吸光光度法测定碘酸钾的研究  

STUDY ON THE DETERMINATION OF POTASSIUM IODATE BY ABSORPTIOPHOTOMETRY

作　　者：王未肖[1] 高磊红[1] 刘春艳[1] 赵韵琪[1] 

机构地区：[1]河北科技大学理学院,石家庄050018

出　　处：《理化检验（化学分册）》2002年第5期243-244,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：研究了碘酸钾、碘化钾与孔雀石绿在盐酸介质中形成离子缔合物的最佳条件 ,并由此建立了一种测定碘酸钾的新方法。在试验条件下 ,碘酸钾浓度在 0～ 10 μg·ml- 1范围内服从比耳定律 ,线性相关系数为 0 .9991。方法具有简便、灵敏、准确的特点 ,可用于食盐中微量碘的测定。It was found that in a hydrochloric acid medium (0.025～0.10mol·L -1 ), potassium iodate reacts with KI to give KI 3, which further reacts with malachite green forming a binary ion association precipitate C 23 H 25 N + 2·I - 3. Carbon tetrachloride was used as solvent to extract the precipitete formed and its solution in CCl 4 showed an absorption maxima at 630nm. Under the optimum conditions for this reaction system, linear relationship between the absorbancy and concentration of KIO 3 in the range of 0～10μg per mililiter of solution with a relative coefficient of 0.9991 was found. The apparent molar absorptivity was found to be 1.79×10 5L·mol -1 ·cm -1 . Based on these facts, a simple sensitive and accurate absorptiophotometric method for the determination of KIO 3 was proposed and it has been satisfactorily applied to the analysis of table salt.

关 键 词：测定 吸光光度法 孔雀石绿 食盐 碘酸钾 碘 微量分析 

分 类 号：TS37[轻工技术与工程] TS365