靛红褪色分光光度法测定食盐中的碘酸根  

Fading spectrophotometric determination of iodate ion in salt with indigo carmine

作　　者：马卫兴[1] 刘英红[1] 沙鸥[1] 朱艳荣[1] 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005

出　　处：《中国调味品》2010年第4期100-102,114,共4页China Condiment

基　　金：江苏省高校自然科学研究计划资助项目(05KJB150003);江苏省海洋生物技术重点建设实验室资助项目(2005HS010)

摘　　要：在溴化钾存在下和盐酸介质中,利用碘酸根氧化靛红,提出了测定碘酸根的新方法——靛红褪色分光光度法,其最大褪色波长位于605nm,在该波长处碘酸根的浓度在5～40μg/10mL之间与其吸光度呈线性关系,其回归方程为A=0.0117C(C的单位:μg)-0.055,相关系数r=0.9987,表观摩尔吸光系数为2.048×104L.mol-1.cm-1,并成功地用于实际加碘食盐样品中碘酸根的测定,测定结果与紫外光度法一致。A new method for determination of iodate ion was proposed in presence of KBr and in HCl media, based on iodate oxidized indigo carmine and made the system decoloring,which of fading maximum absorption wavelength at 605 nm with the mole absorptivity 2. 048 × 10^4 L · mol^-1 · cm^-1. Beers law was obeyed at the range of 5-40μg iodate per 10 mL with the regressive equation of A=0. 0117C （C：μg）-0. 055 as well as the coefficient R of 0. 9987. The proposed method was successfully applied to the determination of iodate in salt samples in agreement with the results obtained by the ultra spec- tropotometrie method.

关 键 词：靛红 褪色分光光度法 碘酸根 食盐 

分 类 号：TS365[轻工技术与工程]