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Fluorescence spectroscopy was used to study the Ca2+/UO22+/CO32- solution system at different ionic strengths. Fluorescent titrations confirmed formation of Ca2UO2(CO3)3 complex for which the values of log β213 were measured at 0.1, 0.3, 0.7, 1.0 and 3.0 m (NaClO4) at pcH = 8.1. Specific Interaction Theory (SIT) was used to correlate the log β213 values as a function of ionic strength. The value obtained for log β0213 (I = 0) was 29.8 ± 0.7, indicating that Ca2UO2(CO3)3 was the predominant specie at the pH 8 in calcium rich, oxic waters.
Published Online: 2009-9-25
Published in Print: 2000-9-1
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