SPECTROPHOTOMETRIC DETERMINATION OF RUTHENIUM(III) AND RHODIUM(III) WITH 9,10-PHENANTHRENEQUINONE MONOXIME AFTER EXTRACTION INTO MOLTEN NAPHTHALENE.

Abstract

9,10-Phenanthrenequinone monoxime has been used as a reagent for the spectrophotometric determination of ruthenium(III) and rhodium(III) after extraction into molten naphthalene. The extracted mixture of the metal complex and naphthalene was dissolved in chloroform and ruthenium and rhodium were determined spectrophotometrically. Beer's law holds in the concentration range of 0. 2-4. 1 mu g/cm**3 for ruthenium and 0. 3-5. 3 mu g/cm**3 for rhodium in 10 cm**3 of the final solution. Interference of various ions has been studied and the method has been applied to the determination of ruthenium and rhodium in various synthetic mixtures. This procedure is also applied to the simultaneous determination of ruthenium and rhodium present together in a solution.