Abstract

S. K. Hawa, Bharat Kumar Sharma, S. P. Mathur and Saroj Sharma

The spectro photometric determination of trace nickel (II) with 1-allyl-3-{2-pyridyl) thiourea is described. A stable complex formed from nickel and 1-allyl -2-(2-pyridyl) thiourea can not be directly extracted into benzene or chloroform, but can be easily adsorbed on microcrystalline naphthalene at room temperature. This complex is very stable in naphthalene—dimethylformamide solution. The absorbance of the solution was measured at 385 nm against the reagent blank. The absorbance showed a linear relationship to the concentration of nickel in the range 5—60 μg per 10 ml of dimethylformamide. The molar absorptivity was found to be 4.98x1041. mole-4 Cm-1 at 385 nm and sensitivity being 0.0038 μg of Ni (II) for the absorbance of 0.001. The sample containing 50μg of nickel gave a mean absorbance of 0.586 with a standard deviation of 0.8x10-3

Complex; Micro; Crystalline

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