A simple, sensitive and accurate spectrophotometric method has been developed for the determination of nickel (II). The reagent 2-Amino acetophenone isonicotinoyl hydrazone (2-AAINH) react with nickel (II) in aqueous solution in the pH range 3.0-11.0 and to form light yellow coloured complex. The complex shows λmax at 470 nm with a molar absorptivity 1.05 x 104 L mo1-1cm-1and Sandell’s sensitivity 0.56 x10-2 μg cm-2. Beer’s law is obeyed in the concentration range 0.29-6.16 μg mL-1 of Ni (II). A method for the determination of nickel (II) by second order derivative spectrophotometry has also been proposed. Interference of various diverse ions has been studied. The present method is applied for the determination of nickel in drinking water, aluminium based alloys, alloy steels and vegetable (groundnut) oil samples.
