Sedimentary profiles from a water supply reservoir at São Paulo, Brazil
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2019
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INTERNATIONAL CONFERENCE ON MODERN TRENDS IN ACTIVATION ANALYSIS, 15th
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A research project has been conducted by the Environmental Company of São Paulo State (CETESB) and the Nuclear
and Energy Research Institute (IPEN) in important water supply reservoirs at São Paulo State in order to perform a wide
evaluation on the content of rare earths and some trace elements in sediment profiles. In the present study, preliminary
results for two sampling campaigns at the Graminha reservoir are presented:February/2015 (sites 1 and 3) and August / 2015
(sites 1 and 2). Sediment core samples (around 90 cm long) were collected in the dam and sliced at every 2.5 cm. Instrumental
Neutron Activation Analysis (INAA) was applied to the sediment samples in order to determine some trace elements (As,
Cr, Th, U and Zn) and rare earth elements (REE) (Ce, Eu, La, Lu, Nd, Sm, Tb and Yb). The analytical methodology validation
was performed by means of certified reference material analyses. As, Cr and Zn concentration values were compared to the
oriented values from CCME (Canada) (TEL and PEL). Sediment quality was classified as good or very good for these
elements according these criteria. Enrichment factor (EF) and Geoaccumulation Index (IGeo index)1were applied to the
results by using the concentration values of the last layer of the 90.0 cm profile as background values for sediment
contamination index assessment. EF>1.5 was found for REE, U and Th in the middle of the sediment profiles,in all sampling
points, indicative of anthropogenic contribution. IGeo values in the range of1
Como referenciar
SILVA, S.A.; JUNQUEIRA, L.S.; FRANKLIN, R.L.; SILVA, W.L.; FAVARO, D.I.T.; MOREIRA, E.G. Sedimentary profiles from a water supply reservoir at São Paulo, Brazil: trace and rare earth elements assessment by INAA. In: ACHARYA, R. (ed.); SWAIN, K.K. (ed.); SATHYAPRIYA, R.S. (ed.); REDDY, A.V.R. (ed.); PUJARI, P.K. (ed.). In: INTERNATIONAL CONFERENCE ON MODERN TRENDS IN ACTIVATION ANALYSIS, 15th, November 17-22, 2019, Mumbai, India. Abstract... Mumbai, India: Bhabha Atomic Research Centre, 2019. p. 79-79. Disponível em: http://repositorio.ipen.br/handle/123456789/31024. Acesso em: 03 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.