铑-钨酸盐-甲苯胺蓝体系的共振光散射法测定铑(Ⅲ)  

Determination of rhodium(Ⅲ) by resonance light scattering spectrometry in rhodium-tungstate-toluidine blue system

作　　者：赵霞[1] 方卫[2] 杨明惠[1] 杨志毅 

机构地区：[1]大理学院生命科学与化学学院,云南大理671000 [2]昆明贵金属研究所,云南昆明650031

出　　处：《冶金分析》2008年第12期23-26,共4页Metallurgical Analysis

基　　金：云南省教育厅科学研究基金(07Z10786)

摘　　要：在聚乙烯醇（PVA）存在下，铑（Ⅲ）与钨酸盐及甲苯胺蓝（TB）形成离子缔合物，在362nm处产生强烈的共振瑞利光散射现象，据此建立了一个共振光散射法测定铑的新方法。研究了该体系的最佳反应条件。在优化的条件下，铑（Ⅲ）的质量浓度在0．0016～0．04ng／mL范围内与散射光增强强度（△I）具有良好的线性关系，方法的检出限为0．0013ng／mL。大量存在的常见离子对铑（Ⅲ）的测定不干扰。方法用于测定催化剂及工业产品中铑，结果与其他方法测定值基本一致，相对标准偏差为1．06％～2．05％，回收率为97%～103％。In the presence of polyvinyl alcohol（PVA）, rhodium（Ⅲ） reacts with tungstate and toluidine blue （TB） to form an ionic complex, an intensive signal of the resonant scattering light from the ionic complex is observed at 362 nm. On the basis of this fact, a resonance light scattering spectrometry for the measurement of trace rhodium（Ⅲ） has been established. Under the optimum conditions, a good linear relationship between the scattering intensity （△I） and the concentration of rhodium（Ⅲ） in the range of 0. 001 6-0.04 ng/mL was found with the detection limit of 0. 001 3 ng/mL. The measurement of Rh（Ⅲ） was free from the interference of other common ions. The method has been used to determine rhodium in some systems of catalysts and industrial productions with the RSD of 1.06%-2.05% and the recovery of 97%-103%, the results are in agreement with those obtained by the other method.

关 键 词：铑 钨酸盐 甲苯胺蓝 共振光散射技术 

分 类 号：O657.32[理学—分析化学]