碘酸根与3,3′,5,5′-四甲基联苯胺的显色反应研究及其分析应用  

Colour reaction of Iodate with 3,3′,5,5′Tetramethylbenzidine and Its Analytical Application

作　　者：赵康[1] 蒋正静[2] 朱利明 李文遐[1] 

机构地区：[1]苏州大学化学系,苏州215006 [2]淮阴师范学院化学系,淮阴223001

出　　处：《分析试验室》2000年第3期53-55,共3页Chinese Journal of Analysis Laboratory

摘　　要：研究了碘酸根与 3,3′,5 ,5′-四甲基联苯胺 (TMB)的显色反应 ,建立了测定微量碘的分光光度法。在盐酸介质中 ,碘酸根能定量氧化 TMB生成黄色的TMB亚胺盐 ,其最大吸收波长为 45 0 nm,表观摩尔吸光系数为 2 .13× 10 5 L·mo1-1·cm-1 ,碘的质量浓度在 0～ 0 .7mg/ L 范围内符合比尔定律 。A new spectrophotometric method for the determination of trace iodate was developed, based on the reaction of iodate with 3,3′,5,5′ tetramethylbenzidine(TMB).In the medium of HCl, when TMB is oxidized by iodate, a yellow imine is formed and gives a strong absorption at 450 nm ,its apparent molar absorptivity is 2.13×10 5 L·mol -1 ·cm -1 . Beer's law is obeyed in the range of 0～0.7mg/L for iodine. The method was applied to the determination of trace iodine in salt with potassium iodate added with satisfactory results.

关 键 词：分光光度法 碘酸根 TMB 加碘盐 碘测定 

分 类 号：TS365[轻工技术与工程] TS312