中文摘要：

以Rh（Ⅲ）、钨酸盐及丁基罗丹明B在6．0mol／L硫酸介质和聚乙烯醇（PVA）存在下形成离子缔合物的反应为基础，建立了一个测定Rh（Ⅲ）的光度分析新方法。在优化条件下，体系在589nm处的吸光度与Rh（Ⅲ）的质量浓度在1．2～20．0ng／mL范围内具有良好的线性关系，摩尔吸光系数为5．70×10^6L·mol^-1·cm^-1。方法具有较好的选择性，用于测定催化剂及冶金产品中铑的含量，得到的结果与用标准方法（SnCl2法）测得的结果基本一致。

英文摘要：

A new spectrophotometric method for the determination of Rh （Ⅲ） was developed based on the ion-associated reaction among rhodium （ Ⅲ）, tungstate and butyl rhodamine B in the presence of poly （vinyl alcohol） （PVA） and in 6.0 mol/L H2SO4 medium. The good linear relationship between the absor- bance at 589nm and the concentration of Rh（ Ⅲ ） in the range of 1.2 - 20.0 ng/mL was obtained with the apparent molar absorptivity of 5.70 ×10^6L·mol^-1·cm^-1 The method possesses good selectivity and could be used for the determination of rhodium in the catalyst and metallurgical product. The results obtained by this method were consistent well with those obtained by SnCl2 method.