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碘是人体必要的一种元素,它体内参与合成甲状腺素,每一个甲状腺素分子中含有四个碘原子。缺碘会导致甲状腺机能亢进,引起甲状腺肿大。本文利用微量碘对砷(Ⅲ)-铈(Ⅳ)氧化还原反应的催化作用,以番木鳖碱为抑制剂和显色剂,直接测定它与经一定的反应时间后剩余量的铈(Ⅳ)所形成的红色配合物的吸光度,以此吸光度的对数值对碘含量作图即得标准曲线。测定范围为0—4ng·ml~(-1),相对标准偏差为1.11％,平均回收率为98.5％。
Iodine is an essential element of the body, it is involved in the synthesis of thyroxine in the body, each containing four thyroid hormone iodine atoms. Iodine deficiency can lead to hyperthyroidism, causing thyroid enlargement. In this paper, the catalytic effect of trace amounts of iodine on the redox reaction of arsenic (Ⅲ) -cell (Ⅳ) was studied. With the use of strychnine as the inhibitor and the reagent, the amount of cerium (Ⅳ) remaining after a certain reaction time ) Formed by the absorbance of the red complex, the absorbance of the logarithm of the iodine content of the plot that the standard curve. The determination range was 0-4ng · ml -1, the relative standard deviation was 1.11% and the average recovery was 98.5%.