Simple on-site quick analyzing method for iodine content in edible salt with potassium iodate

Abstract

The present invention relates to a simple and fast on-site monitoring method for the iodine content of potassium iodate salt, which discloses a qualitative monitoring method, a semi-quantitative monitoring method and a colorimetric quantitative monitoring method, using phosphoric acid reagent or phosphoric acid test paper, potassium iodide reagent or potassium iodide test paper , Potassium dichromate color scale or yellow pigment color scale of permanent iodine salt iodine content standard color scale, the test is accurate, fast, convenient and practical.

Description

Technical field [0001] The invention relates to a method for measuring the iodine content of iodized salt. Background technique [0002] At present, there are many methods for testing the iodine content of iodized salt, which can be summarized into three categories: qualitative testing, qualitative semi-quantitative testing, and quantitative testing. The qualitative testing method is relatively fast. Once the testing reagent is added to the salt sample, it can be done in a few seconds. Knowing whether or not iodized salt, the disadvantage is that the existing standard method of the People’s Republic of China National Standard Food Hygiene Inspection Method GB5009.42-85 reagent is easy to fail and needs to be prepared before use, so it is inconvenient. Qualitative and semi-quantitative tests include reagent method, powder method, and test paper method. These methods are relatively rough and have large measurement errors, and the color is developed on the surface of the solid salt ...

AI Technical Summary

Problems solved by technology

[0002] At present, there are many methods for detecting the iodine content of iodized table salt, which can be summarized into three types: qualitative test, qualitative semi-quantitative test, and quantitative test. The method of qualitative test is relatively fast. Know whether it is iodized salt, the disadvantage is that the existing standard method of the People's Republic of China National Standard Food Hygiene Inspection Method GB5009.42-85 reagent is easy to lose efficacy, and it needs to be prepared before use, so it is inconvenient

Qualitative and semi-quantitative tests include reagent method, powder method, and test paper method. These methods are relatively rough, with large measurement errors, and the color is developed on the surface of the solid salt sample. When the color is very dark, the salt sample cannot be diluted, so it is impossible to judge its iodine content.

Quantitative inspection methods include bromine oxidation capacity method, GB5009, 42-85, direct titration method, colorimetric method, ultraviolet spectrophotometry, etc. The disadvantages are that some reagents are not stable enough, and some need to temporarily prepare standard color columns. More troublesome, some need to use special equipment, which is inconvenient to carry, which makes it difficult to monitor the iodine content of iodized salt on site