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Method and device for carrying out potential change detection through using photoelectrochemical method

A photoelectrochemical and change detection technology, applied in the field of electrochemical analysis, can solve problems such as complex processes, achieve the effects of simple preparation, reduced background signal, and strong versatility

Active Publication Date: 2019-11-19
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, those skilled in the art know that if only a certain ion is detected by photoelectrochemistry, a specific reaction between the electrode surface material and the ion to be measured is required, but the process is complicated.

Method used

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  • Method and device for carrying out potential change detection through using photoelectrochemical method
  • Method and device for carrying out potential change detection through using photoelectrochemical method
  • Method and device for carrying out potential change detection through using photoelectrochemical method

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Embodiment 1

[0040] 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.

[0041] Described working electrode is the electrode (1) that photosensitive material is modified, and its electrode surface is provided with photosensitive material (2); Reference electrode (3) is silver-silver chloride or ion selective electrode, (when ion selective electrode is used as reference When comparing the electrode, the surface of the electrode is provided with a polymer sensitive film (4); the platinum wire / sheet electrode is the object to be detected in the detection pool of the counter electrode (5); the light source (6) controls its switch through the wire Link to eac...

Embodiment 2

[0044] Preparation of photosensitive material modified electrode:

[0045] 1) Obtaining of photosensitive materials: ZnSe / r-GO composites were synthesized by hydrothermal method. Specifically:

[0046] 30 mg GO was dissolved in 18 mL deionized water by sonication; then 0.05 mol ZnCl 2 Add to the above solution. Finally, 18 mL of freshly prepared aqueous sodium selenosulfate (Na 2 SeSO 3 , by mixing 0.05MSe powder with 0.125M Na 2 SO 3 Reflux at about 80 °C for several hours), 2 g of urea and 0.4 g of PVP were added to the mixture solution of GO and zinc chloride; after the mixture was stirred for 30 min, they were poured into a 50 mL polytetrafluoroethylene-lined autoclave and The reaction was carried out at 180° C. for 12 hours.

[0047] 2) Preparation of electrode: The ZnSe / r-GO composite was dispersed in DMF at a concentration of 2 mg / mL. And drop 30 μL on the surface of the electrode, and dry overnight at room temperature. That is, an electrode modified with a pho...

Embodiment 3

[0054] Detect the potential response in solutions of different concentrations of calcium ions:

[0055] Preparation of polymer membrane ion selective electrode:

[0056] 1) The preparation of the electrode is:

[0057] 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 714s; the thickness of the conductive layer can be controlled by adjusting the current and deposition time.

[0058] 2) Preparation of polymer sensitive membrane solution: by weight percentage, 0.46% calcium ionophore II, 0.48% Borate, 33.2% polyvinyl chloride and 66.04% NPOE were mixed and a total amount of 180 mg of the above...

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Abstract

The invention relates to an electrochemical analysis technology, in particular to a method and device for carrying out potential change detection by utilizing a photoelectrochemical method. An electrode modified with a photosensitive material serves as a working electrode, an ion selective electrode serves as a reference electrode, and pt serves as an auxiliary electrode; the potential of the working electrode is adjusted through the potential of the reference electrode; and the quantitative / qualitative measurement of ions to be detected is realized according to current change outputted by theworking electrode before and after illumination. According to the method disclosed by the invention, with current adopted as output signals, the potential change of the ion selective electrode is measured through the photoelectrochemical method, and therefore, the method is different from a classical potential method. According to the method of the invention, the current method is utilized, ion activity detection can reach a pA level, and therefore, sensitivity is greatly improved.

Description

technical field [0001] The invention relates to an electrochemical analysis technology, in particular to a method and a device for detecting potential changes by using a photoelectrochemical method. Background technique [0002] At present, ion selective electrode (ISE) potential sensors are widely used in clinical diagnosis, industrial analysis and environmental monitoring. Ideally, its potential response follows the Nernst equation. However, this equation has relatively poor sensitivity to small changes in ion activity. Although advanced technologies such as capillary electrophoresis, inductively coupled plasma atomic emission spectrometry, and mass spectrometry can detect ions with high accuracy and precision, there are complex preparation procedures, high costs, extensive experimental experience, and inability to perform on-site measurements. Inherent disadvantages. With the introduction of alternative sensing concepts, new ion-selective readout strategies based on ch...

Claims

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Application Information

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IPC IPC(8): G01N27/49G01N27/333
CPCG01N27/49G01N27/333
Inventor 丁家旺熊晓丽秦伟
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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