Environmental mobility of cobalt-influence of solid phase characteristics and groundwater chemistry.

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dc.contributor.authorPayne, TEen_AU
dc.contributor.authorItakura, Ten_AU
dc.contributor.authorComarmond, MJen_AU
dc.contributor.authorHarrison, JJen_AU
dc.date.accessioned2009-11-16T01:21:43Zen_AU
dc.date.accessioned2010-04-30T04:57:41Zen_AU
dc.date.available2009-11-16T01:21:43Zen_AU
dc.date.available2010-04-30T04:57:41Zen_AU
dc.date.issued2008-05en_AU
dc.date.statistics2008-05en_AU
dc.description.abstractThe adsorption of cobalt on samples from a potential waste repository site in an arid region was investigated in batch experiments, as a function of various solution phase parameters including the pH and ionic strength. The samples were characterized using a range of techniques, including BET surface area measurements, total clay content and quantitative X-ray diffraction. The statistical relationships between the measured cobalt distribution coefficients (Kd values) and the solid and liquid phase characteristics were assessed. The sorption of cobalt increased with the pH of the aqueous phase. In experiments with a fixed pH value, the measured Kd values were strongly correlated to the BET surface area, but not to the amount of individual clay minerals (illite, kaolinite or smectite). A further set of sorption experiments was undertaken with two samples of distinctive mineralogy and surface area, and consequently different sorption properties. A simple surface complexation model (SCM) that conceptualized the surface sites as having equivalent sorption properties to amorphous Fe-oxide was moderately successful in explaining the pH dependence of the sorption data on these samples. Two different methods of quantifying the input parameters for the SCM were assessed. While a full SCM for cobalt sorption on these complex environmental substrates is not yet possible, the basic applicability and predictive capability of this type of modeling is demonstrated. A principal requirement to further develop the modeling approach is adequate models for cobalt sorption on component mineral phases of complex environmental sorbents. © 2009, Elsevier Ltd.en_AU
dc.description.sponsorshipMinistry of Science and Technology of Korean Government; Korea Radioisotope Associationen_AU
dc.identifier.citationPayne, T. E., Itakura, T., Comarmond, M. J., & Harrison, J. J. (2008). Environmental mobility of cobalt-influenceof solid phase characteristics and groundwater chemistry. Paper presented to the 6th International Conference on Isotopes (6ICI), 12th - 16th May 2008. Sheraton Grande Walkerhill Hotel: Seoul, South Korea. In K. B.Park (Ed), Applied Radiation and Isotopes, 67(7-8), 1269-1276. doi:10.1016/j.apradiso.2009.02.026en_AU
dc.identifier.conferenceenddate16 May 2008en_AU
dc.identifier.conferencename6th International Conference on Isotopes (6ICI)en_AU
dc.identifier.conferenceplaceSeoul, South Koreaen_AU
dc.identifier.conferencestartdate12 May 2008en_AU
dc.identifier.editorsK. B.Parken_AU
dc.identifier.govdoc1070en_AU
dc.identifier.issue7-8en_AU
dc.identifier.journaltitleApplied Radiation and Isotopesen_AU
dc.identifier.pagination1269-1276en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2290en_AU
dc.identifier.urihttps://doi.org/10.1016/j.apradiso.2009.02.026en_AU
dc.identifier.volume67en_AU
dc.language.isoenen_AU
dc.publisherElsevier Ltden_AU
dc.subjectCobalten_AU
dc.subjectGround wateren_AU
dc.subjectMobilityen_AU
dc.subjectChemistryen_AU
dc.subjectPhase studiesen_AU
dc.subjectEnvironmental impactsen_AU
dc.titleEnvironmental mobility of cobalt-influence of solid phase characteristics and groundwater chemistry.en_AU
dc.typeConference Paperen_AU
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