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Voltammetric determination of stability constants of iron(III) - glycine complexes in water solution (CROSBI ID 111977)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Cuculić, Vlado ; Pižeta, Ivanka ; Branica, Marko Voltammetric determination of stability constants of iron(III) - glycine complexes in water solution // Journal of electroanalytical chemistry (1992), 583 (2005), 1; 140-147-x

Podaci o odgovornosti

Cuculić, Vlado ; Pižeta, Ivanka ; Branica, Marko

engleski

Voltammetric determination of stability constants of iron(III) - glycine complexes in water solution

Determination of the stability constants of dissolved iron(III) - glycine system in water solution (I = 0.6 mol L-1 in NaClO4, pH = 7.3 at 25+-1 oC) using differential pulse cathodic voltammetry (DPCV) and cyclic voltammetry (CV) was performed out on a static mercury drop electrode (SMDE). By choosing voltammetry as analytical tool, measurements with lower iron(III) concentrations (10-5 mol L-1), at the pH = 7.3 were enabled, which ensured the formation of higher coordination (1 : 2 and 1 : 3) complexes of iron(III) - glycine system. The added concentration of iron(III) ions was 2.5×10-5 mol L-1 and the concentrations of total glycine varied from 0.1 to 0.5 mol L-1. Since iron(III) reduction in glycine system, with the techniques employed, was found to be one-electron reversible process, it was concluded that this system contained labile iron(III) complexes. Thus, it was possible to determine stability constants. The stability constants of [Fe(Gly)2]+ and Fe(Gly)3 complexes, which had not been reported in the literature so far, were found to be log beta(23) = 17.21+-0.03 and log beta(33) = 20.19+-0.02, respectively. According to the constants found, chemical distribution of iron(III) in glycine water solution, as a function of pH, was calculated and proposed.

iron(III)-glycine complexes; stability constants; voltammetry; water solution

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Podaci o izdanju

583 (1)

2005.

140-147-x

objavljeno

1572-6657

Povezanost rada

Geologija, Kemija

Indeksiranost