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Mobilization of mercury by sediment transport after a prescribed fire in NE Portugal: Insight into size classes and temporal variation

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dc.contributor.authorMéndez-López, Melissa
dc.contributor.authorParente-Sendín, Andrea
dc.contributor.authorAcemel-Míguez, Lara
dc.contributor.authorFonseca, Felícia
dc.contributor.authorSantos, Israel
dc.contributor.authorFigueiredo, Tomás de
dc.contributor.authorArias-Estévez, Manuel
dc.contributor.authorAlonso-Vega, Flora
dc.contributor.authorNóvoa-Muñoz, Juan Carlos
dc.date.accessioned2025-01-13T10:46:41Z
dc.date.available2025-01-13T10:46:41Z
dc.date.issued2025
dc.description.abstractTerrestrial ecosystems are important sinks for atmospheric mercury (Hg). It is well known that high severity wildfires can mobilize Hg in the surroundings of burned areas due to changes in ecosystem stability, but it is unclear whether this also occurs after lower severity fires, such as prescribed fires. The present study determined Hg concentrations and mobilization rates in different size fractions of sediments collected after a prescribed fire in a scrubland area. Sediments, collected from eight erosion plots on six occasions, were analysed for total Hg, C and N in several size classes (<0.2 mm, 0.2–0.5 mm, 0.5–2 mm and >2 mm) and Hg mobilization rates (HgST) were calculated for each size fraction. Average total Hg were 38, 57, 94 and 126 μg kg^-1 for size fractions > 2, 0.5–2, 0.2–0.5 and < 0.2 mm, respectively. Total Hg was negatively correlated with C/N ratio, involving the humification degree of organic matter of sediments in Hg retention. In the last event (eight months after fire), sediments had 45–106 % more Hg, depending on size fraction, compared to the initial event. Mercury mobilization rates varied between 32 and 78 mg ha^-1, with the fraction 0.5–2 mm accounting for 46 % of the mobilized Hg. The results revealed that prescribed fires can mobilize Hg, so their use to prevent wildfires must be done with caution.pt_PT
dc.description.sponsorshipThis work results from a collaboration supported, scientifically and financially, by the following research projects: the Interreg V-A Spain- Portugal program (POCTEP) 2014–2020 (Project 0701_TERRAMATER_ 1_E) funded by the European Regional Development Fund (FEDER), and the Grant PID 2021–125114OB-I00 funded by MICIU/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”. M. Méndez-López was supported by the predoctoral grant FPU (FPU17/05484) funded by the Ministerio de Educación y Formación Profesional. The financial support of the Consellería de Cultura, Educación e Universidade (Xunta de Galicia) through the contract ED431C2021/46-GRC granted to the research group BV1 of the University of Vigo is also recognized. Open-access funding for this research has been provided by the University of Vigo/CISUG.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMéndez-López, Melissa; Parente-Sendín, Andrea; Acemel-Míguez, Lara; Fonseca, Felicia; Santos, Israel; Figueiredo, Tomás de; Arias-Estévez, Manuel; Alonso-Vega, Flora; Nóvoa-Muñoz, Juan Carlos (2025). Mobilization of mercury by sediment transport after a prescribed fire in NE Portugal: Insight into size classes and temporal variation. Journal of Hazardous Materials. ISSN 0304-3894. 484, p. 1-8pt_PT
dc.identifier.doi10.1016/j.jhazmat.2024.136657pt_PT
dc.identifier.issn0304-3894
dc.identifier.urihttp://hdl.handle.net/10198/30935
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectHeavy metalpt_PT
dc.subjectErosionpt_PT
dc.subjectRunoffpt_PT
dc.subjectMobilizationpt_PT
dc.subjectWildfirept_PT
dc.subjectPrescribed firept_PT
dc.titleMobilization of mercury by sediment transport after a prescribed fire in NE Portugal: Insight into size classes and temporal variationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage8pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleJournal of Hazardous Materialspt_PT
oaire.citation.volume484pt_PT
person.familyNameFonseca
person.familyNameSantos
person.familyNameFigueiredo
person.givenNameFelícia
person.givenNameIsrael
person.givenNameTomás d'Aquino
person.identifier1297327
person.identifier.ciencia-idCA13-F7CD-EE4C
person.identifier.ciencia-id961D-607D-51CC
person.identifier.orcid0000-0001-7727-071X
person.identifier.orcid0000-0003-2638-9432
person.identifier.orcid0000-0001-7690-8996
person.identifier.scopus-author-id36970960500
person.identifier.scopus-author-id54790554500
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication4f6f8be1-73c1-45bb-b159-ce3f8ff96c84
relation.isAuthorOfPublication70736b40-ed1b-408a-bb2a-7b1a3236aa92
relation.isAuthorOfPublicationdb897e48-ecf7-4ce1-ba27-369260337510
relation.isAuthorOfPublication.latestForDiscovery4f6f8be1-73c1-45bb-b159-ce3f8ff96c84

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