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Use of Hydrazine Carboxamide-2-[(2-Hydroxy-1-Naphthalenyl) Methylene] as an Analytical Reagent for the Extractive Spectrophotometric Determination of Nickel (II)

R. S. Lokhande and Ratnamala P. Sonawane

The hydrazine carboxamide-2-[(2-hydroxy-1-naphthalenyl) methylene] is used as a reagent for extraction and spectrophotometric determination of Nickel (II). Nickel forms dark yellow colored complex, which can be quantitatively extracted in n-Butanol as solvent at pH 6.2. Beer’s law is obeyed in the range 3-50 μg giving a linear and reproducible graph under optimum conditions. The λmax is observed to be 395 nm. The complex obtained is studied by Job’s continuos variation method, mole ratio method and log-log method. The effect of pH as function of extraction, effect of solvents, effects of salting out agents, effect of reagent concentrations and interference study of foreign ions has been also studied. The molar absorptivity is found to be 0.4785 x 105 L mol-1 cm-1 and Sandell sensitivity is observed to be 0.0585 μg/cm2. The method developed is successfully applied to various commercial samples.