1000 resultados para Metais pesados
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Ps-graduao em Zootecnia - FCAV
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Ps-graduao em Zootecnia - FCAV
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Ps-graduao em Qumica - IQ
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Ps-graduao em Qumica - IQ
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)
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Ps-graduao em Cincia dos Materiais - FEIS
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Cintra stream is the major receiver of treated effluent from sanitary, hospital and research laboratory sewage from the UNESP campus in Botucatu, Rubio Jnior District, So Paulo state; and it has shown evidence of diffuse contamination by metals along it. Analyses of the most toxic metals (Pb, Cu, Fe, Ni and Zn) were carried out by using an atomic absorption spectrometer AA-6.800 - Perkin Elmer, analyst 700. ANOVA followed by the Tukey test were used for data analyses at 5% significance level. The main objective of this study was to compare current data on metal levels with data from other studies, in the same area, and of the same nature, conducted before and after implementation of chemical residue management by the university in 2008. Also, it aimed at identifying and quantifying possible diffuse and punctual contamination. Sites S1 and S2 showed punctual contamination, while diffuse sources were observed between S4 and S5. The quality of water in the Cintra Stream improved after establishment of the program of laboratory chemical residue management in the Campus of UNESP.
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Fundao de Amparo Pesquisa do Estado de So Paulo (FAPESP)
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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Coordenao de Aperfeioamento de Pessoal de Nvel Superior (CAPES)
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This study investigated the contamination of the Ribeira de Iguape River - RIR by Cd, Zn, Cr and Pb, using the bivalve Anodontites tenebricosus as a biomonitor. Metal concentrations in tissue samples were measured by HR-ICPMS. Bivalve tissues exhibited mean levels of 1.00 g/g Cd; 152.89 g/g Zn; 14.79 g/g Cr and 4.40 g/g Pb. Lead concentrations were comparable to those reported for moderately contaminated sites. The results showed that Pb is bioavailable to the bivalves, exhibiting high concentrations and exceeding both natural and reference values for human consumption. The freshwater bivalve Anodontites tenebricosus is a suitable biomonitor of contamination by metals.