A NEW SPECTROPHOTOMETRIC PROCEDURE FOR PLATINUM WITH TIN (II) CHLORIDE

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Abstract
A spectrophotometric procedure has been developed for microgram quantities of platinum utilizing an absorption peak at 310 mμ formed when platinum salts react with tin (II) chloride. The method offers a 5-fold increase in sensitivity over the conventional platinum – tin (II) chloride procedure. Several factors influencing the intensity and stability of the absorbing species, whose nature is unknown, are described. Palladium and rhodium produce gross interferences, but small quantities of iridium, iron, copper, and chromium can be tolerated. The procedure is applicable to fumed sulphuric acid solutions of platinum and to solutions of platinum in nitric acid. The recommended concentration range is 0.4 to 6 p.p.m. when measurements are made in 1.0- cm cells.