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Method for detecting lead ions by utilizing electrochemical sensor

An electrochemical, lead ion technology, applied in the direction of electrochemical variables of materials, can solve the problems of low detection limit of accuracy, and achieve the effect of good acid and alkali resistance, high specific surface area, improved linear range and sensing speed

Inactive Publication Date: 2016-10-12
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method has been shown to have high accuracy and low detection limits for the detection of heavy metal lead ions

Method used

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  • Method for detecting lead ions by utilizing electrochemical sensor
  • Method for detecting lead ions by utilizing electrochemical sensor
  • Method for detecting lead ions by utilizing electrochemical sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A kind of method utilizing electrochemical sensor to detect lead ion of the present invention, the electrochemical sensor involved in the method is made up of working electrode, counter electrode, reference electrode, electrolytic cell and electrochemical workstation, and working electrode 2 is made up of Glassy carbon electrode substrate 6, Nafion film 7 and ordered tubular mesoporous carbon / aminopyrene composite 8, one end of working electrode 2, counter electrode 3 and reference electrode 4 are respectively connected to electrochemical workstation 1, working electrode 2 , the other end of the counter electrode 3 and the reference electrode 4 are respectively placed in the electrolytic solution in the electrolytic cell 5, the electrolytic solution in the electrolytic cell 5 is the acetic acid-sodium acetate buffer solution containing the lead ion to be measured, and the reference electrode 4 is Silver or silver chloride electrode, the counter electrode 3 is a platinum ...

Embodiment 2

[0034] The electrochemical sensor involved is identical with embodiment 1;

[0035] The specific operation is carried out according to the following steps:

[0036] Preparation of tubular ordered mesoporous carbon / aminopyrene composites:

[0037] a. Inject the mixed solution of furfuryl alcohol, trimethylbenzene and oxalic acid into the pores of ordered mesoporous silica SBA-15, heat at 50°C and 90°C for 24 hours respectively, and put the obtained yellow powder into a porcelain boat , put the porcelain boat into a tube furnace, anneal at a temperature of 850°C for 4 hours to obtain a black powder, soak it in a hydrofluoric acid solution, stir for 24 hours, filter the black powder, wash it with deionized water, and put it in the oven Dry at 60°C to obtain tubular ordered mesoporous carbon, and then ultrasonically compound aminopyrene and tubular ordered mesoporous carbon to obtain tubular ordered mesoporous carbon / aminopyrene composite 8 with good dispersion;

[0038] Prepara...

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Abstract

The invention relates to a method for detecting lead ions by utilizing an electrochemical sensor. The electrochemical sensor related in the method consists of a working electrode, a counter electrode, a reference electrode, an electrolytic cell and an electrochemical workstation, wherein the working electrode consists of a glassy carbon electrode substrate, a Nafion membrane and an orderly tubular mesoporous carbon / amino pyrene compound, the working electrode uses the glassy carbon electrode as a substrate electrode, and the surface of the substrate electrode is modified with a Nafion / orderly tubular mesoporous carbon / amino pyrene compound membrane. The electrochemical sensor in the method integrates the characteristics of the large specific surface of tubular mesoporous carbon and effective heavy metal ion adsorption of Nafion and amino pyrene and can detect the lead ions within a great range, and the upper detection limit reaches 500 micrograms per liter. The method has good reproducibility, strong anti-interference capability and high stability and can be used for lead ion field analysis.

Description

technical field [0001] The invention relates to the field of electrochemical sensors for heavy metal ions, in particular to a method for detecting lead ions by using an electrochemical sensor. Background technique [0002] In recent years, with the rapid development of industry, agriculture and economy, heavy metals (ρ>5g / cm 3 ) pollution, heavy metal pollution has become one of the most harmful environmental pollution problems. Heavy metal pollutants are difficult to degrade in the environment, and can stay and accumulate in animals and plants for a long time. They are gradually enriched through the food chain, and their concentration increases tens of thousands of times after entering the human body, which greatly damages the health of residents. Taking lead pollutants as an example, Xinjiang is rich in coal and mineral resources, and lead pollution is unavoidable in the process of mining and use. Relevant investigations and studies have shown that: Urumqi, Shihezi an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 周生海王传义李守柱
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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