Naslov
Kinetics of iron(III) hydrolysis and precipitation in aqueous glycine solutions assessed by voltammetry

Autori
Cuculić, Vlado ; Pižeta, Ivanka

Izvornik
Collection of Czechoslovak chemical communications (0010-0765) 74 (2009), 10; 1531-1542

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Iron(III); Kinetics; Hydrolysis; Precipitation; Rate constants; Glycine; Voltammetry; Electrochemistry

Sažetak
The kinetics of iron(III) hydrolysis and precipitation in aqueous glycine solutions were studied by cathodic voltammetry with a mercury drop electrode. The kinetics was controlled by changing ionic strength (I), pH and glycine concentration. Voltammetric measurements clearly showed formation and dissociation of a soluble Fe(III)–glycine complex, formation of iron(III) hydroxide and its precipitation. The rate constants of iron(III) hydroxide precipitation were assessed. The precipitation is first-order with respect to dissolved inorganic iron(III). The calculated rate constants of iron(III) precipitation varied from 0.18 × 10–5 s–1 (at 0.2 M total glycine, pH 7.30, I = 0.6 mol dm–3) to 2.22 × 10–3 s–1 (at 0.1 M total glycine, pH 7.30, I = 0.2 mol dm–3). At 0.5 M total glycine and I = 0.6 mol dm–3, the iron(III) precipitation was not observed.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija

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