Published online by Cambridge University Press: 01 January 1992
Advances in safe management and disposal of radioactive waste have shown that a comprehensive program requires the incorporation of dissolved organics into radwaste and transport effluent models, with respect to their binding of radionuclides. The binding of Eu3+, Th4+ and UO22+ to a well-characterized aquatic fulvic acid has been studied using an ultrafiltration method at a bulk electrolyte concentration of 0.10 M NaClO4, trace amounts of radionuclides and fulvic acid concentrations of 60 and 120 mg/l. The results expressed as the overall complex formation function, βov, versus pH show the following order: Th4+ > Eu3+ > UO22+. The estimated βov, values have been discussed by considering the aqueous chemistry of Eu3+, Th4+ and UO22+ vis-à-vis the solution chemistry of the fulvic acid sample.