Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems

8 pages, 4 figures

Detalles Bibliográficos
Autores: Gascón Díez, Elena, Loizeau, Jean-Luc, Cosio, Claudia, Bouchet, Sylvain, Adatte, Thierry, Amouroux, David, Bravo, Andrea G.
Tipo de recurso: artículo
Estado:Versión enviada para evaluación y publicación
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::8a7345766f7c003ba4420278d55bf0de
Acceso en línea:http://hdl.handle.net/10261/376069
Access Level:acceso abierto
Palabra clave:Methylmecury
Mercury methylation
Oxic water column
Sediments
Settling particles
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spelling Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater SystemsGascón Díez, ElenaLoizeau, Jean-LucCosio, ClaudiaBouchet, SylvainAdatte, ThierryAmouroux, DavidBravo, Andrea G.MethylmecuryMercury methylationOxic water columnSedimentsSettling particles8 pages, 4 figuresAs the methylation of inorganic mercury to neurotoxic methylmercury has been attributed to the activity of anaerobic bacteria, the formation of methylmercury in the oxic water column of marine ecosystems has puzzled scientists over the past years. Here we show for the first time that methylmercury can be produced in particles sinking through oxygenated water column of lakes. Total mercury and methylmercury concentrations were measured in the settling particles and in surface sediments of the largest freshwater lake in Western Europe (Lake Geneva). While total mercury concentration differences between sediments and settling particles were not significant, methylmercury concentrations were about ten-fold greater in settling particles. Methylmercury demethylation rate constants (kd) were of similar magnitude in both compartments. In contrast, mercury methylation rate constants (km) were one order of magnitude greater in settling particles. The net potential for methylmercury formation, assessed by the ratio between the two rate constants (kmkd–1), was therefore up to ten fold greater in settling particles, denoting that in situ transformations likely contributed to the high methylmercury concentration found in settling particles. Mercury methylation was inhibited (∼80%) in settling particles amended with molybdate, demonstrating the prominent role of biological sulfate-reduction in the processPeer reviewedAmerican Chemical Society202520252016info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Preprintinfo:eu-repo/semantics/submittedVersionhttp://hdl.handle.net/10261/376069reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1021/acs.est.6b03260Noinfo:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::8a7345766f7c003ba4420278d55bf0de2026-05-22T06:33:51Z
dc.title.none.fl_str_mv Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
title Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
spellingShingle Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
Gascón Díez, Elena
Methylmecury
Mercury methylation
Oxic water column
Sediments
Settling particles
title_short Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
title_full Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
title_fullStr Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
title_full_unstemmed Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
title_sort Role of Settling Particles on Mercury Methylation in the Oxic Water Column of Freshwater Systems
dc.creator.none.fl_str_mv Gascón Díez, Elena
Loizeau, Jean-Luc
Cosio, Claudia
Bouchet, Sylvain
Adatte, Thierry
Amouroux, David
Bravo, Andrea G.
author Gascón Díez, Elena
author_facet Gascón Díez, Elena
Loizeau, Jean-Luc
Cosio, Claudia
Bouchet, Sylvain
Adatte, Thierry
Amouroux, David
Bravo, Andrea G.
author_role author
author2 Loizeau, Jean-Luc
Cosio, Claudia
Bouchet, Sylvain
Adatte, Thierry
Amouroux, David
Bravo, Andrea G.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Methylmecury
Mercury methylation
Oxic water column
Sediments
Settling particles
topic Methylmecury
Mercury methylation
Oxic water column
Sediments
Settling particles
description 8 pages, 4 figures
publishDate 2016
dc.date.none.fl_str_mv 2016
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Preprint
info:eu-repo/semantics/submittedVersion
format article
status_str submittedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/376069
url http://hdl.handle.net/10261/376069
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1021/acs.est.6b03260
No
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Chemical Society
publisher.none.fl_str_mv American Chemical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869422975108775936
score 15,81155

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