title: Trace metal bioavailability in sediments from a reference site, Ribeira Bay, Brazil.
abstract: Surface sediments were collected near potential contamination sources impacting Ribeira Bay (Brazil), a system considered as a 'reference site' for trace metals. Physicochemical properties (pH and Eh), grain size and concentrations of total organic carbon (TOC), total phosphorus (TP), acid-volatile sulfides (AVS) and simultaneously-extracted metals (Fe, Mn, Cd, Cu, Ni, Pb and Zn) were analyzed. Although relatively low metal concentrations were found, correlations of Zn and Ni with high TP levels suggested an association with sewage inputs, while other metals presented associations with specific geochemical carriers (TOC, Fe and Mn compounds). AVS levels exceeding those of the sums of Cd, Cu, Ni, Pb and Zn (ΣSEM) by at least one order of magnitude and TOC-normalized differences between ΣSEM and AVS ((ΣSEM-AVS)/fOC) near to or below than -200μmolgOC(-1) indicated that there were sufficient AVS and TOC levels to control trace metal bioavailability in sediment pore water.
authors.affiliation: Departamento de Química Geral e Inorgânica, Instituto de Química, Universidade do Estado do Rio de Janeiro, 20550-900 Rio de Janeiro, RJ, Brazil. Electronic address: jninemariano@ig.com.br.
authors.forename: Janine M M
authors.initials: JM
authors.lastname: Chiappetta
authors.affiliation: Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil. Electronic address: wmachado@geoq.uff.br.
authors.forename: Wilson
authors.initials: W
authors.lastname: Machado
authors.affiliation: Departamento de Química Geral e Inorgânica, Instituto de Química, Universidade do Estado do Rio de Janeiro, 20550-900 Rio de Janeiro, RJ, Brazil. Electronic address: joanamts.uerj@gmail.com.
authors.forename: Joana M
authors.initials: JM
authors.lastname: Santos
authors.affiliation: Departamento de Química Geral e Inorgânica, Instituto de Química, Universidade do Estado do Rio de Janeiro, 20550-900 Rio de Janeiro, RJ, Brazil. Electronic address: josane@uerj.br.
authors.forename: Josane A
authors.initials: JA
authors.lastname: Lessa
mesh_terms: D000143:Acids; D061006:Bays / Q000737:chemistry*; D001682:Biological Availability; D001938:Brazil; D002244:Carbon / Q000032:analysis / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D010758:Phosphorus / Q000032:analysis / Q000737:chemistry; D013440:Sulfides / Q000032:analysis / Q000737:chemistry; D013499:Surface Properties; D014131:Trace Elements / Q000032:analysis* / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D000143:Acids; D019216:Metals, Heavy; D013440:Sulfides; D014131:Trace Elements; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D002244:Carbon
keywords: Acid-volatile sulfide; Bioavailability; Coastal sediments; Heavy metals; Reference site