Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach

Sulfur (S) plays a significant role in saline environments, and sulfate (SO42 -) is an important component of the biogeochemical S-cycle since it acts as the main electron acceptor in anoxic sediments. The purpose of this paper is to evaluate the fate of S, its origin, and processes affecting sulfat...

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Autores: Valiente Parra, Nicolás, Carrey, R., Otero, N., Gutiérrez Villanueva, Miguel Ángel, Soler Gil, Albert, Sanz Martínez, David, Castaño Fernández, Santiago, Gómez Alday, Juan José
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/32890
Acceso en línea:http://dx.doi.org/10.1016/j.chemgeo.2017.10.024
https://hdl.handle.net/10578/32890
Access Level:acceso abierto
Palabra clave:Bacterial sulfate reduction
Density-driven flow
Hypersaline lake
Stable isotopes
Sulfur recycling
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spelling Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approachValiente Parra, NicolásCarrey, R.Otero, N.Gutiérrez Villanueva, Miguel ÁngelSoler Gil, AlbertSanz Martínez, DavidCastaño Fernández, SantiagoGómez Alday, Juan JoséBacterial sulfate reductionDensity-driven flowHypersaline lakeStable isotopesSulfur recyclingSulfur (S) plays a significant role in saline environments, and sulfate (SO42 -) is an important component of the biogeochemical S-cycle since it acts as the main electron acceptor in anoxic sediments. The purpose of this paper is to evaluate the fate of S, its origin, and processes affecting sulfate outcome in the hypersaline Pétrola Lake in the Castilla-La Mancha region (High Segura Basin, SE Spain). The lake is the terminal discharge zone of an endorheic basin with considerable anthropogenic pressures. Anthropogenic activities (mainly agricultural inputs and wastewater discharge), together with bedrock leaching of sulfate and sulfide-rich sediments, increase dissolved SO42 - in surface and groundwater up to 123,000 mg/L. The source and fate of sulfate in this environment was investigated coupling hydrochemistry, including hydrogen sulfide (H2S) microprofiles, isotopic analyses (d34S, d18OSO4, d2HH2O, d18OH2O, and tritium), mineralogical determinations, and molecular biology tools (16S rDNA amplification and sequencing). The origin of dissolved SO42 - in water is related to pyrite oxidation from Lower Cretaceous sediments, and secondary gypsum dissolution. Under the lake, dissolved SO42 - decreases with depth, controlled by three main processes: (1) seasonal evaporation cycles, (2) hydrodynamic instability caused by the different density-driven groundwater flow, and (3) sulfate-reduction processes, i.e. dissimilatory bacterial sulfate reduction (BSR). These processes control the continuous recycling of sulfur in the system. Lake water and groundwater are in hydraulic connection, and a density-driven flow (DDF) is able to transport reactive organic matter and dissolved SO42 - towards the underlying aquifer. Hydrochemical evolution in depth, H2S production (up to 0.024 nmol/cm3·s) and the presence of sulfate-reducing bacteria suggest the existence of BSR processes. However, isotope techniques are insufficient to elucidate BSR processes since their isotopic effect is masked by low isotope fractionation and high SO42 - concentrations. The pattern here described may be found in other saline basins worldwide.Elsevier202420242017info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttp://dx.doi.org/10.1016/j.chemgeo.2017.10.024https://hdl.handle.net/10578/32890reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésBES-2012-052256PEIC-2014-004-PATTENUATION (CICYT-CGL2011-29975-C04-02)REMEDIATION (CGL2014-57215-C4-1-R)2014-SGR-1456info:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/328902026-05-27T07:36:41Z
dc.title.none.fl_str_mv Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
title Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
spellingShingle Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
Valiente Parra, Nicolás
Bacterial sulfate reduction
Density-driven flow
Hypersaline lake
Stable isotopes
Sulfur recycling
title_short Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
title_full Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
title_fullStr Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
title_full_unstemmed Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
title_sort Tracing sulfate recycling in the hypersaline Pétrola Lake (SE Spain): A combined isotopic and microbiological approach
dc.creator.none.fl_str_mv Valiente Parra, Nicolás
Carrey, R.
Otero, N.
Gutiérrez Villanueva, Miguel Ángel
Soler Gil, Albert
Sanz Martínez, David
Castaño Fernández, Santiago
Gómez Alday, Juan José
author Valiente Parra, Nicolás
author_facet Valiente Parra, Nicolás
Carrey, R.
Otero, N.
Gutiérrez Villanueva, Miguel Ángel
Soler Gil, Albert
Sanz Martínez, David
Castaño Fernández, Santiago
Gómez Alday, Juan José
author_role author
author2 Carrey, R.
Otero, N.
Gutiérrez Villanueva, Miguel Ángel
Soler Gil, Albert
Sanz Martínez, David
Castaño Fernández, Santiago
Gómez Alday, Juan José
author2_role author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Bacterial sulfate reduction
Density-driven flow
Hypersaline lake
Stable isotopes
Sulfur recycling
topic Bacterial sulfate reduction
Density-driven flow
Hypersaline lake
Stable isotopes
Sulfur recycling
description Sulfur (S) plays a significant role in saline environments, and sulfate (SO42 -) is an important component of the biogeochemical S-cycle since it acts as the main electron acceptor in anoxic sediments. The purpose of this paper is to evaluate the fate of S, its origin, and processes affecting sulfate outcome in the hypersaline Pétrola Lake in the Castilla-La Mancha region (High Segura Basin, SE Spain). The lake is the terminal discharge zone of an endorheic basin with considerable anthropogenic pressures. Anthropogenic activities (mainly agricultural inputs and wastewater discharge), together with bedrock leaching of sulfate and sulfide-rich sediments, increase dissolved SO42 - in surface and groundwater up to 123,000 mg/L. The source and fate of sulfate in this environment was investigated coupling hydrochemistry, including hydrogen sulfide (H2S) microprofiles, isotopic analyses (d34S, d18OSO4, d2HH2O, d18OH2O, and tritium), mineralogical determinations, and molecular biology tools (16S rDNA amplification and sequencing). The origin of dissolved SO42 - in water is related to pyrite oxidation from Lower Cretaceous sediments, and secondary gypsum dissolution. Under the lake, dissolved SO42 - decreases with depth, controlled by three main processes: (1) seasonal evaporation cycles, (2) hydrodynamic instability caused by the different density-driven groundwater flow, and (3) sulfate-reduction processes, i.e. dissimilatory bacterial sulfate reduction (BSR). These processes control the continuous recycling of sulfur in the system. Lake water and groundwater are in hydraulic connection, and a density-driven flow (DDF) is able to transport reactive organic matter and dissolved SO42 - towards the underlying aquifer. Hydrochemical evolution in depth, H2S production (up to 0.024 nmol/cm3·s) and the presence of sulfate-reducing bacteria suggest the existence of BSR processes. However, isotope techniques are insufficient to elucidate BSR processes since their isotopic effect is masked by low isotope fractionation and high SO42 - concentrations. The pattern here described may be found in other saline basins worldwide.
publishDate 2017
dc.date.none.fl_str_mv 2017
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://dx.doi.org/10.1016/j.chemgeo.2017.10.024
https://hdl.handle.net/10578/32890
url http://dx.doi.org/10.1016/j.chemgeo.2017.10.024
https://hdl.handle.net/10578/32890
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv BES-2012-052256
PEIC-2014-004-P
ATTENUATION (CICYT-CGL2011-29975-C04-02)
REMEDIATION (CGL2014-57215-C4-1-R)
2014-SGR-1456
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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