Potential impact of tide-regulation barriers on the formation of methylmercury in the Venice Lagoon (Italy)
Pereira-Garcia, Carla (Institut de Ciències del Mar)
Bravo, Andrea G. (Institut de Ciències del Mar)
Cosio, Claudia (Université de Reims Champagne Ardennes)
Gallorini, Andrea (University of Geneva)
Leoni, Simone (Istituto di Scienze Marine)
Cassin, Daniele (Istituto di Scienze Marine)
Guédron, Stéphane (University of Grenoble Alpes)
Adatte, Thierry (Institute of Earth Sciences)
Cabrera-Brufau, Miguel (Institut de Ciències del Mar)
Sánchez Martínez, M. Olga (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
Acinas, Silvia G. (Institut de Ciències del Mar)
Amouroux, David (Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux)
Zonta, Roberto (Istituto di Scienze Marine)
Dominik, Janusz (Istituto di Scienze Marine)
Loizeau, Jean-Luc (University of Geneva)

Data:	2025
Resum:	Methylmercury (MeHg), a neurotoxic pollutant, is formed mainly under anaerobiosis. The "Modulo Sperimentale Elettromeccanico" (MOSE), built to temporarily close the Venice Lagoon and protect the city from flooding, induces changes in the hydrological regime, reducing water circulation and decreasing in the dissolved oxygen concentrations of the lagoon. Our study shows the potential changes in sediment and overlying water physico-chemistry in a simulated MOSE closing-event by incubating sediment cores for 48 h in the laboratory and deploying benthic chambers. In the incubated summer cores (September 2021), a significant increase in total Hg and MeHg concentrations in the water column was observed and associated with an increase in MeHg formation rates - particularly, MeHg formation rates doubled during the simulated MOSE-closing. This increase was associated to a release of dissolved organic carbon and to an enrichment of proteinaceous substances and reactive humic acids in the overlying waters. All these effects were not evident in late autumn (November 2019), when water temperature was 10 °C lower than in September 2021. Our study suggests that hydrological changes caused by the MOSE closure may in some periods increase MeHg concentrations within the Venice Lagoon.
Ajuts:	Agencia Estatal de Investigación RYC2019-028400 European Commission 749645 Instituto de Salud Carlos III FPU16-01925 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-0047 Agencia Estatal de Investigación CEX2019-000298-S
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	MeHg formation ; Sediments ; Temperature ; MOSE ; Venice Lagoon ; Oxygen depletion
Publicat a:	Journal of hazardous materials, Vol. 485 (March 2025) , art. 136747, ISSN 1873-3336

DOI: 10.1016/j.jhazmat.2024.136747

11 p, 1.6 MB

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