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dc.contributor.authorPutnis, Christine
dc.contributor.authorRenard, F.
dc.contributor.authorKing, H.
dc.contributor.authorMontes-Hernandez, G.
dc.contributor.authorRuiz-Agudo, E.
dc.date.accessioned2017-01-30T15:12:46Z
dc.date.available2017-01-30T15:12:46Z
dc.date.created2015-10-29T04:09:36Z
dc.date.issued2013
dc.date.submitted2015-10-29
dc.identifier.citationPutnis, C. and Renard, F. and King, H. and Montes-Hernandez, G. and Ruiz-Agudo, E. 2013. Sequestration of selenium on calcite surfaces revealed by nanoscale imaging. Environmental Science and Technology. 47 (23): pp. 13469-13476.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/44228
dc.identifier.doi10.1021/es403637u
dc.description.abstract

Calcite, a widespread natural mineral at the Earth’s surface, is well-known for its capacity to sequester various elements within its structure. Among these elements, selenium is important because of its high toxicity in natural systems and for human health. In the form of selenite (Se(IV)), selenium can be incorporated into calcite during growth. Our in situ atomic force microscopy observations of calcite surfaces during contact with selenium-bearing solutions demonstrate that another process of selenium trapping can occur under conditions in which calcite dissolves. Upon the injection of solutions containing selenium in two states of oxidation (either Se(IV) or Se(VI)), precipitates were observed forming while calcite was still dissolving. In the presence of selenate (Se(VI)), the precipitates formed remained small during the observation period. When injecting selenite (Se(IV)), the precipitates grew significantly and were identified as CaSeO3·H2O, based on SEM observations, Raman spectroscopy, and thermodynamic calculations. An interpretation is proposed where the dissolution of calcite increases the calcium concentration in a thin boundary layer in contact with the surface, allowing the precipitation of a selenium phase. This process of dissolution–precipitation provides a new mechanism for selenium sequestration and extends the range of thermodynamic conditions under which such a process is efficient.

dc.titleSequestration of selenium on calcite surfaces revealed by nanoscale imaging
dc.typeJournal Article
dcterms.dateSubmitted2015-10-29
dcterms.source.volume47
dcterms.source.number23
dcterms.source.startPage13469
dcterms.source.endPage13476
dcterms.source.issn0013-936X
dcterms.source.titleEnvironmental Science and Technology
curtin.digitool.pid232175
curtin.pubStatusPublished
curtin.refereedTRUE
curtin.departmentDepartment of Chemistry
curtin.identifier.scriptidPUB-VC-ORD-SA-02512
curtin.identifier.elementsidELEMENTS-69306
curtin.accessStatusFulltext not available


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