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Development of Method for Extractive Spectrophotometric Determination of Co (II) with 2-Hydroxy-1-Naphthalene Carboxaldehyde Phenyl Hydrazone as an Analytical Reagent

Ratnamala P. Sonawane, R. S. Lokhande and Utkarsha M. Chavan

A spectrophotometric method has been developed for the determination of Co (II) using 2-hydroxy-1-naphthalene carboxaldehyde phenyl hydrazone as an extractive reagent. The reagent forms a coloured complex, which has been quantitatively extracted into n-butanol at pH 8.4. The method obeys Beer’s law over arrange from 1 to 10 ppm. The Molar absorptivity and Sandell’s sensitivity were 2.380 × 104 L mol-1cm-1 and 0.1176 μg cm-2, respectively. The proposed method is very sensitive and selective. The method has been successfully applied to synthetic and commercial samples.