Abstract

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SPECTROPHOTOMETRIC DETERMIATION OF RHODIUM USING PHENANTHRAQUINONE MONOTHIOSEMICARBAZONE

P. P. Sinha, S. K.S. Tomar


Phenanthraquinone monothiosemicarbazone forms a brown colored insoluble chelate with rhodium (iii) on heating on water bath in the pH range 4.4-6.1.The chelate is soluble in DMF and has maximum absorbance at 510 nm. The system obeys Beer’s law up to 12.88ppm of rhodium. The optimum concentration range for the determination of rhodium is 2.4-10.0 ppm. Sensitivity of the reaction is 1.3 × 10-2µg Rh/cm2. The method has few advantages over other known methods