Abstract
The colloidal properties of Pu (IV) in solutions suitable for injection have been investigated as a function of pH, time after pH adjustment, and relative concentrations of Pu and complexing citrate ions. Polymerizations is increased with increasing pH and depressed by a large molar excess of citrate. The rate of depolymerization is directly proportional to citrate concentration, time and acidity.FDifferences in the rates of polymerization and depolymerization are demonstrated. The polydisperse nature of Pu (IV) colloids is shown by kinetic dialysis studies which demonstrate a mixture of diffusible species. Apparent discrepancies between values for the fraction of diffusible Pu obtained by ultrafiltration and by dialysis are related to reversible polymerization. Techniques are described for the preparation of Pu-citrate solutions of minimal colloidal and for rapid estimation of colloidal formation by the ultrafiltration procedure. The relation between the colloidal properties of Pu and its distribution in animal tissues is discussed.
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