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Optically-controlled polymer sensitive membrane electrochemical detection method and device thereof

A detection method and a technology of polymer membranes, which are applied in the direction of measuring devices, electrochemical variables of materials, scientific instruments, etc., can solve the problems that the ions to be measured cannot be directly detected and applied, and achieve convenient operation, improved sensitivity, and strong versatility Effect

Active Publication Date: 2019-01-11
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technique is currently not available for direct detection applications of the analyte ions

Method used

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  • Optically-controlled polymer sensitive membrane electrochemical detection method and device thereof
  • Optically-controlled polymer sensitive membrane electrochemical detection method and device thereof
  • Optically-controlled polymer sensitive membrane electrochemical detection method and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] device such as figure 1 The shown includes a detection cell, an external electrochemical measuring device, and a light source; the detection cell is placed on the light source, and a working electrode, a reference electrode and an auxiliary electrode are inserted in the detection cell, and each electrode is connected to the external electrochemical measuring device through wires. connect.

[0039] The working electrode is a polymer membrane ion-selective electrode (1), with a polymer sensitive membrane (2) at the bottom; the external reference electrode (3) is silver silver chloride or saturated calomel electrode, platinum wire / piece The electrode is a counter electrode (4). The detection pool (6) holds the object to be detected; the light source is connected with an electronic relay (8) that controls its switch and illumination time through wires.

[0040] The external potential measuring device is an electrochemical workstation or an ion meter.

Embodiment 2

[0042] Use the above-mentioned device to detect the potential response in different concentrations of copper ions, specifically:

[0043] Preparation of polymer membrane ion selective electrode:

[0044] 1) The preparation of the electrode is

[0045] ① Obtaining the conductive layer: Electropolymerize EDOT (0.01M) and PSS (0.1M) (the molar ratio of the two substances is 8-10:1) into a PEDOT (PSS) compound under constant current conditions, and then The composite is deposited on the surface of the glassy carbon electrode to form a conductive layer. The electrodeposition method is as follows: constant current method is adopted, the current is set at 0.014mA, and the deposition time is 714 s; the thickness of the conductive layer can be controlled by adjusting the current and deposition time.

[0046] 2) Preparation of neutral electrolyte: sodium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate and bis(4-tert-butylphenyl)iodotrifluoromethanesulfonate in a molar ratio of 1:2 Mix...

Embodiment 3

[0053] Difference with embodiment 1 is:

[0054] A 375 nm LED (10.8 mm*10.8mm, 5.0 lm / W) array was used for light control experiments. The light time is controlled by a relay, and the light time is 30 s.

[0055] During the measurement, the open circuit potential measurement technology was used to measure the real-time potential response of the electrode when it was illuminated in different concentrations of copper ions. The results were as follows: image 3 shown. The activity of the copper ion to be measured can be determined according to the electrode potential response.

[0056] Depend on image 3 It can be seen that when light is applied, the ion exchanger in the sensitive membrane phase and the neutral electrolyte substance compounded by the photosensitive dye are photodegraded, hydrogen ions are produced, and the electrode potential decreases. When the light is over, copper ions are extracted into the sensitive membrane phase, and the electrode potential response of...

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Abstract

The invention relates to a polymer sensitive membrane ion selective electrode, specifically an optically-controlled polymer sensitive membrane electrochemical detection method and device thereof. Thedetection method comprises the following steps: enabling a to-be-detected substance to enter the membrane to produce change according to degrading and releasing ion exchanger in photosensitive dyes inan electric neutrality electrolyte material in the bottom polymer sensitive membrane of the polymer ion membrane ion selective electrode before and after illumination, thereby realizing the measuringof the to-be-detected ion, wherein the electric neutrality electrolyte material in the polymer sensitive membrane is photo-induced exchanger or a mixture composed of the ion exchanger or the photosensitive dyes, and the ion exchanger and the photosensitive dye are mixed according to substance mass ratio of 1: 1 to 1: 5. A light-controlled ion enters a sensitive membrane phase and produces potential response on the electrode surface; the direct detection on the constant potential coulomb analysis can be realized, the operation is simple and convenient, and the method is high in sensitivity.

Description

technical field [0001] The invention relates to a polymer sensitive membrane ion-selective electrode, in particular to a light-controlled sensitive membrane electrochemical detection method and a device thereof. Background technique [0002] The polymer-sensitive membrane ion-selective electrode is easy to operate, easy to carry, and can perform continuous and rapid detection of analytes. It has been widely used in environmental, clinical, food safety and other fields. The existing potential detection usually measures the steady-state electrochemical response of the polymer sensitive membrane, and mostly uses the open circuit potential analysis technique, so the sensitivity of the electrode is not high and frequent calibration is required. The constant potential coulometric analysis technique is a new type of sensitive membrane potential analysis technique, but this technique can only be used to measure the change process of the ion concentration of the sample solution, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/333G01N27/416G01N27/42
CPCG01N27/305G01N27/3335G01N27/4166G01N27/4168G01N27/423
Inventor 丁家旺秦伟
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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