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Integrated type dissolved oxygen, PH and salinity sensor and its manufacturing method and use method

A production method and dissolved oxygen technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of high operation intensity and maintenance cost, large equipment investment, etc., and achieve miniaturization and miniaturization, good working performance, The effect of high mechanical strength and toughness

Inactive Publication Date: 2004-05-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of three instruments not only requires a large investment in equipment, but also high operating intensity and maintenance costs

Method used

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  • Integrated type dissolved oxygen, PH and salinity sensor and its manufacturing method and use method
  • Integrated type dissolved oxygen, PH and salinity sensor and its manufacturing method and use method
  • Integrated type dissolved oxygen, PH and salinity sensor and its manufacturing method and use method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] Example 1: Ir / IrO 2 Production of pH electrode

[0041] 1) Take Ir wire with a diameter of 0.15 mm, after mechanical polishing to remove the oxide film, place it in a corundum crucible and cover it with anhydrous lithium carbonate powder; place the crucible in a muffle furnace and heat it to 780°C and keep it at a constant temperature 5 hours;

[0042] 2) After cooling to room temperature, dissolve the solid lithium carbonate in the crucible with 1M HCl, and then wash with deionized water to remove the soluble components. The Ir wire is moved to an oven at a temperature of 80°C and dried overnight. The surface is covered with black dense IrO 2 Floor;

[0043] 3) Scrape off the oxide layer about 1 mm long on one end of the Ir wire. A gold wire with a diameter of 0.1 mm is welded on this end as a circuit and physical connection.

example 2

[0044] Example 2: Fabrication of Ag / AgCl reference electrode

[0045] Take a suitable length of silver wire, put 3 grams of AgCl powder in a 5mL platinum crucible, heat it on an alcohol lamp until it melts, immerse one end of the silver wire in the melt for a few seconds, take it out, and cool it to room temperature. .

example 3

[0046] Example 3: Fabrication of Ag / AgCl reference electrode

[0047] 1) Add 100mL of 0.1M HCl in a 200mL beaker;

[0048] 2) Take two silver wires and connect them to the positive and negative electrodes of the 2.4V DC power supply. Dip one end about 1 cm into the 0.1M hydrochloric acid solution and turn on the current. Take it out after 20 minutes and connect it to the positive electrode. The surface of the silver wire is plated with a uniform AgCl film, rinsed with distilled water, and dried.

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Abstract

An integrated dissolved oxygen, pH and salinity sensor is composed of working Ir / IrO2 electrode, reference Ag / AgCl electrode, metallic anode and metallic cathode. Its application method features that when external electric field is cut off, the potential difference V1 between said working electrode and reference electrode is relative to the pH value of the solution to be measured, and when an external electric field is applied, the electric resistance of the solution between said anode and cathode is relative to the salinity of said solution while said potential difference is changed from V1 to V2. The V2-V1 is relative to the content of oxygen dissolved in solution.

Description

Technical field [0001] The invention relates to an integrated dissolved oxygen, pH and salinity sensor and a method of making and using the same. Background technique [0002] Acidity, salinity, and dissolved oxygen content are important parameters for the properties of the reaction aqueous solution. In environmental research, as well as chemistry, chemical engineering and other fields, it is usually necessary to simultaneously measure the dissolved oxygen, pH and salinity in water bodies. At present, different instruments are needed to measure these parameters, namely, dissolved oxygen meter, pH meter and conductivity meter. The use of three instruments not only requires a large investment in equipment, but also high operation intensity and maintenance costs. Since the traditional dissolved oxygen meter uses Clark type electrodes, the activity of the component to be measured is reflected in the current intensity between the electrodes, while the pH meter u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/333
Inventor 叶瑛陈鹰邬黛黛黄霞周怀阳杨灿军陈慧明陈宁华
Owner ZHEJIANG UNIV
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