铑-钨酸盐-番红花T缔合显色反应的研究及应用  

Study on Color Reaction of Ion-associated Complex of Rhodium- tungstate Cotton Red T and Its Application

作　　者：赵霞[1] 周俊[1] 白莹[2] 李珍贵[1] 

机构地区：[1]大理学院生命科学与化学学院,云南大理671000 [2]昆明学院小学教育系,云南昆明650202

出　　处：《大理学院学报（综合版）》2009年第4期52-54,共3页Journal of Dali University

基　　金：云南省教育厅科研基金资助项目(07Z10786)

摘　　要：在聚乙烯醇（PVA）存在下,铑（Ⅲ）与钨酸盐及番红花T（ST）形成的离子缔合物在480nm处产生最大吸收。据此建立了测定铑（Ⅲ）的光度分析方法,其表观摩尔吸光系数ε达10^8L.mol^-1.cm^-1数量级。方法的检测范围为0.15-1.5ng/25ml。大量存在的常见离子对Rh（Ⅲ）的测定不干扰。用此方法测定了催化剂及工业产品中铑的含量,结果与标准方法（SnCl2法）一致。The ion-associated complex formed by rhodium, tungstate and Cotton Red T （ST）in the presence of polyvinyl alcohol （PVA） has a maximum absorbanee at 480 nm. A sensitive method for determination of Rh（III ） was developed based on this reaction. Its apparent molar absorptivity is more than 108 L·moL^-1·cm^-1 with a linear range of 0.15-1.5 ng/25ml Rh（IIl）. Other ions in samples did not interfere the determination of rhodium. The results for determination of rhodium in real samples obtained by this method were consistent well with those obtained by SnCl2 method.

关 键 词：铑 番红花T(ST) 钨酸盐 光度法 

分 类 号：O657.3[理学—分析化学]