closed systems; singly-coordinated group »Fe-OH(e) is able to form complexes by edge sharing; combined data set of [HL85] and [MST95] is used; the OH ligand of this species may protonate resulting in »(FeOH)2UO2CO3, if included in the data description, logK = 16.6+-0.7; an alternativ ternary uranyl mono-carbonato surface species is »(FeO(c))2CO-UO2(OH)3