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An electrode method for imprinting selectivity for real-time detection of trace lead in aqueous environments

A kind of technology of real-time detection, selectivity, is applied in the direction such as material electrochemical variable, can solve the problems such as there is no research report of lead ion selective electrode, reaches the effect that technique is simple, sensitivity is high, improves stability

Active Publication Date: 2016-01-20
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no research report on the preparation of lead ion-selective electrodes using lead ion-imprinted polymers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] (3) Preparation and application of lead ion selective electrode

[0036] Stick the lead ion PVC sensitive film on the PVC pipe with 5wt.%PVC tetrahydrofuran solution, use Ag / AgCl as the internal reference electrode, and use 0.01~0.5mol / LKCl and 0.001~0.1mol / L lead ion standard mixed solution as the internal Filled with liquid, the lead ion selective electrode is obtained.

[0037] Soak the prepared electrode in 0.001-0.1mol / L lead ion standard solution for activation, and the activation time can be from 1 hour to 3 days.

[0038] The electrochemical cell consists of:

[0039] Hg-Hg 2 Cl 2 |KCl(satd.)||solution to be tested||PVC film|KCl+PdCl 2 |AgCl-Ag

[0040] The ion selective electrode is used for the detection of lead ions in environmental water samples.

Embodiment 1

[0042] Mix 0.01mol 3-aminoethyltrimethoxysilane and 0.01mol glyoxylic acid in an ethanol solution, and react at a constant temperature of 50°C to form a silane containing a Schiff base functional group; then react with the silane containing a Schiff base functional group To form a chelate, use a hydrothermal method to heat at 120°C for 24 hours to make it fully react; mix ethyl orthosilicate with water in a certain proportion, adjust the pH=2 with hydrochloric acid, and form a uniform solution, mix with Pd( ) ion chelate silane solution mixed, after stirring for 20min, adding ammonia water to adjust the pH value in the range of 6-8, forming a gel, after aging for 48h, the product was filtered, washed with ethanol first, then stirred in 1mol / L hydrochloric acid solution After soaking for a certain period of time, the Pd( ) ions, filtered, with NaHCO 3 The solution was washed to pH=7, and then the solid was washed with distilled water to obtain Pd( ) ion imprinted material....

Embodiment 2

[0045] Mix 0.01mol 3-aminoethyltrimethoxysilane and 0.01mol glyoxylic acid in an ethanol solution, and react at a constant temperature of 50°C to form a silane containing a Schiff base functional group; then react with the silane containing a Schiff base functional group To form a chelate, use a hydrothermal method to heat at 120°C for 24 hours to make it fully react; mix ethyl orthosilicate with water in a certain proportion, adjust the pH=2 with hydrochloric acid, and form a uniform solution, mix with Pd( ) ion chelate silane solution mixed, after stirring for 20min, adding ammonia water to adjust the pH value in the range of 6-8, forming a gel, after aging for 48h, the product was filtered, washed with ethanol first, then stirred in 1mol / L hydrochloric acid solution After soaking for a certain period of time, the Pd( ) ions, filtered, with NaHCO 3 The solution was washed to pH=7, and then the solid was washed with distilled water to obtain Pd( ) ion imprinted material....

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Abstract

An electrode method for real-time detection of imprinting selectivity of trace lead in water environment, involving an environmental monitoring method for metal ions, the lead ion selective electrode is composed of a PVC pipe and an Ag / AgCl internal reference electrode inserted in it, Ag / AgCl The top of the electrode is connected with a wire, and the other end of the PVC pipe is glued with a sensitive film; the sensitive film is composed of lead ion imprinted silica gel material, plasticizer and PVC, and is fully dissolved and mixed with tetrahydrofuran at a mass ratio of 0.5-10:30-80:20-60 After stirring into a uniform viscous liquid, pour it on a glass plate, dry it at a dry room temperature to obtain the required sensitive film, and stick it on the end of the PVC pipe; use KCl and lead ion standard mixed solution as the inner filling liquid, That is, a lead ion selective electrode is obtained. The lead ion selective electrode of the invention has the advantages of simple preparation conditions, easy operation, good stability, high sensitivity, good reproducibility, strong ability to resist interference from other common ions in the environment, and the sensor is easy to carry. The invention can realize highly sensitive real-time on-line determination of lead ions in water environment samples.

Description

technical field [0001] The invention relates to an environmental monitoring method for metal ions, in particular to an electrode method for real-time detection of imprinting selectivity of trace lead in a water environment. Background technique [0002] Heavy metal pollution is the most serious environmental pollution and the most harmful pollution to human beings. There are many kinds of heavy metal ions, difficult to deal with, stable chemical properties, not easy to be degraded by microorganisms, enriched through the biological chain, and have a strong toxic effect on animals and plants. Therefore, the monitoring of heavy metal ions in the environment is of great significance. [0003] Lead is a highly toxic metal. Excess lead entering the human body will cause lifelong damage to the nervous system, blood system, and skeletal system. Especially for children, studies have shown that children are more than 30 times more likely to develop lead poisoning than adults. When ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/31G01N27/26
Inventor 姚慧范洪涛
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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