Determination of trace amounts of platinum by derivative spectrophotometryafter column separation of palladium

The determination of trace amounts of platinum(IV) based on the ion associa tion compounds between a multicharged thiocyanate complex (containing Pt(IV )) and the hydrophobic basic dye-Rhodamine 6G by first derivative spectrome try is proposed. The method is characterised by high sensitivity (epsilon = 1.13 . 10(5) l . mol(-1) . cm(-1)) and low detection limit (0.022 mg . l(- 1) Pt). The influence of matrix cations on the determination of platinum ha s been studied. Due to the serious interferences caused by palladium on the spectrometric determination of platinum the separation procedure of those metals by solid phase extraction technique on Cellex-T resin has been optim ised.