Potential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extraction

dc.contributor.authorTang, Jianwuen
dc.contributor.authorWhittecar, G. Richarden
dc.contributor.authorJohannesson, Karen H.en
dc.contributor.authorDaniels, W. Leeen
dc.contributor.departmentSchool of Plant and Environmental Sciencesen
dc.coverage.countryUnited Statesen
dc.coverage.countyCharles City Countyen
dc.coverage.stateVirginiaen
dc.date.accessed2015-04-23en
dc.date.accessioned2015-04-23T22:03:07Zen
dc.date.available2015-04-23T22:03:07Zen
dc.date.issued2004-12-07en
dc.description.abstractBackfills of dredged sediments onto a former sand and gravel mine site in Charles City County, VA may have the potential to contaminate local groundwater. To evaluate the mobility of trace elements and to identify the potential contaminants from the dredged sediments, a sequential extraction scheme was used to partition trace elements associated with the sediments from the local aquifer and the dredged sediments into five fractions: exchangeable, acidic, reducible, oxidizable, and residual phases. Sequential extractions indicate that, for most of the trace elements examined, the residual phases account for the largest proportion of the total concentrations, and their total extractable fractions are mainly from reducible and oxidizable phases. Only Cd, Pb, and Zn have an appreciable extractable proportion from the acidic phase in the filled dredged sediments. Our groundwater monitoring data suggest that the dredged sediments are mainly subject to a decrease in pH and a series of oxidation reactions, when exposed to the atmosphere. Because the trace elements released by carbonate dissolution and the oxidation (e.g., organic matter degradation, iron sulfide and, ammonia oxidation) are subsequently immobilized by sorption to iron, manganese, and aluminum oxides, no potential contaminants to local groundwater are expected by addition of the dredged sediments to this site. (C) 2004 American Institute of Physics.en
dc.description.sponsorshipWeanack Limited Land Partners, Inc.en
dc.format.extent12 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationTang, J. W., Whittecar, G. R., Johannesson, K. H. & Daniels, W. L. (2004). Potential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extraction. Geochemical Transactions, 5(4), 49-60. doi: 10.1063/1.1839111en
dc.identifier.doihttps://doi.org/10.1186/1467-4866-5-49en
dc.identifier.issn1467-4866en
dc.identifier.urihttp://hdl.handle.net/10919/51789en
dc.identifier.urlhttp://www.geochemicaltransactions.com/content/5/4/49en
dc.language.isoenen
dc.publisherAmerican Institute of Physicsen
dc.rightsCreative Commons Attribution 3.0 United Statesen
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/en
dc.subjectGroundwater contaminationen
dc.subjectSedimentationen
dc.subjectDredgingen
dc.subjectRunoffen
dc.subjectVirginiaen
dc.subjectMiningen
dc.titlePotential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extractionen
dc.title.serialGeochemical Transactionsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
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