Abstract

Md. Faridur Rahman¹*, Biswajit Chakraborty² and Tanmoy Das¹

DOI : http://dx.doi.org/10.13005/ojc/320328

A new azo dye Schiff base analytical reagent, namely N, N′-bis(5-(4-nitrophenyl)diazenyl)-2-hydroxybenzylideneamino)ethylenediimine (NDHBDED) has been synthesized and it was impregnated with alumina for extractive determination of metal ions. In this report the solid sorbent matrix was used for the extraction of Co (II) and Ni (II) ions by pH dependent SPS method.  The maximum molar absorbances were at 445 nm and 508 nm at pH 4.5 and 5.0 for Co (II) and Ni (II) ions respectively. The Beer’s law range was 5-100 μg/ml for both the metal ions. Job’s method and mole-ratio method showed that metal-ligand ratio in the complexes to be 1:1. The Molar absorptivity for Co (II) and Ni (II) were 1.351x10^-4   L mol^-1 cm^-1 and 1.925x10^-4   L mol^-1 cm^-1 respectively. The Sandell’s sensitivity was 0.005 µg/ cm² and 0.004 µg/ cm² for Co (II) and Ni (II) ions respectively. The proposed method was successfully applied to the determination of each metal ion in real samples and tap water.

Azo dye Schiff base analytical reagent; Co (II) and Ni (II) complexes; pH metric SPS

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