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A method for real-time monitoring of trace cadmium in water using a cadmium ion selective electrode

A kind of technology of real-time monitoring, cadmium ion, be applied in measuring device, carry out direction such as material analysis, instrument by electromagnetic means, can solve the problems such as not having cadmium ion selective electrode research report etc., reach technique is simple, high selectivity is measured, expand effective area effect

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 cadmium ion-selective electrodes using cadmium ion-imprinted polymers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] (3) Preparation and application of cadmium ion selective electrode

[0039] Glue the cadmium 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 cadmium ion standard mixed solution as the internal reference electrode. Filling with liquid, the cadmium ion selective electrode is obtained.

[0040] Soak the prepared electrode in 0.00001-0.1mol / L cadmium ion standard solution for activation, and the activation time can be from 1 hour to 3 days.

[0041] The electrochemical cell consists of:

[0042] Hg-Hg 2 Cl 2 |KCl(satd.)||solution to be tested||PVC film|KCl+CdCl 2 |AgCl-Ag

[0043] The above ion selective electrode is used for the detection of cadmium ions in environmental water samples.

Embodiment 1

[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 to 2 with hydrochloric acid, and form a uniform solution, mix with Cd( ) 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 Cd was removed after soaking for a certain period of time ( ) ions, filtered, with NaHCO 3 The solution was washed to pH=7, and then the solid was washed with distilled water to obtain Cd( ) ion imprinte...

Embodiment 2

[0048] 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 to 2 with hydrochloric acid, and form a uniform solution, mix with Cd( ) 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 Cd was removed after soaking for a certain period of time ( ) ions, filtered, with NaHCO 3 The solution was washed to pH=7, and then the solid was washed with distilled water to obtain Cd( ) ion imprinte...

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Abstract

A method for real-time detection of trace cadmium imprinted selective electrodes in water, involving an environmental monitoring method for metal ions. The cadmium ion selective electrode is composed of a PVC pipe and an Ag / AgCl internal reference electrode inserted in it. The top of the Ag / AgCl electrode is The other end of the PVC pipe is connected with a sensitive film; the sensitive film is composed of cadmium ion imprinted silica gel material, plasticizer and PVC according to the mass ratio of 0.5-10:30-80:20-60, fully dissolved in tetrahydrofuran, mixed and stirred to form After the uniform viscous liquid is poured on a glass plate, it is dried at a dry room temperature to obtain the required sensitive film, which is glued to the end of the PVC pipe; the standard mixed solution of KCl and cadmium ions is used as the inner filling liquid to obtain the cadmium ion selective electrode. The cadmium 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 high-sensitivity real-time on-line determination of cadmium ions in water environment samples.

Description

technical field [0001] The invention relates to an environmental monitoring method for metal ions, in particular to a method for real-time detection of trace cadmium imprinted selective electrodes in water. 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] Cadmium is one of the most toxic heavy metal elements to humans and animals. Long-term exposure to low levels of Cd(II) can cause gastrointestinal diseases such as vomiting and diarrhea. Acute cadmium poisoning can cause kidney disease and even death. Cadmium can also affect the metabolism of calcium in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333
Inventor 姚慧王帅范洪涛
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY