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A method is described for the spectrophotometric determination of platinum (IV) with 2-oximino-1-indanone based on solvent extraction of Pt:2-oximino-1-indanone complex. The 2-oximino-1-indanone reacted with Pt(IV) to form a dark-orange complex which shows a characterisic maximum absorption at 342nm. The optimum PH for the platinum extraction lies between 5.4~8.0. Beer’’s law obeys up to 0.98~16.3ppm of platinum (IV) and the molar absorption coefficient is 1.06 X 104L. mol-1. cm-1. The relative standard deviation of the method was +/-2.1%. The composition of the complex is estimated to be Pt:In = 1:1, by the mole ratio method and ion exchange resin experiment. The optimum condition for the determination of platinum has been studied in detail. The 2-oximino-1-indanone is found to be a selective reagent for the determination of platinum, since the synthesized 2-oximino-1-indanone did not react with other metals such as cobalt, cadmium, copper, manganese, nickel, iron, lead and zinc, to form the complex. In this studies, we have also clarified Sindhwani and Singh’’s spectrophotometric determination data of various metals with acenaphthenequinone monooxime (Talanta 20,248, 1973), whose results were not correct.
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