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dc.contributor.author
Puccia, Virginia
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dc.contributor.author
Limbozzi, Fabiana
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dc.contributor.author
Avena, Marcelo Javier
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dc.date.available
2016-09-09T17:42:14Z
dc.date.issued
2015-06
dc.identifier.citation
Puccia, Virginia; Limbozzi, Fabiana; Avena, Marcelo Javier; Arsenic in porewaters of the unsaturated zone of an Argentinean watershed: Adsorption and competition with carbonate as important processes that regulate its concentration; Springer; Aquatic Geochemistry; 21; 6; 6-2015; 513-534
dc.identifier.issn
1380-6165
dc.identifier.uri
http://hdl.handle.net/11336/7582
dc.description.abstract
The arsenic (As) concentration in porewaters of the unsaturated (vadose) zone of a watershed located in the Chaco-Pampean Plain of Argentina was investigated. A water displacement method using carbon tetrachloride was applied to the sediments in order to obtain the water samples, which could not be obtained by a simple high-speed centrifugation method. The CD-MUSIC surface complexation model was applied to calculate arsenate adsorption on sediments, arsenate concentration in porewaters in contact with the sediments and effects of carbonate. Ferrihydrite was considered to represent the active adsorbing material in the sediments. Therefore, proton adsorption (surface charge) data and arsenate adsorption isotherms obtained with a synthetic ferrihydrite were used to calibrate the CD-MUSIC model. Arsenate and carbonate concentrations in the studied porewaters were positively correlated. The model was able to predict As concentration within a factor of two in most samples. Carbonate affects As concentration by competing with arsenate species for adsorption sites on the mineral surface. As it occurs with groundwater samples of the saturated zone in many aquifers, this article shows for the first time that adsorption-desorption processes also seem to control As concentration in oxic porewaters of the unsaturated zone.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Arsenate
dc.subject
Aquifer
dc.subject
Complexation
dc.subject
Porewaters
dc.subject.classification
Geoquímica y Geofísica
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Arsenic in porewaters of the unsaturated zone of an Argentinean watershed: Adsorption and competition with carbonate as important processes that regulate its concentration
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-02-29T13:26:06Z
dc.journal.volume
21
dc.journal.number
6
dc.journal.pagination
513-534
dc.journal.pais
Alemania
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dc.journal.ciudad
Berlín
dc.description.fil
Fil: Puccia, Virginia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto de Química del Sur; Argentina
dc.description.fil
Fil: Limbozzi, Fabiana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida(i); Argentina
dc.description.fil
Fil: Avena, Marcelo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto de Química del Sur; Argentina
dc.journal.title
Aquatic Geochemistry
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://link.springer.com/article/10.1007/s10498-015-9271-1
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1007/s10498-015-9271-1
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