Avaliação da biodisponibilidade de metais em sedimentos acidificados através da infusão de CO2 empregando bivalves (Crassostrea casar)

• Ano de defesa: 2017
• Autor(a) principal: Medeiros, Tierry Val de [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo
• Palavras-chave em Português: Oceanic acidification; Capture and storage of carbon; Mobility and bioconcentration of metals; Lysosomes; Alkalinity; Acidificação oceânica; Captura e armazenamento de carbono; Mobilidade e bioconcentração de metais; Lisossomos; Alcalinidade
• Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=5744865; https://repositorio.unifesp.br/handle/11600/50053

CO2 capture and storage activities are employed in oil exploration wells and their by-products through a CO2 injection system to reduce emissions and CO2 concentration in the atmosphere. The potential risks of CO2 leakage and ocean acidification scenarios were evaluated for their implications for mobility and bioavailability in sediments with different levels of metals by means of toxicity tests using oysters of the Crassostrea gasar species, where the stability of the lysosomal membrane and mortality. The results showed that there was mobility of metals in the sediments for Cr and Ni metals only with reference sediments. The organisms exerted a metal detoxification behavior in all pH treatments. The stability of the lysosomal membrane was significantly compromised at pH 7 and 6.5 with the reference sediments. The low occurrence of mortality (14.28% only at pH 6.5 with enriched sediments), together with the biological responses, show the adaptation of these organisms to acidification scenarios. Oysters were considered a useful bioindicator for studies in acidification scenarios.