title: Elevated mercury concentrations in soils, sediments, water, and fish of the Madeira River basin, Brazilian Amazon: a function of natural enrichments?
abstract: Previous site-specific investigations have found that mercury concentrations in water, sediments, and biota of the Brazilian Amazon are elevated above global averages, and that these concentrations are a direct result of widespread mercury amalgamation mining operations conducted by non-organized prospectors. In order to assess the regional impacts of Hg contamination from these non-organized gold mining activities, water, sediments, and fish were systematically collected in 1997 along a 900-km reach of the Madeira River. The sampling program extended from the Amazon River upstream to Porto Velho, the site of historic and ongoing mercury amalgamation mining. Mercury concentrations were found to be elevated above global averages in all sampled media. However, the geochemical data suggest that the high mercury levels are due largely to natural sources and natural biogeochemical processes, and that the impacts of anthropogenically released mercury from mine sites is relatively localized.
authors.affiliation: University of Nevada, Reno 89557, USA. plechler@nbmg.unr.edu
authors.forename: P J
authors.initials: PJ
authors.lastname: Lechler
authors.forename: J R
authors.initials: JR
authors.lastname: Miller
authors.forename: L D
authors.initials: LD
authors.lastname: Lacerda
authors.forename: D
authors.initials: D
authors.lastname: Vinson
authors.forename: J C
authors.initials: JC
authors.lastname: Bonzongo
authors.forename: W B
authors.initials: WB
authors.lastname: Lyons
authors.forename: J J
authors.initials: JJ
authors.lastname: Warwick
mesh_terms: D000818:Animals; D001938:Brazil; D004781:Environmental Exposure; D004784:Environmental Monitoring; D005399:Fishes / Q000378:metabolism*; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis*; D006046:Gold; D008628:Mercury / Q000032:analysis* / Q000493:pharmacokinetics; D008906:Mining; D012989:Soil Pollutants / Q000032:analysis*; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D014873:Water Pollutants; D006046:Gold; D008628:Mercury