Extractive spectrophotometric determination of rhodium (III) with isonitroso p-methyl acetophenone phenyl hydrazone

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Isonitroso p-Methyl Acetophenone Phenyl Hydrazone (HIMAPH) extracts Rhodium (III) quantitatively (99.29%) into toluene from on aqueous solution of pH 4.0-6.0 in the presence of 1 ml of 2 M solution of sodium acetate followed by digestion on boiling water bath for 50-60 minutes. The toluene extract shows an intense peak at 465 nm (l max). Beer’s law is obeyed over the Rh (III) concentration range 0.5-16.0 μg/m. The molar absorptivity and Sandell’s sensitivity of coloured species are 2631.58 L mole-1 cm-1 and 0.039 μg. cm-2 respectively. The composition of extracted species is found to be 1:3 (Rh: HIMAPH) by Job’s continuous variation and Mole ratio method. Interference by various ions has been studied. The proposed method has been applied for determination of Rh (III) in Nickel-Rhodium alloy sample.

HIMAPH; Rhodium; spectrophotometery