Arsenite sorption and co-precipitation with calcite

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dc.creatorRoman-Ross, Gabriela
dc.creatorCuello, Gabriel
dc.creatorTurrillas, Xavier
dc.creatorFernandez-Martinez, Alejandro
dc.creatorCharlet, Laurent
dc.date2008-01-11
dc.date.accessioned2026-07-07T08:53:48Z
dc.date.available2026-07-07T08:53:48Z
dc.descriptionSorption of As(III) by calcite was investigated as a function of As(III) concentration, time and pH. The sorption isotherm, i.e. the log As(III) vs. log [As(OH)3 degrees / Assat] plot is S-shaped and has been modelled on an extended version of the surface precipitation model. At low concentrations, As(OH)3 degrees is adsorbed by complexation to surface Ca surface sites, as previously described by the X-ray standing wave technique. The inflexion point of the isotherm, where As(OH)3 degrees is limited by the amount of surface sites (ST), yields 6 sites nm-2 in good agreement with crystallographic data. Beyond this value, the amount of sorbed arsenic increases linearly with solution concentration, up to the saturation of arsenic with respect to the precipitation of CaHAsO3(s). The solid solutions formed in this concentration range were examined by X-ray and neutron diffraction. The doped calcite lattice parameters increase with arsenic content while c/a ratio remains constant. Our results made on bulk calcite on the atomic displacement of As atoms along [0001] direction extend those published by Cheng et al., (1999) on calcite surface. This study provides a molecular-level explanation for why As(III) is trapped by calcite in industrial treatments.
dc.description9 pages
dc.identifierhttps://arxiv.org/abs/0801.1738
dc.identifierhttp://arxiv.org/abs/0801.1738
dc.identifierChemical Geology 233, 3-4 (2006) 328-336
dc.identifierdoi:10.1016/j.chemgeo.2006.04.007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/145749
dc.subjectChemical Physics
dc.subjectGeophysics
dc.titleArsenite sorption and co-precipitation with calcite
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