Extractive and spectrophotometric determination of palladium (II) using 2-(5-bromo-2-oxoindolin-3-ylidene)hydrazinecarbothioamide as an analytical reagent

Parinita Madan and Barhate V.

Abstract

2-(5- bromo-2- oxoindolin-3-ylidene) hydrazine carbothioamide, [5-Bromoisatin thiosemicarbazone (HBITSC)] extracts palladium (II) quantitatively (99.90%) into n-amyl alcohol from an aqueous solution of pH 0.0 - 4.0 and from 0.1 – 3.0M solution of hydrochloric acid . The n-amyl alcohol extract shows an intense peak at520nm (λ max). Beer’s law is obeyed over the Pd (II) concentration range 1.0 - 30 ug/ml. The molar absorptivity is 7450L mole-1cm- 1 at 520 nm.and Sandel’s sensitivity is 14.3 ng/cm2. The composition of extracted species is found to be 1:2 (Pd : HBITSC) 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 Pd (II) in catalyst samples.