ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Complexing properties of bivalent and trivalent iron in the system citric acid-iron(II) perchlorate-iron(III) perchlorate-water

M. Mamczák and V. V Paľchevskii

Department of Physical Chemistry, Faculty of Natural Sciences, P. J. Šafárik University, 041 67 Košice

Abstract:  The system Fe(III)—Fe(II)—aqueous solution of citric acid was investigated at ionic strength I=3 mol dm^-3 in the presence of Perchlorate and sodium ions by the method of redox potential. The composition of predominating complex­es was determined by graphical analysis. The stability constants were calculated as parameters of redox potential by means of a computer by using the method of least squares. The method of statistical optimization was used for solving the intricate nonlinear functional relationship. The conditions of origination and existence of individual complexes have been characterized by distribution curves. Thus, it has been shown that the complexes of trivalent iron of the composition FeAH₂^-, FeA₂H₄^-, and FeA₃H₈^- as well as complexes of bivalent iron of the composition Fe AH^- and FeAH₂ exist in the investigated system.

Full paper in Portable Document Format: 363a333.pdf

Chemical Papers 36 (3) 333–343 (1982)