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A solid contact ion selective electrode and its preparation and application

An ion-selective, contact-type technology, applied in the direction of material electrochemical variables, material analysis by electromagnetic means, instruments, etc., can solve problems such as limiting the use of organic conductive polymers, and achieve good potential stability and strong anti-interference , the effect of impedance reduction

Active Publication Date: 2020-12-01
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

These limit the use of organic conductive polymers in solid-state ion-selective electrodes

Method used

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  • A solid contact ion selective electrode and its preparation and application
  • A solid contact ion selective electrode and its preparation and application
  • A solid contact ion selective electrode and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The specific preparation steps of the solid contact calcium ion selective electrode are as follows:

[0028] 1) Preparation of sensitive membrane: Preparation of polymer calcium ion selective electrode: Weigh 2mg of calcium ionophore ETH5234, 1mg of ion exchanger NaTFPB, 66mg of polymer PVC matrix, and 132mg of plasticizer o-NPOE in weighing Then measure and add 1.6mL redistilled THF, and stir at room temperature for 2h to obtain a calcium ion-selective membrane solution with uniform concentration.

[0029] 2) Preparation of Ag@AgCl with specific core-shell micro-morphology:

[0030] First measure 15 mL of ethylene glycol into a 25 mL round bottom flask, then weigh 100 mg of PVP into it, and stir the reaction for 1 h in an oil bath at a temperature of 160°C. 0.5 mL of NaBr in ethylene glycol solution (concentration: 2 mM) was quickly added, and the reaction was continued to stir for 5 min. After the stirring is completed, slowly add 1 mL of AgNO dropwise 3 Ethylene g...

Embodiment 2

[0038] The Ag@AgCl / KCl transduced solid-state calcium ion selective electrode prepared above was used for the determination of calcium ions in the solution, first at a concentration of 10 -3 Activated in M ​​calcium chloride solution for 24h.

[0039] When the electrode is used for determination, the solid calcium ion selective electrode transduced by Ag@AgCl / KCl is used as the working electrode, and the saturated calomel electrode connected with 0.1M lithium acetate salt bridge is used as the reference electrode, and the two constitute the test loop system . The prepared solid contact calcium ion selective electrode (GC / Ag@AgCl / KCl / Ca 2+ -ISM) response to calcium ions is recorded by different CaCl 2 The potential response value of the solution was measured. The concentration of the calcium ion solution in the test is 10 -1 -10 -7 M, both composed of CaCl at a concentration of 0.1M 2 The solution was prepared by serial dilution. Data collection is carried out through th...

Embodiment 3

[0042] 1) Preparation of core-shell structure Ag@AgCl:

[0043] First measure 15 mL of ethylene glycol into a 25 mL round bottom flask, then weigh 100 mg of PVP into it, and stir the reaction for 1 h in an oil bath at a temperature of 160°C. Quickly add 0.5mL Na 2 S in ethylene glycol solution (concentration is 2mM), and continue to stir the reaction for 5min. After the stirring is completed, slowly add 1 mL of AgNO dropwise 3 Ethylene glycol solution (concentration: 2mM), after the completion of the addition, continue to stir and react for 30min to obtain the earthy yellow product Ag. The above product was collected by centrifugation, washed three times with ethanol and water respectively, and dried in a vacuum oven at 80° C. for 10 h before use.

[0044] Weigh 10 mg of the prepared Ag nanomaterials, 100 mg of PVP ultrasonically dispersed in 10 mL of deionized water, and then add 2 mL of FeCl with a concentration of 10 mM dropwise under stirring conditions. 3 The aqueous ...

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Abstract

The invention relates to a detection method of ions in a solution, concretely to a solid contact type ion selective electrode and a preparation and an application thereof. An inorganic ion-electron transducing material with redox activity is taken as an ion-electron transducing layer, which adheres to the bottom of an electrode matrix, and a polymer ion selective membrane is supported on the transducing layer so as to obtain the solid contact type ion selective electrode, wherein the material is Ag@AgCl / KCl. According to the invention, the novel inorganic ion-electron transducing layer Ag@AgCl / KCl with high redox capacitance and low resistance is prepared by means of the presence of water molecules in a polymer ion selective membrane microsystem. Moreover, the prepared solid calcium ion selective electrode has the advantages of fast potential response, high stability, no external interference and the like. Therefore, the electrode can be developed into a novel solid ion-electron transducing layer and applied to the preparation and application study of a solid ion selective electrode.

Description

technical field [0001] The invention relates to a method for detecting calcium ions in a solution, in particular to a solid contact ion selective electrode and its preparation and application. Background technique [0002] At present, the research based on the ion-electron transduction layer in solid-state ion-selective electrodes is a hotspot in the research of solid-state ion-selective electrodes. The ion-electron transduction layer based on the redox capacitive transduction mechanism is the earliest transduction layer material studied in solid-state ion-selective electrodes, and the most typical research object is organic conductive polymer. However, organic conductive polymers are sensitive to light during use, and some of their functional groups can react with oxygen. In addition, there is a certain continuity in the redox potential of the organic conductive polymer itself, which can affect the reproducibility of the solid-state ion-selective electrode. These all limi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333G01N27/26
CPCG01N27/26G01N27/333
Inventor 秦伟曾现忠
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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