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Isonitroso-p-Methoxyacetophenone as an Analytical Reagent for Extractive Spectrophotometric Determination of a Biologically and Industrially Important Cobalt (II) Metal

B. R. Daruwala and R. M. Patil

Oximes are found to be good chelating agents and are used as analytical reagents for spectrophotometric determination of metal ions. In this work, isonitroso-p-methoxyacetophenone (HINMAP) is used as an analytical reagent for the extractive spectrophotometric determination of cobalt (II). The optimum extraction conditions are evaluated by studying parameters like pH, equilibration time, organic solvent, reagent concentration and stability of complex etc. The reagent gives a golden yellow coloured complex with Co (II) and quantitatively extracted into carbon tetrachloride at pH 9.2. The absorption spectrum of Co-HINMAP shows maxima at 400 nm and it obeys Beer’s law in the range of 1 to 12 ppm. The molar absorptivity and Sandell’s sensitivity were 1.014 x 104 L mol-1 cm-1 and 0.0023µg mL-1 cm-2, respectively. The composition of Co (II)-HINMAP is determined by Job’s continuous variation method and further confirmed by mole ratio method. The standard deviation and variation from mean at 95% confidence limit were 0.48 and ± 0.34, respectively. The effects of diverse ions have been studied. The proposed method is rapid, sensitive and precise and has been applied for the determination of cobalt in synthetic and real, industrial and pharmaceuticals samples.