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.
出处
《分析试验室》
CAS
CSCD
2000年第3期53-55,共3页
Chinese Journal of Analysis Laboratory
关键词
分光光度法
碘酸根
TMB
加碘盐
碘测定
Spectrophotometry
Iodate
3,3′,5,5′ tetramethylbenzidine
Salt
