Competitive Adsorption of Arsenite and Silicic Acid on Goethite

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dc.contributor.authorLuxton, Todd Peteren
dc.contributor.committeechairEick, Matthew J.en
dc.contributor.committeememberZelazny, Lucian W.en
dc.contributor.committeememberTadanier, Christopher J.en
dc.contributor.committeememberDaniels, W. Leeen
dc.contributor.departmentCrop and Soil Environmental Sciencesen
dc.date.accessioned2014-03-14T20:50:54Zen
dc.date.adate2003-01-10en
dc.date.available2014-03-14T20:50:54Zen
dc.date.issued2002-12-12en
dc.date.rdate2004-01-10en
dc.date.sdate2002-12-30en
dc.description.abstractThe adsorption behavior of silicic acid and arsenite alone and competitively on goethite over a broad pH range (3-11) at environmentally relevant concentrations was investigated utilizing pH adsorption data and zeta potential measurements. Both addition scenarios (Si before As(III) and As(III) before Si) were examined. The results of the adsorption experiments and zeta potential measurements were then used to model the single ion and competitive ion adsorption on goethite with the CD-MUSIC model implemented in the FITEQL 4.0 computer program. Silicic acid adsorption was reduced by the presence of arsenite for all but one of the adsorption scenarios examined, while in contrast silicic acid had little effect upon arsenite adsorption. However, the presence of silicic acid, regardless of the addition scenario, dramatically increased the arsenite equilibrium solution concentration over the entire pH range investigated. The CD-MUSIC model was able to predict the single ion adsorption behavior of silicic acid and arsenite on goethite. The modeled zeta potential data provided further evidence of the CD-MUSIC model's ability to describe the single anion adsorption on goethite. Our model was also able to collectively describe adsorption and zeta potential data for the low Si-arsenite adsorption scenario quite well however, our model under-predicted silicic acid adsorption for the high Si-arsenite competitive scenario.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-12302002-002411en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12302002-002411/en
dc.identifier.urihttp://hdl.handle.net/10919/36486en
dc.publisherVirginia Techen
dc.relation.haspartThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsurface complexation modelingen
dc.subjectarsenicen
dc.subjectsilicic aciden
dc.subjectCD-MUSIC modelen
dc.subjectcompetitive adsorptionen
dc.subjectFe-hydroxideen
dc.subjectsilicaen
dc.subjectarseniteen
dc.subjectgoethiteen
dc.titleCompetitive Adsorption of Arsenite and Silicic Acid on Goethiteen
dc.typeThesisen
thesis.degree.disciplineCrop and Soil Environmental Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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