RESUMO

We present an alternative approach for establishing in situ bioaccumulation assessment of methyl-Hg (MeHg), total-Hg, Cd, Pb and Zn in bivalve Anomalocardia brasiliana from four bays of Rio de Janeiro presenting varying degrees of eutrophication, acid volatile sulfides (2-55 µmol g-1), simultaneously extracted metals (SEM) and total metals (TM) in sediments. Using metal concentrations of composite samples from three size classes of bivalve and their incorporation rates (IR = metal concentration / total length), which depend on exposure time, we calculated asymptotic IR and respective consequent metal concentrations. Both IR and the metal concentration presented inverse relationships with total length (excepting MeHg) and bay contamination. Lead and zinc concentrations were above Brazilian legal criteria in the most anoxic and contaminated bay, suggesting significant metal bioavailability (SEM/TM between 8% and 63%).

Assuntos

Bivalves/efeitos dos fármacos , Mercúrio/análise , Metais Pesados/análise , Metais Pesados/farmacocinética , Poluentes Químicos da Água/análise , Animais , Baías , Disponibilidade Biológica , Bivalves/metabolismo , Tamanho Corporal , Brasil , Biomarcadores Ambientais , Monitoramento Ambiental , Sedimentos Geológicos/análise , Mercúrio/farmacocinética , Compostos de Metilmercúrio/análise , Compostos de Metilmercúrio/farmacocinética , Sulfetos/análise , Poluentes Químicos da Água/farmacocinética