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Extraction and spectrophotometric determination of nickel in water, alloys and edible oil samples

C. Ravichandran*; D. Benzil; C. Ramachandraiah and K. B. Chandrasekhar


An extraction-spectrophotometric method has been developed for determination of nickel using N'-(2-hydroxybenzylidene)-3-(4-o-tolylpiperazin-1-yl) propanehydrazide (HTP) as the new extractant. The reagent reacts with nickel (II) at pH = 9.0 and form a 1:1 yellow color complex, which is extracted into chloroform solvent. The complex showed maximum absorption wavelength at 382 nm. Beer’s law is obeyed in the concentration range of 1.17-12.91 μg.mL-1 with apparent molar absorptivity (0.72 x 104 L mol-1 cm-1) and Sandell’s sensitivity (0.008 μg/cm2/0.001 absorbance units). The tolerance limit of various foreign ions was investigated. The developed method was successfully applied for the determination of Nickel (II) in real water samples, alloy samples and Edible oil samples.


Spectrophotometry; Nickel (II)-HTP complex and different samples

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