Abstract
Fe(III) radionuclide speciation in aqueous solutions at pH ranging from 1 to 12 and Fe(III) concentration, from 1 ×10-7 to 1 ×10-2 M was studied. At trace Fe(III) concentrations (∼1 ×10-7 M), the sorption colloids, so-called pseudocolloids, are formed within pH range 3-12. At pH within 0.7-1.5, Fe(III) exists in the form of hydrated cations Fe(H2O)63+, which are hydrolyzed at pH > 1.5 (Kh = 3.7 ×10-3) to form mononuclear Fe(OH)2+ hydroxo complexes. At Fe(III) concentration exceeding 1 ×10-4 M, Fe2(OH)5.70.3+ binuclear hydroxo complexes are formed.
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