Study of thorium and cerium carbonate complexes. Determination of the stability constants of pentacarbonatothorate (IV) and dicarbonatocerate(IV) Ions, at pH 8.8.

Acacio Joao, Hugh Burrows, Lubomir Zikovsky, Maija Lipponen

Research output: Contribution to journalArticleScientificpeer-review


A solvent extraction method, followed by neutron activation analysis of Th(IV) and Ce(IV) enabled the study of complexation equilibria and the determination of the stability constants (βc5) and (βc2) of the pentacarbonatothorate(IV) and dicarbonatocerate(IV) ions at pH 8.8. The values obtained at various ionic strengths (I) were log βc5 = 22.0 ± 0.2 (I 0.025 M), 21.6 ± 0.2 (I 0.050 M), 21.4 ± 0.2 (I 0.700 M) for the thorium complex, and log βc2 = 10.1 ± 0.2 (I 0.025 M), 10.8 ± 0.2 (I 0.050 M), 12.3 ± 0.2 (I 0.700 M) for the cerium complex. (orig.)
Original languageEnglish
Pages (from-to)177-183
JournalRadiochimica Acta
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed


Cite this