Computer Science
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..433c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 2, pp.433-440
Computer Science
14
Scientific paper
Adsorption, desorption, and isotopic exchange experiments have been used to investigate the kinetics and reversibility of cesium sorption on illite. Trace concentrations of cesium were used and experimental conditions were kept close to those of many freshwater environments. Initial adsorption of cesium on illite was rapid but was followed by slower uptake processes with time scales of weeks to months. The uptake proceeded faster and reached much higher K d values in a Ca 2+ environment than in a K + environment. The apparent reversibility of sorption was affected by both the slow sorption processes and the nature of the competing cation. The desorption equilibration patterns indicate that cesium is released from rapidly accessible sorption sites but that the slow forward reaction continues. On time scales relevant for modelling its transport and retention in aquatic systems, cesium shows partially irreversible behaviour. A mechanistic interpretation for the observed sorption and isotopic exchange behaviour is proposed whereby cesium migrates slowly to energetically favourable interlayer sites from which it is not easily released.
Comans Rob N. J.
de Preter Peter
Haller Manuela
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