甲酚红氧化褪色光度法测定微量碘  

Spectrophotometric Determination of Iodine by Oxidation-Decoloration of Cresol Red

作　　者：陈蓉[1] 杨小红[1] 雷丽红[1] 

机构地区：[1]湖南医学高等专科学校,长沙市410006

出　　处：《光谱实验室》2002年第2期174-176,共3页Chinese Journal of Spectroscopy Laboratory

摘　　要：本文研究了在硫酸介质中 ,碘酸根在 KBr催化作用下氧化甲酚红使其褪色的最佳条件 ,建立了测定微量碘的新方法。最大吸收波长为 5 19.5 nm,表观摩尔吸光系数为 4 .6× 10 4L· mol-1· cm-1,碘酸根测定线性范围为 10— 6 0 μg/2 5 m L。用于测定食盐和碘酸钾片剂中微量碘 。A new method has been developed for determination of the micro amounts of iodine by oxidation decoloration with cresol red.The complex has a maximum absorption at 519.5nm in H 2SO 4 (pH0.55-0.75) with a molar absorptivity of 4.6×10 4L·mol -1 ·cm -1 .Beer's law is obeyed for 10-60μg/25mL of iodine.Good results have been achieved in determining iodine in salt and potassium iodine tablets.

关 键 词：甲酚红 碘酸根 氧化褪色 分光光度法 碘 微量分析 食盐 碘酸钾片剂 

分 类 号：TS37[轻工技术与工程] R977.9[医药卫生—药品]