Computer Science
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001gecoa..65.3955v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 65, Issue 21, pp.3955-3964
Computer Science
Scientific paper
Radionuclides are present in contaminated surfacial waters, but their behavior in the presence of natural organic acids is poorly known. Dissociation constants for the strontium acetate (SrCH 3 COO + ) and cesium acetate (CsCH 3 COO 0 ) ion pair were determined by potentiometry at temperatures from 25 to 175°C at the saturation pressure of water. Logarithms of measured dissociation constants (log K ) decrease with increasing temperature, showing that Sr and Cs complexing increases as temperature rises. Log K for SrCH 3 COO + decreases from -1.38 at 25°C to -2.10 at 175°C, whereas log K for CsCH 3 COO 0 decreases from 0.00 at 25°C to -0.85 at 175°C. Species distribution calculations performed by means of the experimentally determined dissociation constants in this study suggest that acetate complexes do not dominate either aqueous Sr or Cs speciation in most natural fluids; Cs acetate complexes likely never account for more than a few percent of the total Cs in solution. Although Sr-acetate complexing is more important, it may only dominate in extreme conditions.
Fournier Patricia
Harrichoury Jean-Claude
Oelkers Eric H.
Vala Ragnarsdottir Kristin
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