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研究了在聚乙烯醇存在下,铑与二氯化锡和罗丹明B的显色反应。在0.8—2.0MHCI中,生成紫色离子缔合物。最大吸收波长570—575nm。摩尔吸光系数为1.46×10~5l·mol~(-1)·Cm~(-1)铑含量在1—10ug/25ml内服从比尔定律。研究了多种离子对测定的影响。方法应用于铑—活性炭催化剂中铑的测定,获得了满意的结果。
The color reaction of rhodium with tin dichloride and rhodamine B was studied in the presence of polyvinyl alcohol. In 0.8-2.0M HCl, a purple ion complex is formed. The maximum absorption wavelength 570-575nm. Molar extinction coefficient of 1.46 × 10-5l · mol · cm -1 Rhodium content in 1-10ug / 25ml obey Beer’s law. The effect of various ions on the determination was investigated. The method was applied to the determination of rhodium in rhodium - activated carbon catalyst and satisfactory results were obtained.