Metal fractionation in marine sediments acidified by enrichment of CO2: A risk assessment

Autor(es)

Romano de Orte, Manoela ; Bonnail, Estefania ; Sarmiento, Aguasanta M. ; Bautista-Chamizo, Esther ; Dolores Basallote, M. ; Riba, Inmaculada ; DelValls, Angel ; Miguel Nieto, Jose

• Tipo de documento: Artigo Científico
• Fonte: Marine Pollution Bulletin; v. 131, p. 9-pg., 2018-06-01.

Resumo

Carbon-capture and storage is considered to be a potential mitigation option for climate change. However, accidental leaks of CO2 can occur, resulting in changes in ocean chemistry such as acidification and metal mobilization. Laboratory experiments were performed to provide data on the effects of CO2-related acidification on the chemical fractionation of metal(loid)s in marine-contaminated sediments using sequential extraction procedures. The results showed that sediments from Huelva estuary registered concentrations of arsenic, copper, lead, and zinc that surpass the probable biological effect level established by international protocols. Zinc had the greatest proportion in the most mobile fraction of the sediment. Metals in this fraction represent an environmental risk because they are weakly bound to sediment, and therefore more likely to migrate to the water column. Indeed, the concentration of this metal was lower in the most acidified scenarios when compared to control pH, indicating probable zinc mobilization from the sediment to the seawater. (AU)

• Processo FAPESP: 17/06686-2 - Avaliação dos efeitos da adaptação local à acidificação oceânica em mexilhões na presença de outro estressor
• Beneficiário: Manoela Romanó de Orte
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado