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The solubility of ThO 2 ·  x  H 2 O(am) is studied at  I =0.1−4.0 M (NaHCO 3 -Na 2 CO 3 -NaCl) and 22 °C. Several sets of closed system experiments are performed at total carbonate concentrations of  C  tot =[HCO 3  - ]+[CO 3  2- ]=0.02 and 0.1 M in the range pH c  = 8−11. In our recent study at  I =0.5 M, the simultaneous evaluation of solubility data at widely varied pH c  and carbonate concentrations has shown that Th(OH)(CO 3 ) 4  5- , Th(OH) 2 (CO 3 ) 2  2-  and Th(OH) 4 (CO 3 ) 2-  are the most important ternary complexes. The present results at  I =0.1−4.0 M are used to describe the ionic strength dependence of the equilibrium constants log K  s, 1 yz   (for the reactions Th(OH) 4 (am)+ z CO 3  2- ↔Th(OH)  y  (CO 3 )  z   4- y -2 z  +(4- y )OH - ) with the SIT. EXAFS measurements in 0.1 and 1.0 M carbonate solutions support the calculated speciation. They show clearly different spectra for the predominant species Th(OH)(CO 3 ) 4  5-  and Th(CO 3 ) 5  6- , respectively.

radiochimica acta

Solubility of ThO 2 · x H 2 O(am) and the formation of ternary Th(IV) hydroxide-carbonate complexes in NaHCO 3 -Na 2 CO 3  solutions containing 0−4 M NaCl