title: Assessment of bioavailability and potential toxicity of Cu, Zn and Pb, a case study in Jurujuba Sound, Rio de Janeiro, Brazil.
abstract: Potential toxicity of sedimentary Cu, Zn and Pb were evaluated based on their fractionation at the inner part of Jurujuba, a small sound at the eastern margin of Guanabara Bay, Rio de Janeiro. Biogeochemical composition revealed an environment extremely enriched with anthropic organic matter and characterized as a detrital heterotrophic system. The fractionation analysis showed that Pb exhibited more affinity with the residual fraction followed by the amorphous Fe/Mn fraction. Cu and Zn were more expressive in the amorphous Fe/Mn fraction followed by the organic one and crystalline Fe/Mn fraction, respectively. According to Igeo index, sediments proved to be highly polluted by Zn and Cu and moderated polluted by Pb. Despite the actual contamination of Jurujuba sediments, the mobility of these elements seems to be limited since the most excessive concentrations were found in the less available fractions, depending on extreme physico-chemical variations to be released.
authors: Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Avenida General Milton Tavares de Souza, s/n, Niterói, Rio de Janeiro, Brazil. Electronic address: pfalheiro@gmail.com.
authors: P F F
authors: PFF
authors: Abuchacra
authors: Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Avenida General Milton Tavares de Souza, s/n, Niterói, Rio de Janeiro, Brazil. Electronic address: val.lagemar@gmail.com.
authors: V M C
authors: VMC
authors: Aguiar
authors: Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Avenida General Milton Tavares de Souza, s/n, Niterói, Rio de Janeiro, Brazil. Electronic address: jabneto@id.uff.br.
authors: R C
authors: RC
authors: Abuchacra
authors: Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Avenida General Milton Tavares de Souza, s/n, Niterói, Rio de Janeiro, Brazil. Electronic address: coutinhoab@gmail.com.
authors: J A
authors: JA
authors: Baptista Neto
authors: Universidade Federal Fluminense, Instituto de Geociências, Departamento de Geologia e Geofísica Marinha, Avenida General Milton Tavares de Souza, s/n, Niterói, Rio de Janeiro, Brazil. Electronic address: allansan@uol.com.br.
authors: A S
authors: AS
authors: Oliveira
mesh_terms: D001938:Brazil; D005591:Chemical Fractionation; D003300:Copper / Q000032:analysis / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D007854:Lead / Q000032:analysis / Q000737:chemistry; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D015032:Zinc / Q000032:analysis / Q000737:chemistry
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D007854:Lead; D003300:Copper; D015032:Zinc
keywords: Biogeochemical composition; Guanabara Bay; Organic matter; Superficial sediments; Trace elements fractionation