2 – hydroxy 1- naphthaldehyde thiosemicarbazone (HNT) is synthesized in laboratory and characterized by NMR, IR and elemental analysis for its purity. This reagent forms a yellowish green coloured complex with Ni (II) which can be quantitatively extracted into ethyl acetate at pH 7. Complex in ethyl acetate shows an intense absorption peak 430 nm. It is observed that Beer’s law is obeyed in the range of 10µg to 100µg of metal solution. It gives linear and reproducible graph under appropriate conditions, the complex having a molar absorptivity of 0.275 x 10 6L mol-1 cm-1, Sandell’s sensitivity calculated was found to be 0.275 x 102 µg cm-2 .Nature of the extracted complex, determined by Job’s continuous variation method, Slope ratio method and Mole ratio method shows that the composition of Ni (II): HNT is 1:1. Interference by various ions is studied and masking agents used where required. The proposed method has been applied for the determination of Ni (II) in various samples. The results of the analysis are found to be comparable with those obtained by standard method.
Nickel (II); solvent extraction-spectrophotometric determination; 2 – hydroxy 1- naphthaldehyde thiosemicarbazone (HNT)
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