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Anti-interference metal/metal oxide pH electrode and preparation method

An oxide, anti-interference technology, applied in the direction of material analysis, measuring devices, instruments, etc. through electromagnetic means, can solve the problems of pH response signal interference, poor anti-interference ability of pH electrodes, etc., and achieve high mechanical strength and toughness, low cost Inexpensive, high biophilic effect

Inactive Publication Date: 2006-11-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, metal / metal oxide pH electrodes have poor anti-interference ability, and reducing and oxidizing ions in natural water will interfere with the pH response signal

Method used

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  • Anti-interference metal/metal oxide pH electrode and preparation method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Example 1: Ti / TiO 2 Fabrication of the pH electrode

[0027] 1) Take a Ti wire with a diameter of 0.6mm, polish its surface with sandpaper, scrub it with alcohol, cut it into a length of 1.2cm, and weld one end of the Ti wire with a gold wire with a diameter of 0.6mm as a physical connection of the electrical signal;

[0028] 2) Dip Ti wire into Na 2 o 2 In the melt for 2 minutes, a black oxide film is formed on the surface. After taking it out, cool it to room temperature, soak it in deionized water for 1 day, and dry it for later use;

[0029] 3) Dip the Ti wire covered with the oxide film into the perfluorosulfonic acid resin solution with a concentration of 5% by weight, take it upside down, so that the excess solution flows towards the rear, to keep the coating thickness even, at 60 After drying in an oven at ℃, repeat twice;

[0030] 4) Put the Ti wire coated with perfluorosulfonic acid resin film in a nitrogen-filled container, raise the temperature to 70°C,...

example 2

[0032] Example 2: Zr / ZrO 2 Fabrication of the pH electrode

[0033] 1) Take a Zr wire with a diameter of 0.1 mm, polish its surface with sandpaper, scrub it with alcohol and cut it into a length of 0.6 cm. Weld one end of the Zr wire with a silver wire with a diameter of 0.1 mm as a physical connection of the electrical signal;

[0034] 2) Dip the Zr wire into Na 2 o 2 In the melt for 5 minutes, a black oxide film is formed on the surface. After taking it out, cool it to room temperature, soak it in deionized water for 2 days, and dry it for later use;

[0035] 3) Dip the perfluorosulfonic acid resin solution that is 10% by weight with the Zr wire coated with the oxide film, take it upside down after taking it out, so that the excess solution flows towards the rear, to keep the coating thickness even, at 60 Repeat once after drying in an oven at ℃;

[0036] 4) Put the Zr wire coated with perfluorosulfonic acid resin film in a nitrogen-filled container, raise the temperatu...

example 3

[0038] Example 3: W / WO 3 Fabrication of the pH electrode

[0039] 1) Take a W wire with a diameter of 0.3mm, polish its surface with sandpaper, scrub it with alcohol, cut it into a length of 0.8cm, and weld one end of the Zr wire to a copper wire with a diameter of 0.3mm as a physical connection of the electrical signal;

[0040] 2) Dip the Zr wire into Na 2 o 2In the melt for 6 minutes, a black oxide film is formed on the surface. After taking it out, cool it to room temperature, soak it in deionized water for 1 day, and dry it for later use;

[0041] 3) Dip the perfluorosulfonic acid resin solution with a concentration of 6% by weight with the W wire coated with the oxide film, take it upside down after taking it out, so that the excess solution flows towards the rear, to keep the coating thickness even, at 80 Repeat once after drying in an oven at ℃;

[0042] 4) Put the W wire coated with perfluorosulfonic acid resin film in a container with nitrogen gas, raise the tem...

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Abstract

The invention discloses an anti-interference metal / metal oxide pH electrode and the preparing method, adopting metal wire with stable chemical properties as substrate, immersing the metal wire in the melted sodium peroxide for several minutes and forming hydrogen ion-sensitive active oxide film on the surface of the metal wire, then using fluorinated sulfonic acid resin to coat the active oxide film and forming hydrogen ion selective semipermeable membrane, which can transmit protons but stop other anions and cations outside, thus avoiding their interferences to pH electrode and simultaneously largely prolonging pH electrode service life. And the pH electrode has advantages of small bulk, high mechanical strength, and wide application range, etc, and the preparing method has simple process and low cost. And it has application values in the fields, such as chemical synthesis, dynamic monitoring of various power stations and waste management.

Description

technical field [0001] The invention relates to an anti-interference metal / metal oxide pH electrode and a preparation method. Background technique [0002] The pH value is the logarithm of the reciprocal of the hydrogen ion activity in water. It is an indispensable and important parameter in the field of aqueous solution, from metal smelting, plant growth, environmental protection, geological exploration, to medical care, genetic research, and space exploration. Do not open the determination of pH value. It is not only related to many synthetic reactions in the fields of chemistry, chemical engineering, medicine, materials, etc., but also an important parameter for understanding the natural environment and geological functions. [0003] There are many types of pH sensors (such as glass electrodes, metal / metal oxide type electrodes, polymer coated electrodes, solid electrolyte type electrodes, ion selective field effect transistors, optical fiber sensors, etc.), among which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
Inventor 叶瑛黄霞邬黛黛蒋淑华陈鹰杨灿军金波
Owner ZHEJIANG UNIV
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