title: Distribution and ecotoxicology of bioavailable metals and As in surface sediments of Paraguaçu estuary, Todos os Santos Bay, Brazil.
abstract: Surface sediments collected in the intertidal zone of Paraguaçu estuary in July, 2013, were analyzed for organic matter, nitrogen, phosphorus, grain size fractions and partial concentrations of 16 metals. The USEPA 3051A method and ICP-OES and CV-AAS techniques were chosen to metal analysis. Pollution indices (EF, Igeo and PIN) and a comparison with sediment quality guidelines (UET, ERL, ERM, TEL and PEL of NOAA) were conducted in order to evaluate the potential metal impacts over the area. Principal Component Analysis (PCA) and Pearson correlation results showed the importance of organic matter content and the fine-grained fraction of sediments on the control of the bioavailable metals distribution. The Paraguaçu estuary already has anthropogenic enrichment relative to the background level, especially for Mn, whose values exceeded almost 30 times the background at one site (Mn: 1197.30 mg kg(-1)). However, metal levels are still below the reference values with the exception of Hg at one site (Hg: 0.25 mg kg(-1), exceeded TEL and ERL).
authors.affiliation: Núcleo de Estudos Ambientais, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Campus de Ondina, 40170-290 Salvador, BA, Brazil.
authors.forename: Taís de S
authors.initials: Tde S
authors.lastname: Pereira
authors.affiliation: Núcleo de Estudos Ambientais, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Campus de Ondina, 40170-290 Salvador, BA, Brazil; Mestrado em Energia, Escola de Engenharia e TI, Universidade Salvador (UNIFACS), Salvador, BA, Brazil. Electronic address: icarotam@gmail.com.
authors.forename: Ícaro T A
authors.initials: ÍT
authors.lastname: Moreira
authors.affiliation: Núcleo de Estudos Ambientais, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Campus de Ondina, 40170-290 Salvador, BA, Brazil; Instituto de Geociências, Departamento de Geofísica Aplicada, Universidade Federal da Bahia (UFBA), Campus de Ondina, 40170-290 Salvador, BA, Brazil.
authors.forename: Olívia M C
authors.initials: OM
authors.lastname: de Oliveira
authors.affiliation: Núcleo de Estudos Ambientais, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Campus de Ondina, 40170-290 Salvador, BA, Brazil.
authors.forename: Mariana C
authors.initials: MC
authors.lastname: Rios
authors.affiliation: Laboratório de Estudos dos Oceanos e Clima, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Carreiros, 96203-900 Rio Grande, RS, Brazil.
authors.forename: Wilton A C S
authors.initials: WA
authors.lastname: Filho
authors.affiliation: Núcleo de Estudos Ambientais, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Campus de Ondina, 40170-290 Salvador, BA, Brazil.
authors.forename: Marcos
authors.initials: M
authors.lastname: de Almeida
authors.affiliation: Núcleo de Estudos Ambientais, Instituto de Geociências, Universidade Federal da Bahia (UFBA), Campus de Ondina, 40170-290 Salvador, BA, Brazil.
authors.forename: Gilson Correia
authors.initials: GC
authors.lastname: de Carvalho
mesh_terms: D061006:Bays; D001938:Brazil; D054750:Ecotoxicology / Q000379:methods; D004784:Environmental Monitoring; D063366:Estuaries; D019015:Geologic Sediments / Q000032:analysis*; D008345:Manganese / Q000032:analysis / Q000493:pharmacokinetics; D008628:Mercury / Q000032:analysis*; D008670:Metals / Q000032:analysis* / Q000493:pharmacokinetics; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D008345:Manganese; D008628:Mercury; D009584:Nitrogen
keywords: Bioavailability; Estuaries; Metals; Sediments