Abstract
The sulphate complexes of plutonium(III) were studies at 25°C in 1 and 2 M perchloric/sulphuric acid media using the ion-exchange method of Fronaeus. Solutions were stabilised by the addition of hydroquinone and a nitrogen blanket. Studies at the two acidities indicated that no protonated ligands participate in complex formation. In the range 0·1–0·8 M HSO 4 −, only two complexes, Pu(SO 4) + and Pu(SO 4) 2 −, formed. The stability constants for the complex equilibrium Pu 3− + n HSO 4 −⇄ Pu(SO 4) n 3−2n+n H + in an acid perchlorate medium of ionic strength I = 2, are β 1 ∗ = 3·74 ± 0·2 and β 2 ∗ = 13·66 ± 0·64 . comparision of these results with the only available literature values showed large discrepancies and the reason for this is discussed.
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