Denitrification in a hypersaline lake–aquifer system (Pétrola Basin, Central Spain): The role of recent organic matter and Cretaceous organic rich sediments

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dc.contributor.authorGómez Alday, J.J.
dc.contributor.authorCarrey, R.
dc.contributor.authorValiente, Nicolás
dc.contributor.authorOtero, Neus
dc.contributor.authorSoler, A.
dc.contributor.authorAyora, C.
dc.contributor.authorSanz Bas, David
dc.contributor.authorMuñoz Martín, Alfonso
dc.contributor.authorCastaño, S.
dc.contributor.authorRecio, C.
dc.contributor.authorCarnicero, A.
dc.contributor.authorCortijo, A.
dc.date.accessioned2023-06-19T13:54:51Z
dc.date.available2023-06-19T13:54:51Z
dc.date.issued2014
dc.description.abstractAgricultural regions in semi-arid to arid climates with associated saline wetlands are one of the most vulnerable environments to nitrate pollution. The Pétrola Basin was declared vulnerable to NO3 − pollution by the Regional Government in 1998, and the hypersaline lake was classified as a heavily modified body of water. The study assessed groundwater NO3 − through the use of multi-isotopic tracers (δ15N, δ34S, δ13C, δ18O) coupled to hydrochemistry in the aquifer connected to the eutrophic lake. Hydrogeologically, the basin shows two main flow components: regional groundwater flow from recharge areas (Zone 1) to the lake (Zone 2), and a density-driven flow from surface water to the underlying aquifer (Zone 3). In Zones 1 and 2, δ15NNO3 and δ18ONO3 suggest that NO3 − from slightly volatilized ammonium synthetic fertilizers is only partially denitrified. The natural attenuation of NO3 − can occur by heterotrophic reactions. However, autotrophic reactions cannot be ruled out. In Zone 3, the freshwater–saltwater interface (down to 12–16 m below the ground surface) is a reactive zone for NO3 − attenuation. Tritium data suggest that the absence of NO3 − in the deepest zones of the aquifer under the lake can be attributed to a regional groundwater flow with long residence time. In hypersaline lakes the geometry of the density-driven flow can play an important role in the transport of chemical species that can be related to denitrification processes.
dc.description.departmentDepto. de Geodinámica, Estratigrafía y Paleontología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipCastilla–La Mancha Government
dc.description.sponsorshipSpanish Government
dc.description.sponsorshipCatalan Government
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/78556
dc.identifier.doi10.1016/j.scitotenv.2014.07.129
dc.identifier.issn0048-9697, ESSN: 1879-1026
dc.identifier.officialurlhttp://dx.doi.org/10.1016/j.scitotenv.2014.07.129
dc.identifier.urihttps://hdl.handle.net/20.500.14352/34607
dc.journal.titleScience of the total environment
dc.language.isoeng
dc.page.final606
dc.page.initial594
dc.publisherElsevier
dc.relation.projectIDPEIC11-0135-8842
dc.relation.projectIDCICYT-CGL2011-29975-C04-01
dc.relation.projectIDCICYT-CGL2011-29975-C04-02
dc.relation.projectID2014 SGR 1456
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España
dc.rights.accessRightsopen access
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.cdu550.4(234.1)
dc.subject.keywordHypersaline lake
dc.subject.keywordFreshwater–saltwater interfacem
dc.subject.keywordStable isotopes
dc.subject.keywordNitrification
dc.subject.keywordDenitrification
dc.subject.ucmGeodinámica
dc.subject.ucmGeoquímica
dc.subject.unesco2507 Geofísica
dc.subject.unesco2503 Geoquímica
dc.titleDenitrification in a hypersaline lake–aquifer system (Pétrola Basin, Central Spain): The role of recent organic matter and Cretaceous organic rich sediments
dc.typejournal article
dc.volume.number497-8
dspace.entity.typePublication
relation.isAuthorOfPublication70f369a3-b3cd-43cb-874e-a7888da25de1
relation.isAuthorOfPublication.latestForDiscovery70f369a3-b3cd-43cb-874e-a7888da25de1
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