The citrate complexes of Zn2+ and Cd2+ have been investigated by pH titration at I = 0.1 M (KNO3) and 10, 25, 35 and 45°. The species found were [Zn(cit)]−, [Zn(cit)H], [Zn(cit)2]4− and [Zn2(cit)2H−2]4−, [Cd(cit)]−, [Cd(cit)H], [Cd(cit)2]4− and [Cd(cit)H−1]2−. From the dependence of the formation constants on temperature, ΔH° and ΔS° values were calculated. Speciation in the Zn2+]- and Cd2+-citrate systems is discussed with particular attention to formation of polynuclear species. Some comparisons with literature data are made.
Formation and Stability of Zinc(II) and Cadmium(II) Citrate Complexes in Aqueous Solution at Various Temperatures
DE ROBERTIS, Alessandro;DE STEFANO, Concetta;SAMMARTANO, Silvio
1986-01-01
Abstract
The citrate complexes of Zn2+ and Cd2+ have been investigated by pH titration at I = 0.1 M (KNO3) and 10, 25, 35 and 45°. The species found were [Zn(cit)]−, [Zn(cit)H], [Zn(cit)2]4− and [Zn2(cit)2H−2]4−, [Cd(cit)]−, [Cd(cit)H], [Cd(cit)2]4− and [Cd(cit)H−1]2−. From the dependence of the formation constants on temperature, ΔH° and ΔS° values were calculated. Speciation in the Zn2+]- and Cd2+-citrate systems is discussed with particular attention to formation of polynuclear species. Some comparisons with literature data are made.File in questo prodotto:
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