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Process for making puncture composite sensor for measuring pH and sensor therefor

A composite sensor and sensor technology, applied in the direction of electrochemical variables of materials, etc., can solve the problems of short service life, low precision and easy damage, and achieve the effects of long service life, fast response and stable electrode performance.

Inactive Publication Date: 2008-04-23
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of easy breakage, high internal resistance, low precision and short service life in the above-mentioned prior art, and provide a preparation method of a puncture composite sensor for measuring pH value and a method for measuring pH value. The puncture composite sensor completes the field that cannot be realized in the existing technology, and can directly measure the pH value of solid or semi-solid surfaces and interiors, pastes, colloids, soils and other objects in situ

Method used

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  • Process for making puncture composite sensor for measuring pH and sensor therefor
  • Process for making puncture composite sensor for measuring pH and sensor therefor
  • Process for making puncture composite sensor for measuring pH and sensor therefor

Examples

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preparation example Construction

[0031] The preparation of inner liquid gel (9) is to add 4g agar powder into 100mL saturated potassium chloride KCl solution at a temperature of 25°C, and add 1g of silver chloride AgCl powder to make it precipitate, and stir evenly to prepare A liquid-filled gel (9) is formed; wherein saturated potassium chloride KCl, silver chloride AgCl and silver Ag form a reversible equilibrium system, and agar is the medium for forming the gel.

[0032] The filling liquid gel (9) prepared above is heated to 90 ℃, injects in the glass tube of sensor main body (4) at this temperature, then inserts the clean silver Ag wire into the filling liquid gel of the glass tube ( 9), when it is cooled to room temperature and is gelatinous, it is made into a solid exposed silver-silver chloride reference electrode (8); the pH indicating electrode (1) made above, exposed silver-silver The silver chloride reference electrode (8) and the inner liquid gel (9) are assembled together to form a piercing comp...

Embodiment

[0036]Take a section of 10cm glass tube containing ≤1% boron, which is used for blowing light bulbs, and fill it with 5 grains of antimony with a purity of ≥99.99%, heat the glass tube containing antimony grains and containing boron, and stretch it together with the glass tube When the diameter is Φ=2mm, when it is cooled, the antimony and the glass tube are combined into one, that is, the antimony-glass rod, which becomes the pH indicator electrode; the wall thickness of the glass tube is 0.5mm, and the inner diameter is 3mm;

[0037] Use silver wire with a diameter of 1mm and a purity of ≥99.9% to remove the oxide layer and oil stains, and then clean the surface with 1mol / L sodium hydroxide NaOH solution, 99% acetone solution, 99% ethanol solution and deionized water stand-by;

[0038] At 25°C, add 4g of agar powder and 1g of silver chloride AgCl powder to 100mL saturated potassium chloride KCl solution to make it precipitate, and stir evenly to make the filling liquid gel; ...

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Abstract

This invention discloses a process method and its sensor to measure pH value puncture compound sensor and the method comprises the following steps: 1, to fill stibium 3 with pureness more than 99.99 percent into the glass tube and to extend into pH indicate electrode1;2, to select silver silk with pureness more than 99.99 percent; to add agar powder and silver chloride into the saturate potassium chloride solvent to make inner filled liquid gel 9;to add argent silk into the gel 9 to make solid bare silver chloride reference electrode 8; 3, to assembly sensor and to adhere and integrate the pH indicate electrode of the sensor to the out wall of the sensor body 4 which is located with reference electrode 8 and inner filled gel 9. The reference electrode is located in the inner filled gel 9 and it has the design of an inclined plane with angle less than 75 degrees in the pipe mouth of the down end of the sensor.

Description

technical field [0001] The invention relates to the field of electrochemical pH value testing, in particular to a preparation method of a puncture composite sensor for measuring pH value and the sensor. Background technique [0002] The determination of pH value is the most extensive monitoring project in the fields of chemistry, chemical industry, biology, environment, food, leather, paper and soil. At present, the methods for measuring the pH value at home and abroad all use glass electrodes, and are completely limited to the determination of the pH value of aqueous solutions. However, for the surface and internal pH values ​​of solids, semi-solids, soils, pastes, polymers, and colloids that are common in the above-mentioned fields, it is impossible to directly measure the pH value in situ without damage. It takes a long time to measure the pH value of the extract after dissolving in water, standing still, and filtering, and the error is large. Therefore, in situ direct ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/28G01N27/30G01N27/36
Inventor 杜宝中王俊
Owner XIAN UNIV OF TECH
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