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Pregled bibliografske jedinice broj: 186936

Časopis

Autori: Cuculić, Vlado; Pižeta, Ivanka; Branica, Marko
Naslov: Voltammetric determination of stability constants of iron(III) - glycine complexes in water solution
Izvornik: Journal of electroanalytical chemistry (1572-6657) 583 (2005), 1; 140-147
Vrsta rada: članak
Ključne riječi: iron(III)-glycine complexes; stability constants; voltammetry; water solution
Sažetak:
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.
Projekt / tema: 0098121
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Geologija,Kemija
Puni text rada: 186936.CuculicSubmit.pdf
URL Internet adrese: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TGB-4GJK8KT-1-J&_cdi=5250&_user=3875467&_orig=search&_coverDate=09%2F01%2F2005&_sk=994169998&view=c&wchp=dGLbVlz-zSkzV&md5=4fd9333a41e3828713
URL cjelovitog teksta:
Google Scholar: Voltammetric determination of stability constants of iron(III) - glycine complexes in water solution



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