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A Simple Spectrophotometric Method for the Determination of Nickel (II) using 1-(2-Pyridylazo)-2-Naphthol in Micellar Aqueous Solution of CTAB

Gul Afshan Soomro and Ghulam Abbas Shar

A simple rapid new spectrophotometric method has been developed for the determination of nickel at trace level using 1-(2-pyridylazo-2-naphthol (PAN) in cationic micellar solution of cetyltrimethyl ammonium bromide (CTAB). In the present method, the use of micellar system replaces the previous solvent extraction method, which reduces the cost and toxicity, while enhancing the sensitivity, selectivity and the molar absorptivity. The average molar absorption coefficient and Sandell’s sensitivity was found 1.75 × 104 Lmol-1 cm-1 and 3.4 ng cm-2 at λmax 567.6 nm. Beer’s law linear calibration graph was obtained over the concentration range 0.12-4.0 μg mL-1, the stoichiometric composition of the chelate was 1:2 (Ni: PAN). The developed method is successfully applied for the determination of nickel from alloys and real samples.