Use of 2-[{4-(1, 3- benzoimidazole-2- yl) phenyl} imino] -5- nitro phenol as an analytical reagent for extractive spectrophotometric determination of Cu (II)

Abstract

A spectrophotometric method has been developed for the determination of Cu (II) using 2-[{4-(1,3-benzoimidazole-2-yl)phenyl} imino]-5- nitro phenolas an extractive reagent. The reagent forms a coloured complex, which has been quantitatively extracted into n- butanol at pH-5.6 . The method obeys Beer’s law over a range from 1 to 10 ppm. The Molar absorptivity and Sandell’s sensitivity calculated were 0.1899 × 10⁴ LMol^-1cm^-1 and 0.1315 µg cm^-2 respectively. The proposed method is very sensitive and selective. The method has been successfully applied to synthetic and commercial samples.