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Spectrophotometric Investigation of 2-(2-Pyridylmethyleneamino) phenol Complexes with Cobalt(ll) and Nickel(ll) in Methanol—Water Solutions

Z. Grabarić, B.S. Grabarić, N. Koprivanac, and I. Eškinja

Faculty of Chemical Engineering and Technology, University of Zagreb, 41000 Zagreb, Croatia

 

Abstract: The stability constants of Co(II) and Ni(II) complexes with 2-(2-pyridylmethyleneamino)phenol (PMAP) have been determined by three methods at constant temperature  θ  = (25 +/- 1)°C, ionic strength l = 0.5 mol dm-3 (NaNO3), in methanol-water medium of volume fraction phi(methanol) = 10 %, and at different pH in order to optimize the experimental conditions for using PMAP as a spectrophotometric reagent for Co and Ni determination in beryllium bronzes. PMAP has the main advantages over other reagents due to the fact that it does not form complexes with Be and that the interferences of Zr can be avoided by pH adjustment. The influence of the interferences present in Be and Zr bronzes has also been investigated.

Full paper in Portable Document Format: 475a282.pdf

 

Chemical Papers 47 (5) 282–287 (1993)

Monday, July 06, 2020

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