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S. N. Kalmykov, Gregory R. Choppin

Mixed Ca²⁺/UO₂²⁺/CO₃^2- complex formation at different ionic strengths

Fluorescence spectroscopy was used to study the Ca²⁺/UO₂²⁺/CO₃^2- 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.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 09/2000
Pages: 603

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