Chemical characterization and recent sedimentation rates in sediment cores from Rio Grande reservoir,SP, Brazil |
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| Authors: | D I T Fávaro S R Damatto E G Moreira B P Mazzilli F Campagnoli |
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| Institution: | 1.Laboratório de Análise por Ativa??o Neutr?nica (LAN)-CRPq,IPEN/CNEN-SP,S?o Paulo,Brazil;2.Divis?o de Radiometria Ambiental, Centro de Metrologia das Radia??es (CMRA),IPEN/CNEN,SP,Brazil;3.Agência Nacional de Energia Elétrica (ANEEL) Superintendência de Estudos e Informa??es Hidrológicas/SHISGAN-Q 603 / Módulo J,Brasília,Brazil |
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| Abstract: | The Rio Grande reservoir lies southeast of the Metropolitan Area of São Paulo. In order to evaluate if the sediments contain a historical registration of anthropogenic activity, four sediment cores were sampled from the reservoir. In these cores the Hg concentration was determined by the CV AAS technique, major and trace elements by instrumental neutron activation analysis and the sedimentation rates by the 210Pb method. The results obtained for Hg are much higher than expected, showing an anthropogenic contribution. As a general trend, the elemental concentration decreases with depth, indicating recent contamination. |
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