Hydrolysis of the Fe³⁺ Cation
into Polynuclear Hydroxo Complexes in the Presence
of Cl, Cl, N, and S Ions in Solution

D. Yu. Davydov

Joint Institute for Energy and Nuclear Research, Minsk, Belarus

Received April 28, 2004

Abstract—The hydrolysis of the Fe³⁺ cation into polynuclear hydroxo complexes is studied in the presence of
Cl, Cl, N, and S anions. N and Cl^– anions do not exert any considerable effect on the hydrolytic
polymerization of Fe³⁺. Raising the ionic strength of the solution by introducing NaClO₄ increases the concen-
tration of polynuclear hydroxo complexes. This finding is in agreement with theory. The effect of S anions
on the hydrolysis of the Fe³⁺ cation into polynuclear hydroxo complexes is governed to a considerable extent
by the concentration of these anions: at concentrations below 10^–4 mol/l, S anions exert no effect on the
formation of polynuclear iron(III) hydroxo complexes; at S concentrations of 5 10^–4 to 1 10^–2 mol/l,
large particles that can be settled by centrifugation form in the solution; and when the concentration of S
ions is above 10^–1 mol/l, they prevent the polymerization of the hydrolyzed species Fe(OH.

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