SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF PLATINUM WITH THIOCYANATE AND RHODAMINE 6G

A simple, sensitive spectrophotometric procedure is described for the determination of platinum with rhodamine 6G in the presence of thiocya nate. The absorbance is measured at 575 nm and the molar absorptivity was calculated to be 1.41 x 10(5) l mol(-1)cm(-1). The complex system obeys Beer's law in the range 0-10 mu g of platinum(IV) present in a f inal folume of 25 ml. The effect of pH, as well as of thiocyanate and rhodamine 6G concentration were studied. The method has been applied s uccessfully to the determination of platinum in synthetic mixtures and in the standard platinum activated carbon powder (platinum catalyst).