Separation and Determination of Platinum Metals and Some Transition Metals by Reversed-Phase High-Performance Liquid Chromatography

摘要

A new reagent, 2-(6-methyl-2-benzothiazolylazo)-5-diethylaminophenol (MBTAE), which was synthesized for the first time by us, was used as a precolumn derivatizing reagent in the determination of platinum metals and some transition metals by reversed-phase HPLC. The effects of the composition and general properties of the mobile phase, column temperature and foreign ions on the retention behavior of the metal-MBTAE complexes are discussed in detail. The platinum metals and some transition metals can be separated on a Spherisorb C8 column at a detection wavelength of 575nm using a 73/27(v/v) methanol/water containing 20mmol/l pH 6.0 acetate buffer and 12mmol/l malic acid as the mobile phase. The detection limit of each metal ion is as follows (ng); Ru 1.77, Rh 0.057, Pd 0.17, Os 0.89, Ir 0.47, Pt 0.55, Co 0.18 and Ni 0.06, respectively, when the signal-to-noise ratio is 2. This method has been used to analyze mineral and anode slime samples. The results correspond to the certified values, and quantitative metal recoveries were obtained