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Development of Method for Extractive Spectrophotometric Determination of Cu (II) with of Hydrazine Carboxamide-2-[(2-Hydroxy-1-Naphthalenyl) Methylene] as an Analytical Reagent

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

A spectrophotometric method has been developed for the determination of Cu (II) using Hydrazine Carboxamide-2-[(2-Hydroxy-1-Naphthalenyl) Methylene] as an extractive r eagent. 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 a range from 1 to 10 ppm. The Molar absorptivity and Sandell’s sensitivity calculated were 0.1589 x 10 4 Lmol –1 cm –1 and 0.1567 μ g/cm –2 respectively. The proposed method is very sensitive and selective. The method has been successfu lly applied to synthetic and commercial samples.