Este estudo foi realizado em um canal de drenagem pluvial da zona urbana da cidade de Pelotas-RS, com o objetivo de determinar os níveis de metais tóxicos (Cr, Cu, Ni, Pb e Zn) no sedimento carreados pelo runoof. Foram coletadas amostra de sedimentos superficiais em cinco pontos ao longo do canal, a fração menor que 63µm sofreu de extração pseudo total nítrico-perclórica e os extratos foram analisados por espectrofotometria de absorção em chama . Os níveis de metais tóxicos encontrados variaram para o Cromo de 2,9 mg kg-¹±15,4% à 7,9 mg kg-¹±16,4%, Cobre de 4,7 mg kg-¹ ±11,0% à 20,5 mg kg-¹±6,2%. O Niquel foi detectado somente no ponto 2 no valor de 2,2 mg kg-¹±2,0%, Chumbo entre 5,4 mg kg-¹±2,9% à 22,6 mg kg-¹±3,5% e Zinco 49,0 mg kg-¹±4,1% à 100,2 mg kg-¹±6,8%. De maneira geral os analitos não ultrapassaram os limites estipulados pelo CONAMA 344/2004, não causando danos a biota e vida aquática.
The Mangueira Lagoon is 123 km long and 7.6 km wide at its widest point, with an average depth of 2.5 m. By the fact that this lagoon is one of the youngest geological formations on Earth (only 4.5 thousand years), little is known about the geology of its sediments. This work describes the concentration of the toxic metals Cr, Cu, Ni, Pb and Zn in surface sediments samples of Mangueira Lagoon. The sediment samples were collected and underwent pseudo-acid digestion (aqua regia / perchloric acid). The extracts obtained were analyzed by atomic absorption spectroscopy in flame. Cu and Zn were detected at all points during the test. Zn is a major element, ranging from 2.5 mg kg-1 ± 0.3% to 4.1 mg kg-1 ± 2.4%, followed by Cu with values between 2.0 mg kg-1 ± 8.5% to 2.5 mg kg-1 ± 4.2%. Considering the parameters established by the CCME (Canadian Environmental Quality Guidelines), TEL (Threshold Effect Level) and PEL (Probable Effect Level), the concentrations of toxic metals found in the surface sediment were low and showed low environmental impacts. These results constitute a contribution to a better understanding of the processes that occur in the region, serving as a basis for future work.
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