EXTRACTIVE SPECTROPHOTOMETRIC ETERMINATION OF RHODIUM (III) USING 2-(5- BROMO-2- OXOINDOLIN-3-YLIDENE) HYDRAZINECARBOTHIOAMIDE AS AN ANALYTICAL REAGENT
Borgave S. S. and Barhate V. D.*
2-(5- bromo-2- oxoindolin-3-ylidene) hydrazine carbothioamide, [5-Bromoisatin thiosemicarbazone (HBITSC)] extracts Rhodium (III) quantitatively (99.20%) into n-amyl alcohol. The n-amyl alcohol extract shows an intense peak at 495nm (Î» max). Beerâ€™s law is obeyed over the Rh (III) concentration range 1.0 â€“ 6.0ug/ml. The molar absorptivity is 3345 dm3 mole-1cm-1 at 495 nm and Sandelâ€™s sensitivity is 30.76 ng/cm2. The composition of extracted species found to be 1:3 (Rh: HBITSC) by Jobâ€™s continuous variation and Mole ratio method. Interference by various ions has been studied. The proposed method has been applied for the determination of Rh (III) in synthetic sample.
Keywords: HBITSC, Iridium, Spectrophotometry, Molar Absorptivity.
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