title: Combined SEM/AVS and attenuation of concentration models for the assessment of bioavailability and mobility of metals in sediments of Sepetiba Bay (SE Brazil).
abstract: This study proposes a new methodology to study contamination, bioavailability and mobility of metals (Cd, Cu, Ni, Pb, and Zn) using chemical and geostatistics approaches in marine sediments of Sepetiba Bay (SE Brazil). The chemical model of SEM (simultaneously extracted metals)/AVS (acid volatile sulfides) ratio uses a technique of cold acid extraction of metals to evaluate their bioavailability, and the geostatistical model of attenuation of concentrations estimates the mobility of metals. By coupling the two it was observed that Sepetiba Port, the urban area of Sepetiba and the riverine discharges may constitute potential sources of metals to Sepetiba Bay. The metals are concentrated in the NE area of the bay, where they tend to have their lowest mobility, as shown by the attenuation model, and are not bioavailable, as they tend to associate with sulfide and organic matter originated in the mangrove forests of nearby Guaratiba area.
authors.affiliation: Mestrado de Gestão Ambiental e Sustentabilidade, Universidade Nove de Julho (UNINOVE), Av. Francisco Matarazzo, 612, prédio C, andar térreo, Água Branca, São Paulo, SP 05001 100, Brazil. andrezp@uninove.br
authors.forename: Andreza Portella
authors.initials: AP
authors.lastname: Ribeiro
authors.forename: Ana Maria Graciano
authors.initials: AM
authors.lastname: Figueiredo
authors.forename: José Osman
authors.initials: JO
authors.lastname: dos Santos
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Dantas
authors.forename: Marycel Elena Barboza
authors.initials: ME
authors.lastname: Cotrim
authors.forename: Rubens Cesar Lopes
authors.initials: RC
authors.lastname: Figueira
authors.forename: Emmanoel V
authors.initials: EV
authors.lastname: Silva Filho
authors.forename: Julio Cesar
authors.initials: JC
authors.lastname: Wasserman
mesh_terms: D061006:Bays / Q000737:chemistry*; D001938:Brazil; D004784:Environmental Monitoring / Q000379:methods; D019015:Geologic Sediments / Q000737:chemistry*; D008670:Metals / Q000032:analysis*; D008956:Models, Chemical; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000706:statistics & numerical data*
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical