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AbstiactThebinding of Am^^, and UOj^ to polymaleic acid, polyethylenemaleic acid and polymethylvinylethermaleic acid has been measured by a solvent extraction technique at 25°C and either 0.02 or 0.10 M ionic strength. The solutions were buffered over a pH ränge such that the percent of carboxylate groups ionized ranged from 25 to 74%. The binding was described by two constant;i, and , which were evaluated after correction for complexation of the actinide cations by acetate and hydrolysis. Fot comparable degrees of ionization, all three polyelectrolytes showed similar binding strengths. Ingeneral, these results indicated that the binding of actinides to these synthetic polyelectrolytes is basically similar to that of natural polyelectrolytes such as humic and fulvic acids.

Decay rate /Change of decay rate /' 5 Zn Summary The relative decay rate change, Δ λ/λ, of 65 Zn in its two oxidation states, Zn° and Zn 2 is determined by measuring gamma activities of a pair of samples alternately. The redox reaction of Zn is realized in a secondary battery at a certain time interval during the activity measurement. By using the so called "jumpmçthod" the Δλ/λ value for the given set of oxidation states is determined to be Δλ λ( 45 Ζη° ) -\(Ca 65 Zn(OH) 4 ) (11.5 ± 0.4) X 10-λ λ(« 5 Ζη°)The theoretical estimates made in this work corroborate approximately the experimental values.