Extraction spectrophotometric determination of rhodium(III) with o-methylphenyl thiourea

• Main Authors: Y.S. Shelar, S.R. Kuchekar, S.H. Han
• Format: Article
• Language: English
• Published: Elsevier 2015-11-01
• Series: Journal of Saudi Chemical Society
• Subjects: Rhodium(III); o-Methylphenyl thiourea; Mutual separation: palladium(II), rhodium(III), platinum(IV) and iridium(III); Synthetic mixtures
• Online Access: http://www.sciencedirect.com/science/article/pii/S1319610312000609

Trivalent rhodium was determined spectrophotometrically as its 1:2 rhodium o-methylphenyl thiourea (OMPT) complex, extracted into chloroform from aqueous acetate buffer media at pH 5.4. The complex exhibits maximum absorption at 320 nm (Molar absorptivity 9.76 × 103 L mol−1 cm−1), Sandell’s sensitivity 0.0105 μg of rhodium(III) cm−2. Beer’s law obeyed up to 10.0 μg/ml. The method is free from a large number of interferences from cations and anions. The method is simple, selective and reproducible. It permits separation and determination of rhodium(III) from synthetic mixtures corresponding to alloys. A scheme for mutual separation of palladium(II), rhodium(III), platinum(IV) and iridium(III) has been developed.