Potential type microelectrode sensor with universality as well as preparation and application of potential type microelectrode sensor

A micro-electrode and sensor technology, which is applied in the field of potentiometric micro-electrode sensors, can solve the problems of high mechanical strength requirements of the electrodes, and achieve the effects of on-site in-situ detection, low detection limit, and small geometric size

Active Publication Date: 2021-01-12
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]In recent years, the miniature polymer membrane ion-selective electrode that can detect micro-level samples and has a sensitivity as high as picomolar level and low detection limit has been born. Electrode technology, this type of electrode has been successfully used in environmental monitoring and other fields; however, the mechanical strength of the electrode is required to be high when measuring the environment, and there is an urgent need for a universal microelectrode suitable for measuring ion concentrations in the environment

Method used

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  • Potential type microelectrode sensor with universality as well as preparation and application of potential type microelectrode sensor
  • Potential type microelectrode sensor with universality as well as preparation and application of potential type microelectrode sensor
  • Potential type microelectrode sensor with universality as well as preparation and application of potential type microelectrode sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Take the detection of lead ions, and the filling material is disordered mesoporous carbon as an example;

[0068] Preparation of potentiometric microelectrode sensors:

[0069] 1. First, according to the existing method, one end of a capillary glass tube with an outer diameter of 1 mm and an inner diameter of 0.58 mm is drawn so that the tip is 10 microns. Immerse the capillary glass tube with N,N-dimethyltrimethylsilylamine, silanize it in an oven at 150 degrees Celsius for 3 hours, then take it out and let it cool to room temperature.

[0070] Fill the capillary glass tube obtained above with disordered mesoporous carbon until the tip is full, so that the length of the disordered mesoporous carbon in the tube is 2 cm, then immerse the tip in the ion-selective sensitive membrane solution, and use capillary action to dissolve the membrane solution Inhaled into the capillary tube and mixed with disordered mesoporous carbon ( figure 1 ).

[0071] The ion-selective sens...

Embodiment 2

[0081] Taking the detection of lead ions as an example, the microelectrode filling material is disordered mesoporous carbon, the ion-selective sensitive membrane is the same as that described in Example 1, and the preparation of the potentiometric microelectrode sensor:

[0082] 1. First, according to the existing method, one end of a capillary glass tube with an outer diameter of 1 mm and an inner diameter of 0.58 mm is drawn so that the tip diameter is 10 microns. Immerse the capillary glass tube with N,N-dimethyltrimethylsilylamine, silanize it in an oven at 150 degrees Celsius for 3 hours, then take it out and let it cool to room temperature.

[0083] Fill the capillary glass tube obtained above with disordered mesoporous carbon until the tip is filled, so that the length of the disordered mesoporous carbon in the tube is 2 cm, then immerse the tip in the ion-selective sensitive membrane solution, and use the capillary action of the capillary to dissipate the The membrane ...

Embodiment 3

[0091] Taking the detection of lead ions, the filling material is disordered mesoporous carbon, the ion-selective sensitive membrane is the same as that described in Example 1, and the detection environmental sample is actual seawater as an example. The specific detection steps are as follows:

[0092] 1. First, according to the existing method, one end of a capillary glass tube with an outer diameter of 1 mm and an inner diameter of 0.58 mm is drawn so that the tip is 10 microns. Immerse the capillary glass tube with N,N-dimethyltrimethylsilylamine, silanize it in an oven at 150 degrees Celsius for 3 hours, then take it out and let it cool.

[0093] Fill the capillary glass tube obtained above with disordered mesoporous carbon until the tip is filled, so that the length of the disordered mesoporous carbon in the tube is 2 cm, then immerse the tip in the ion-selective sensitive membrane solution, and use the capillary action of the capillary to dissipate the The membrane solu...

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Abstract

The invention relates to a potential type microelectrode sensor, in particular to a potential type microelectrode sensor with universality as well as preparation and application of the potentiometricmicroelectrode sensor. The sensor is a selective microelectrode with one tip end; a conductive material is inserted into the microelectrode, and the tip is sequentially filled with a mixed layer of anion selective sensitive film and a solid conduction material, a solid conduction material layer and a sealing layer. The porous carbon material serves as an ion electron conduction layer and also serves as a carrier of the membrane, and the developed sensitive membrane sensor has the advantages of being easy and convenient to manufacture, high in sensitivity, low in cost, easy to miniaturize andthe like. Besides, compared with an existing liquid membrane microelectrode, the solid contact type sensitive membrane microelectrode has the advantages of being high in response speed, good in stability, long in service life and the like, on-site in-situ analysis of various ions in single cells, plant root systems and sediments can be achieved, and a new thought is provided for real-time monitoring of the environmental process and the environmental toxicology plasma change flux.

Description

technical field [0001] The invention relates to a potential-type micro-electrode sensor, in particular to a universal potential-type micro-electrode sensor and its preparation and application. Background technique [0002] Electrochemical microelectrodes include current-mode microelectrodes and potential-mode microelectrodes. Current-type microelectrodes: Dissolved oxygen in pore water, Mn 2+ , Fe 2+ and S(-Ⅱ) amperometric Hg-Au microelectrode in situ detection system. However, it has not been used in the in situ determination of other heavy metal ions, mainly due to the interference of dissolved oxygen and the low sensitivity of the electrode. Potential microelectrodes: Potential microelectrodes based on metal platinum are mostly used for pH detection; potential microelectrodes based on liquid membranes can be used for Cl in pore water - , Na + , K + and Ca 2+ High-concentration ion detection is currently only used for laboratory research and test analysis. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
CPCG01N27/3335
Inventor 丁家旺高杨秦伟
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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