钯、铑和铂的同时分光光度测定

Simultaneous Spectrophotometric Determination of Palladium, Rhodium and Platinum

贵金属混合物光度分析常需分离,同时测定的报导亦少见。本文提出了一种不用分离,不用萃取,不用解联立方程,灵敏、简便同时分光光度测定三种贵金属的方法。 (一)主要仪器和试剂 721分光光度计,钯标准溶液及铂标准溶液(按文献[9]配制)。

A simple, accurate, sensitive, and reliable . method for simultaneous spectrophotometrie determination of palladium, platinum and rhodium in the their mixtures has been suggested. The method involves first, in the medium of EDTA-NaOH the determination of palladium as the red PAR complex without interference from platinum, rhodium and many foreign cations. Then, by the use of the perchloric acid and stannous bromide, both the excess PAR and its palladium complex were decolorized. Rhodium and platinum (as the stannous bromide complexes in the medium of HC1O4) were determined in the remaining solution by dual-wavelength spoctrophotometry and by identical molar absorptivity point methodor modified curve method respectively. The coefficients of varitiouwere 1.0-3.5% (16 results) and recoveries 92-107% when determining a synthetic mixture containing 60μg of palladium, 140μg of platinum and 40μg of rhodium.