Environmental and anthropic variabilities at Guanabara Bay (Brazil): A comparative perspective of metal depositions in different time scales during the last 5,500 yrs.

Chemosphere
R C CordeiroM F G Meniconi

Abstract

The determination of age-dated metal sediment accumulation rates in a representative South American bay is able to portray the dimension of human impacts during the colonial occupation and industrial periods. Many studies have assessed metal distribution and chronology at Guanabara Bay, in Brazil. However, understanding natural variabilities associated to paleoclimatic changes and comparing these natural variabilities to anthropogenic processes are not well established to date. Accurate geochronological control integrating ages determined by 210Pb and 14C chronologies through an exponential spline fit model allowed for a precise definition of changes associated to the holocene marine transgression, as well as the colonial period, leading to intense land use changes, and the industrial period. The reference values of the system were defined based on their concentrations and the accumulation rates of ecotoxicologically important metals. Al, Ba, Fe, Cd, Cu, Cr, Li, Ni, Mn, Pb, Si, Ti, V, and Zn distributions were determined in a Guanabara Bay core (BG-28) by the EPA 3051 method. Elemental distribution profile assessment allowed for the identification of variabilities associated to weathering processes, predominantly of lithogenic ...Continue Reading

References

Jan 14, 2003·Marine Pollution Bulletin·W MachadoL D Lacerda
Mar 30, 2004·Anais Da Academia Brasileira De Ciências·Claudia G VilelaJohn J McAllister
Aug 31, 2004·Anais Da Academia Brasileira De Ciências·Ortrud M BarthCynthia F P Luz
Dec 20, 2011·Marine Pollution Bulletin·Angela de L R WagenerArthur de L Scofield
May 24, 2016·Marine Pollution Bulletin·Ilene Matanó AbreuRicardo Erthal Santelli

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