood lead, but in the process of measuring blood lead by this method, the pre-oxidation process of the electrode is relatively cumbersome and the sensor can only be used once, which has caused great obstacles to popularization and application.

Method used

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  • Method for electrochemical detection of lead ions of ordered silicon nano-pore film/indium tin oxide electrode
  • Method for electrochemical detection of lead ions of ordered silicon nano-pore film/indium tin oxide electrode
  • Method for electrochemical detection of lead ions of ordered silicon nano-pore film/indium tin oxide electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preparation of VOMs / ITO electrodes

[0051] (1) Precursor solution preparation: Weigh 0.16g CTAB, add 70ml deionized water and stir thoroughly, then add 30ml ethanol, 12μL ammonia water (20-25%), 80μL TEOS, and stir for 10min.

[0052] (2) CSMs / VOMs / ITO electrode preparation: Pour the precursor solution into the reactor and put the cleaned ITO electrode. The reactor was sealed and heated in a 60°C water bath for 24h. After the reaction was completed, the sample was washed with a large amount of deionized water, dried with nitrogen, and aged in an oven at 100°C for 12h.

[0053] (3) VOMs / ITO electrode preparation: put the CSMs / VOMs / ITO electrode in 0.1mol / L hydrochloric acid / ethanol solution, stir for 10min to remove the CTAB micelles in the electrode, and obtain the VOMs / ITO electrode.

[0054] 2. Characterization

[0055] The VOMs / ITO electrode in Example 1 is characterized by electrochemical probes, Zeta potential, scanning electron microscopy, transmission elect...

Embodiment 2

[0073] The artificial lake water was diluted with pH 5.6 acetic acid-sodium acetate buffer at a ratio of 1:1, and 1nmol / L, 10nmol / L and 500nmol / L lead ion solutions were added using the standard addition method.

[0074] The VOMs / ITO electrode prepared in step 1 in Example 1 is used as the working electrode, the platinum electrode is the reference electrode, and Ag / AgCl is the reference electrode, and the above solutions are respectively added thereto, and the constant voltage is rich at -0.75V. Set of 420s. Then the electrode that has been enriched is washed with deionized water, and then the peak current intensity of different concentrations of lead ions is measured by differential pulse voltammetry (DPV), wherein the working parameters of differential pulse voltammetry: the initial potential is -0.75V , the termination potential is -0.2V.

[0075] Calculate lead ion concentration according to the working curve established in step 3 in Example 1, and then calculate the reco...

Embodiment 3

[0077] The separated human serum was diluted with pH 5.6 acetic acid-sodium acetate buffer at a ratio of 1:40, and 1 nmol / L, 10 nmol / L and 500 nmol / L lead ion solutions were added by standard addition method.

[0078] The VOMs / ITO electrode prepared in step 1 in Example 1 is used as the working electrode, the platinum electrode is the reference electrode, and Ag / AgCl is the reference electrode, and the above solutions are respectively added thereto, and the constant voltage is rich at -0.75V. Set of 420s. Then the electrode that has been enriched is washed with deionized water, and then the peak current intensity of different concentrations of lead ions is measured by differential pulse voltammetry (DPV), wherein the working parameters of differential pulse voltammetry: the initial potential is -0.75V , the termination potential is -0.2V.

[0079] Calculate lead ion concentration according to the working curve established in step 3 in Example 1, and then calculate the recover...

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Abstract

The invention discloses a method for electrochemical detection of lead ions of an ordered silicon nano-pore film/indium tin oxide electrode. The method comprises the following steps: (1) mixing the sample to be tested with the buffer solution to obtain liquid to be tested with pH of 3.6 to 6; (2) using the ordered silicon nano-pore film/indium tin oxide electrode as the working electrode, gathering the lead ions in the liquid to be tested by the constant voltage method with the gathering voltage of 0.8-0. 6V; (3) placing the gathered electrode in the buffer solution of pH value at 3.6-6.0, measuring the peak current by means of the differential pulse voltammetry method, and according to the standard curve, calculating the concentration of the lead ions in the sample to be tested, wherein the starting potential of the differential pulse voltammetry is 0.95-0.65V and the termination potential is 0.4-0.5V. The method of the invention can realize the detection of trace lead ions, and has potential application value in the detection of the actual sample, especially the detection of the biological complex sample.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a method for electrochemically detecting lead ions with an ordered silicon nanopore film / indium tin oxide electrode. Background technique [0002] Lead has the characteristics of low melting point, corrosion resistance, high density and easy processing, so it is widely used in various fields. The world's annual lead consumption is about 4 million tons, but only 1 / 4 of the lead is recycled, and the rest will enter the environment in different forms such as wastewater and waste residues, thereby polluting soil and water. [0003] In daily life, the human body may ingest trace amounts of lead through diet, such as eating preserved eggs containing lead and drinking water with excessive lead content. Ingested lead can accumulate in the human body after being absorbed by the human body. Lead mainly exists in the bones, and a small amount is enriched in the liver, brain, kidney and blood....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 刘吉洋程博文周璘袁坤奚凤娜
Owner 杨婷
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