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Electrochemical sensor of dissolved hydrogen sulfide in extreme exvironment

A high temperature and high pressure, hydrogen sulfide technology, applied in the field of sensors, achieves the effect of low detection limit, small size and easy promotion

Inactive Publication Date: 2004-09-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the previous dissolved hydrogen sulfide detectors can only work at relatively low temperature and pressure. The present invention provides an electrochemical sensor capable of real-time detection and long-term monitoring of the concentration of dissolved hydrogen sulfide in aqueous solution from normal temperature and pressure to high temperature and high pressure. sensor

Method used

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  • Electrochemical sensor of dissolved hydrogen sulfide in extreme exvironment
  • Electrochemical sensor of dissolved hydrogen sulfide in extreme exvironment
  • Electrochemical sensor of dissolved hydrogen sulfide in extreme exvironment

Examples

Experimental program
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Effect test

preparation example Construction

[0009] The so-called Ag / Ag 2 The preparation method steps of S electrode are as follows:

[0010] 1) A polytetrafluoroethylene tube with an inner diameter of 0.3 to 2 mm is injected with silver-containing epoxy resin from one end, and a metal wire is inserted into the epoxy resin from the other end. The epoxy resin is cured at room temperature and polished with fine sandpaper.

[0011] 2) Hang the above-mentioned polytetrafluoroethylene tube vertically on the Ag + In the electroplating tank with KCN solution, connect it to the negative pole of the power supply, place a ring-shaped silver wire at the lower part of the above-mentioned PTFE tube 1-3 cm, connect it to the positive pole of the power supply, and pass a current of 8-12 μA for 30-60 minutes , take out the Teflon tube and rinse it with distilled water;

[0012] 3) Immerse the polytetrafluoroethylene tube in 0.1-0.5M concentration (NH 4 ) 2 S solution for 2 to 6 minutes, rinse with distilled water after taking it ou...

example 1

[0044] Example 1: Making Ag / Ag with silver-containing epoxy resin 2 S electrode

[0045] 1) A polytetrafluoroethylene tube with an inner diameter of 2 mm is injected with silver-containing epoxy resin from one end, and a silver wire is inserted into the epoxy resin from the other end. The epoxy resin is cured at room temperature and polished with fine sandpaper.

[0046] 2) Hang the above-mentioned polytetrafluoroethylene tube vertically on the Ag + In the electroplating tank with KCN solution, connect it to the negative pole of the power supply, place a ring-shaped silver wire at the lower part of the above-mentioned polytetrafluoroethylene tube 1 to 3 cm, connect it to the positive pole of the power supply, and pass a current of 10 μA for 45 minutes. The vinyl fluoride tube was taken out and rinsed with distilled water;

[0047] 3) Immerse the polytetrafluoroethylene tube in 0.3M (NH 4 ) 2 S solution for 2 minutes, then rinse with distilled water after removal.

[0048]...

example 2

[0049] Example 2: Making Ag / Ag with coated silver sheet 2 S electrode

[0050] 1) Take a silver wire with a diameter of 0.5 mm, and weld a piece of silver on one end thereof. The size of the silver sheet is: 0.25 mm in thickness, 6 mm in length, and 3 mm in width;

[0051] 2) Boil the end with the silver piece in acetone to remove organic impurities, then immerse in a nitric acid solution with a concentration of 0.5M, ultrasonically clean it, and clean it with distilled water after taking it out;

[0052] 3) Put the cleaned silver flakes in the concentration of 0.3M (NH 4 ) 2 Immerse in S solution for 2 minutes to form a layer of Ag on the surface of the silver sheet 2 S micro-membranes were rinsed again with distilled water.

[0053] 4) Dissolving the soluble polyimide in an organic solvent to prepare a solution with a concentration of 30%, coating the solution on the silver wire, and air-drying.

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Abstract

An electrochemical sensor for the dissolved HS can be used in the extreme environment has Ag / Ag2S electrode and reference metal / metal oxide electrode. Said Ag / Ag2S electrode has a metallic conducting wire, a teflon tube surrounding said metallic wire, the silver contained epoxy resin between them, and an Ag / Ag2S film covering its end. Said reference electrode has a metal wire with active oxide film on its surface. Its advantages are fast response, high sensitivity and long service life.

Description

technical field [0001] The invention relates to a sensor, in particular to a dissolved hydrogen sulfide electrochemical sensor suitable for high temperature and high pressure. Background technique [0002] Under reducing conditions, the dissolved hydrogen sulfide content is one of the important chemical properties of aqueous solutions. In the chemical, chemical, pharmaceutical, material, and other industries, sulfur is involved in many important synthetic reactions, and the concentration of dissolved hydrogen sulfide in the aqueous medium is a sign of the progress of such reactions. On the other hand, the dissolved hydrogen sulfide concentration in the solution is also an important parameter to understand the natural environment and geological processes, such as the reproduction of microorganisms under reducing conditions, as well as volcanic and hydrothermal activities. Most of the previous dissolved hydrogen sulfide detectors can only work at re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/30
Inventor 叶瑛陈鹰周玉航顾临怡彭懋周怀阳
Owner ZHEJIANG UNIV
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