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

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 ...

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