Iodine is a non-metallic element. Adults contain about 20 to 50 mg of iodine, 20% of which is in the thyroid gland. A healthy adult thyroid contains about 8 mg of iodine.
Why is iodine present in the thyroid gland of the human body? This is an important physiological function of iodine. When iodine in food and drinking water is absorbed by the digestive tract in the form of iodide ions, a part of the iodide ions enter the thyroid gland, where they undergo a chemical reaction to form an iodine compound, thyroxine. This thyroxine regulates the oxidation reaction occurring in cells and is an indispensable role in the metabolism of the human body. If a person lacks iodine in his diet, it will cause a disease called "goiter", which causes thyroid enlargement, which in turn oppresses the esophagus and trachea, causing symptoms such as hoarseness and difficulty swallowing. According to relevant information, there are 200 million people with goiter in the world. In terms of regional distribution, there are more inland areas and fewer coastal areas. This is because in the inland areas, soil and air generally contain less iodine, so iodine is absent in water and food. Some inland mountain areas become high-risk areas for endemic goiter.
The situation of iodine deficiency in China is relatively common. The most suitable, most economical and fundamental method for preventing and treating iodine deficiency is salt iodization. Taking the method of salt iodization can effectively increase the content of iodine in the human body and prevent the occurrence of goiter. Through the salt iodization, patients with large necks are now rare, thanks to the benefits of salt iodization. Therefore, the determination of trace iodine in iodized salt is of great significance.
An Lai Lisi recommends the use of iodide ion selective electrode method to measure the iodine content in salt. The specific configuration is: An Lai Lisi PI5100 host, An Lai Si Si iodide electrode IES-006I, An Lerici T2132 temperature electrode, An Lai Li Thinking R2223 reference electrode, 0.1mol/L iodide standard solution, iodide ion intensity regulator.
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