铑-钨酸盐-罗丹明B缔合显色反应的研究及应用  

Study on Color Reaction of Ion-associated Complex of Rhodium-tungstate-rhodamine B and Its Application

作　　者：曹秋娥[1] 李祖碧[2] 王加林[2] 徐其亨[1] 

机构地区：[1]云南大学化学系,昆明650091 [2]云南大学成人教育学院,昆明650091

出　　处：《分析试验室》2001年第1期29-31,共3页Chinese Journal of Analysis Laboratory

摘　　要：在聚乙烯醇 (PVA)存在下 ,铑 ( )与钨酸盐及罗丹明 B(RB)形成的离子缔合物在 570 nm处产生最大吸收。建立了测定铑 ( )的光度分析方法 ,其表观摩尔吸光系数 ε达 1 0 7(L·mol-1·cm-1)数量级。方法的检测范围为 0～ 50ng/2 5m L ,检出下限为 0 .2 9ng/2 5m L。大量存在的常见离子对 Rh( )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 (Sn Cl2法 )一致。The ion associated complex formed by rhodium,tungstate and rhodamine B(RB) in the presence of polyvinyl alcohol(PVA) has a maximum absorbance at 570 nm.A sensitive method for determination of Rh(Ⅲ) was developed based on this reaction. Its apparent molar absorptivity is more than 10 7 L·mol -1 ·cm -1 with a linear range is 0～50 ng/25mL Rh(Ⅲ) and detection limit of 0.0114 ng/mL. 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 SnCl 2 method.

关 键 词：铑 罗丹明B 钨酸盐 光度法 测定 催化剂 工业产品 缔合显色反应 

分 类 号：O643.36[理学—物理化学] O614.822[理学—化学]