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Title: Avaliação da contaminação por metais em solos impactados pela disposição de rejeitos industriais: estudo de caso- Centres (Queimados, RJ)
Keywords: Solos;  Resíduos;  Contaminantes;  Produção intelectual;  Soil;  Waste;  Contaminants
Issue Date: 28-Feb-2011
Abstract: Centro de Tecnológico de Resíduos (CENTRES) is an example of environmental liabilities in the town of Queimados, RJ. In this place, tons of industrial waste were stored without any discretion or supervision. The containers of chemical waste have suffered and caused leaks of toxic metals contact with the ground. Toxic metals in soil are associated with various organic and inorganic components, performing in various chemical forms that can interfere with the mobility of these metals in the soil. This study aims to observe the presence and mobility of metals Cadmium, Chromium, Copper, Nickel, Lead and zinc in soil from the center. For this analysis were performed to characterize the soil and pseudototais extractions and sequential samples from seven different points in the locality mentioned. The physical analysis of soil were performed using the methodology of EMBRAPA (1997). The chemical analysis to assess the concentration of metals in soil and geochemical fractionation methods were performed with the US EPA3051 and BCR, respectively. In BCR fractions soluble in acid, reducible and oxidizable, and residual are obtained by successive chemical attacks. The analysis of physical characterization showed a sandy-clay loam, with pH ranging between 4.2 and 6.9 and low cation exchange capacity. The analysis showed the concentration of contaminants in soil above the recommended values suggested by the Companhia de Tecnologia de Saneamento Ambiental (CETESB, 2005) and by CONAMA (2009), highlighting the points P5 and P6, which showed high concentrations of contaminants in area. Of the seven points analyzed, four were classified as Class 3 soils or Class 4 according to CONAMA (2009). The Geochemical fractionation of samples showed that in P1, P2, P5 and P6, the metals that have higher concentrations are also found in the exchangeable fraction of soil, the fraction most available to the environment. In contrast, zinc and lead concentrations were high in Residual Phase soil.
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