title: Bioavailability of pollutants in bacterial communities of Rodrigo de Freitas Lagoon, Rio de Janeiro, Brazil.
abstract: Processes involving heavy metals and other contaminants continue to present unsolved environmental questions. To advance the understanding of geochemical processes that involve the bioavailability of contaminants, cores where collected in the Rodrigo de Freitas lagoon, and analyzed for bacterial activity and metal concentrations. Results would suggest an extremely reducing environment where organic substances seem to be the predominant agents responsible for this geochemical process. Analytical data showed sulphate reduction to be the main agent driving this process, since this kind of bacteria was found to be active in all of the samples analyzed. Esterase enzyme production did not signal the influence of heavy metals and hydrocarbon concentrations and heavy metals were found to be unavailable for biota. However, correlation between results for bacterial biomass and the potentially mobile percentage of the total Ni concentrations would suggest a negative impact.
authors.affiliation: Departamento de Geologia Universidade Federal Fluminense NiteróiRJ Brazil Departamento de Geologia, Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: E M
authors.initials: EM
authors.lastname: da Fonseca
authors.affiliation: Departamento de Geologia Universidade Federal Fluminense NiteróiRJ Brazil Departamento de Geologia, Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: J A
authors.initials: JA
authors.lastname: Baptista Neto
authors.affiliation: School of Geography Queen's University BelfastNorthern Ireland United Kingdom School of Geography, Queen's University, Belfast, Northern Ireland, United Kingdom.
authors.forename: J J
authors.initials: JJ
authors.lastname: McAlister
authors.affiliation: School of Geography Queen's University BelfastNorthern Ireland United Kingdom School of Geography, Queen's University, Belfast, Northern Ireland, United Kingdom.
authors.forename: B J
authors.initials: BJ
authors.lastname: Smith
authors.affiliation: Laboratório de Microbiologia Marinha Departamento de Biologia Marinha Universidade Federal Fluminense NiteróiRJ Brazil Laboratório de Microbiologia Marinha, Departamento de Biologia Marinha, Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: M A C
authors.initials: MA
authors.lastname: Crapez
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001682:Biological Availability; D001938:Brazil; D019216:Metals, Heavy / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism; D014871:Water Microbiology; D014873:Water Pollutants / Q000378:metabolism*
chemical_list: D019216:Metals, Heavy; D010710:Phosphates; D014873:Water Pollutants
keywords: bacterial communities; heavy metals fraccionament; sediment cores