VARIAÇÃO ESPACIAL E TEMPORAL DA BIODISPONIBILIDADE DE METAIS NA REGIÃO ESTUARINA DO COMPLEXO ESTUARINO-LAGUNAR DE IGUAPE-CANANÉIA, SUDESTE DO BRASIL.

The Iguape-Cananéia estuary-lagoon complex (CELIC) has different environment conditions between the northern and Southern sections, with different anthropic pressures. Current study evaluates the space and time variation of bioavailability of metals Fe, Zn, Mn, Co, Cu, Cr, Cd, Pb and Ni in sediments at 8 sites of CELIC during two periods in 2013. Metal bio-availability was assessed by the method of simultaneous extractions of metal ions and sulfates volatized by acidification (SEM/SVA). There was a broad space and time variability in the parameters under analysis where mean availability of metals followed the sequence Fe>Mn>Zn>Pb>Cu. All sites provided ratio SEM/SVA > 1 for metal ions Pb, Cd, Ni, Cu and Zn, with greater toxicity in the northern sediments. The above suggests bio-availability of the metals and highlighted the potential of the sediments, adversely affecting local biota. Results underscore the influence of numerous urban, agricultural and mining activities on the system, mainly derived from the river Ribeira de Iguape. [ABSTRACT FROM AUTHOR]