Avaliação de metais-traço no sedimento do sistema estuarino dos rios Piraquê-Açu e Piraquê-Mirim (Aracruz-ES)

Abstract

It has been determined the Acid Volatile Sulfide(AVS)distribution, Simultaneously Extracted Metals(SEM),some physical-chemical parameters, (oxidation reduction potential, temperature and dissolved oxygen) and organic matterinto the mangrovesediment of the Piraquê-açuand Piraquê-mirim rivers in the district of Santa Cruz(Aracruz –ES). To the AVS and SEM (Cd, Cu, Pb, Ni and Zn) extracted from the sample with cloridricacid 6 mol/L,the Equilibrium Partitioning Modeland comparison with the Lowest Effect Level(LEL),the Probable Effect Level(PEL),the Dutch List,the German List,the CONAMA nº 344 andCETESB(2005)has been applied. Yet the SEM and the values Jesuset al. (2009) reported have been applied, to calculate the Geoaccumulation Index(lgeo),the Enrichment Factor (EF) and to the comparison with values reported from other regions of Brazil.The results found from pH, EH, temperature, DO, AVSandorganic matter appear into the expected values to the estuarine systems. The SEMare below national and internationalvalues (LEL,PEL, Dutch List,German List,CONAMA nº 344 and CETESB) and other regions ofBrazil. The usage of the Equilibrium Partitioning Modelsuggests the non bioavailability of metals. The analyses onto the lgeo and the EF classify the estuarinesystem as not having antropic influence.Results show a low antropic impactof the surrounding communitiesand the estuarine system appears with no environment contamination as the acquired values refer to natural processes of the estuary itself