EXTRACTIVE SPECTROPHOTOMETRIC STUDIES OF ACETOPHENONE 2?, 4?-DIHYDROXY THIOSEMICARBAZONE WITH IRON

Abstract

Author(s): P. K. Rana*, R. S. Lokhande, S. M. Pitale, S.P. Janwadkar, P. S. Navarkar, D. K. Yadav

Acetophenone 2’, 4’-Dihydroxy thiosemicarbazone (APDHTS) as a reagent for the extractive spectrophotometric determination of Iron. The reagent APDHTS gave instantaneous and stable violet colour with Iron at pH 5.0. A linear calibration graph over the concentration range 1 ppm to 10 ppm with a 3σ limit of detection of 0.66 ppm was obtained by applying the spectrophotometric method at wavelength 370 nm. The stoichiometry of the complex is established as 1:1 (M: L) by Job’s method of continuous variation and confirmed by mole ratio method. The standard deviation and the coefficient of variations are presented. The molar absorptivity and Sandal’s sensitivity of the complex is 0.4469 x 103 L mol-1 cm –1 and 0.0125 µg cm-2 respectively. The results of the prescribed procedure applied for the determination of the micro amounts of Fe (III) in various synthetic and standard steel samples are presented.