Method for preparing iodine ion selective electrode crystal film by employing high-temperature melting method

A high-temperature melting and iodide ion technology, applied in the field of analytical chemistry, can solve the problems of low internal density, poor anti-interference ability, and poor consistency of the crystal film, and achieve flexible and diverse processing methods, low cost, and simple manufacturing.

Inactive Publication Date: 2013-09-18
郑静雨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The technical problem to be solved in the present invention is to propose the concept or process of "using silver sulfide as a vulcanizing agent to carry out 'high-temperature vulcanization' of silver iodide under the condition of high-temperature melting; at the same time, carrying out 'smelting and purification' of silver iodide under the condition of high-temperature melting" , the design provides a high-temperature melting method to produce iodine ion selective electrode crystal film, which solves the problem of poor selectivity coefficient, poor anti-interference ability, low internal density of the crystal film and easy Unsatisfactory performance indicators caused by factors such as tiny gaps or cracks, poor consistency in mass production and other technical problems, meet the requirements of direct testing of human urine iodine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 15 grams of analytically pure silver iodide to the crucible and heat it to 560°C until it melts, add 0.75 grams of analytically pure silver sulfide, mix and melt it and heat it to above 790°C, then perform high-temperature sulfuration on the silver iodide for 10 minutes, smelt for 5 minutes, remove impurities, and polish it clean The silver wire is immersed in the silver iodide that has been treated and purified by silver sulfide at high temperature, the silver wire is taken out, and the surface is dipped with silver iodide, and slowly cooled to room temperature, the lead wire is welded on the silver wire, and the electrode rod and the sealant are connected. , for the test of iodide ion.

Embodiment 2

[0045] Add 15 grams of analytically pure silver iodide to the crucible and heat to 560°C until melting, add 0.75 grams of analytically pure silver sulfide, mix and melt, heat to above 790°C, and then carry out high-temperature sulfidation of silver iodide for 10 minutes, smelting for 5 minutes, remove impurities, and put it into a spray gun , keep the melting temperature, spray it on the polished and clean silver sheet, the surface is sprayed with silver iodide that has been treated and purified by silver sulfide high temperature sulfide treatment, slowly cool to room temperature, solder the lead wire on the silver sheet, connect Electrode rod and sealant, used for the test of iodide ion.

Embodiment 3

[0047] Add 15 grams of analytically pure silver iodide to the crucible and heat it to 560°C until it melts, add 0.75 grams of analytically pure silver sulfide, mix and melt it and heat it to above 790°C, then carry out high-temperature sulfidation of silver iodide for 10 minutes, smelt for 5 minutes, remove impurities, and obtain sulfide The silver iodide that has been vulcanized and purified at high temperature is poured into a mold to form it, bonded to the silver sheet with conductive glue, welded the lead wire, connected the electrode rod and the sealant, and used for the test of iodide ion.

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PUM

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Abstract

The invention discloses a method for preparing an iodine ion selective electrode crystal film by employing a high-temperature melting method. The method comprises the following steps: melting silver iodide (AgI) at high temperature, adding silver sulfide with a certain ratio (Ag2S) for performing high-temperature sulfuration reaction on the AgI, so that the AgI is separated from impurities, the ductility or the toughness of the AgI is enhanced, the problems that an iodine ion selective electrode of a crystal film prepared by using a powder compaction method is low in selectivity coefficient and low in interference resistance, gaps and cracks are generated in the crystal film and the like are solved, the selectivity coefficient of iodine ions on chloride ions is 10<-6> to 10<-7>, other impurities in a urine sample do not interfere the test, and the crystal film can be directly used for testing human urine iodine.

Description

technical field [0001] The invention belongs to the field of analytical chemistry and relates to a high-temperature melting method for preparing iodide ion selective electrode crystal membranes. Background technique [0002] An appropriate amount of iodine is very important to human health and growth and development, but the prevention and treatment of diseases caused by iodine deficiency or excess iodine has always been based on optical detection methods. It is limited to the laboratory and cannot be popularized and applied. At present, many countries, including China, have adopted a unified iodine supplement policy of adding iodized salt to prevent and treat iodine deficiency diseases. However, affected by factors such as population and regional differences, the unified iodine supplement policy of salt iodization has brought the disadvantages of excessive iodine in some areas or specific groups of people. Finding a scientific and simple detection method has long puzzled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
Inventor 不公告发明人
Owner 郑静雨
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