title: Complexation of thorium(IV) with acetate at variable temperatures.
abstract: The complexation between Th(IV) and acetate in 1.05 mol kg(-1) NaClO4 was studied at variable temperatures (10, 25, 40, 55 and 70 degrees C). The formation constants of five successive complexes, Th(Ac)j(4-j)+ where Ac = CH3COO- and j = 1-5, and the molar enthalpies of complexation were determined by potentiometry and calorimetry. Extended X-ray absorption fine structure spectroscopy (EXAFS) provided additional information on the complexes in solution. The effect of temperature on the stability of the complexes is discussed in terms of the electrostatic model.
authors.affiliation: Glenn T. Seaborg Center, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. LRao@lbl.gov
authors.forename: Linfeng
authors.initials: L
authors.lastname: Rao
authors.forename: Zhicheng
authors.initials: Z
authors.lastname: Zhang
authors.forename: PierLuigi
authors.initials: P
authors.lastname: Zanonato
authors.forename: Plinio
authors.initials: P
authors.lastname: Di Bernardo
authors.forename: Arturo
authors.initials: A
authors.lastname: Bismondo
authors.forename: Sue B
authors.initials: SB
authors.lastname: Clark