Spectrophotometric determination of trace amount of ce (iv) metal ion by using 3-(2-hydroxyphenylimino) indolin-2-one as an photometric reagent, hpi2o

A 3-(2-Hydroxylphenylimino) indolin-2-one [HPI2O] is use as a reagent for the extractive spectrophotometric determination of Cerium. The reagent HPI2O gave instantaneous and stable brown colour complex with Cerium at pH 5.0. The colour reaction in detail has been explored and the possibility of photometric determination of the micro amounts of Cerium is established with necessary conditions. A linear calibration graph over the concentration range 1 ppm to 12 ppm was obtained by applying the spectrophotometric method at wavelength 430 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 Sandell’s Sensitivity is 0.0303 µg cm-2 with molar absorptivity 4623.92 L mol-1 cm -1. The results of the prescribed procedure applied for the determination of the micro amounts of Ce (IV) in various synthetic and standard steel samples are presented.