钍试剂Ⅰ分光光度法测定痕量碘  

Spectrophotometric Determination of Trace Iodine with Thorin

作　　者：翟好英[1] 黄侠[1] 黄成华[1] 谭学蓉[1] 

机构地区：[1]内江师范学院化学与生命科学学院,四川内江641112

出　　处：《内江师范学院学报》2009年第8期62-64,共3页Journal of Neijiang Normal University

基　　金：内江师范学院青年基金项目资助(07NJZ-08)

摘　　要：在6．0mol·L^-1 HCl介质中，碘酸根在KBr的催化作用下氧化钍试剂Ⅰ而使之褪色，且褪色程度与碘酸根含量呈线性关系，据此建立了一种测定痕量碘的新方法．实验结果表明：钍试剂Ⅰ的最大吸收波长为480nm，KIO3浓度在0．0214-8．56μg·mL^-1范围内与△A480nm之间基本符合比尔定律，其表观摩尔吸光系数ε为2．45×10^4L·mol^-1·cm^-1．该方法可直接用于测定食盐中痕量碘．A new method of determination of trace amounts of iodine in edible salt was proposed. The method was based on oxidation-decoloration of thorin by iodate with KBr as the catalyst in the medium of 6.0 mol·L^-1 HCl. The results showed that the maximum absorption wavelength of thorin Ⅰ is at 480 nm. and basically conforms to Bill＇s law when KIO3 concentration stays in the range of 0.0214-8.56μg·mL^-1 and △A480nm. The apparent molar absorptivity is 2.45×10^4L·mol^-1·cm^-1. The method can be directly employed in the determination of trace iodine in table salt with desirable results.

关 键 词：钍试剂Ⅰ 碘 分光光度法 

分 类 号：O657.32[理学—分析化学]