SIMULTANEOUS 1ST-DERIVATIVE SPECTROPHOTOMETRIC DETERMINATION OF NICKEL AND MANGANESE COMPLEXES WITH 2-(2-PYRIDYLMETHYLENEAMINO)PHENOL

A method is proposed for the simultaneous determination of nickel and manganese by first-derivative spectrophotometry based on their reactio ns with 2-(2-pyridylmethyleneamino)phenol (PMAP) Schiff base. The meth od allows the determination df Ni and Mn in the concentration range 0. 3 - 3.0 mug ml-1 in mixtures with their ten-fold concentration ratio. The method has been applied for Ni and Mn determination in bronzes. To optimize the experimental conditions for spectrophotometric determina tion of Mn with PMAP stability constants at different pH values have b een determined. A critical evaluation of the proposed method was perfo rmed by statistical analysis of the experimental data.