FRANKLIN, ROBSON L.FAVARO, DEBORAH I.T.FERREIRA, FRANCISCO J.BEVILACQUA, JOSE E.2014-11-172014-11-182015-04-022014-11-172014-11-182015-04-02FRANKLIN, ROBSON L.; FAVARO, DEBORAH I.T.; FERREIRA, FRANCISCO J.; BEVILACQUA, JOSE E. Major and trace elements assessment in sediment samples from Rio Grande reservoir, by neutron activation analysis. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE; MEETING ON NUCLEAR APPLICATIONS, 9th; MEETING ON REACTOR PHYSICS AND THERMAL HYDRAULICS, 16th; MEETING ON NUCLEAR INDUSTRY, 1st, September 27 - October 2, 2009, Rio de Janeiro, RJ. <b>Proceedings...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/12303.http://repositorio.ipen.br/handle/123456789/12303The Rio Grande Reservoir, Southeast of the São Paulo Metropolitan Area (SPMA) supplies water for four counties (São Bernardo do Campo, São Caetano do Sul, Santo André and Diadema). It has been seriously affected by urban expansion, due to chaotic urban occupation and improper use of the surrounding areas. In this study bottom sediment samples were collected, by using a Van Veen sampler, during the dry and rainy seasons. Four sampling points were defined by using GPS and are located at the mouth of the Rio Grande and Ribeirão Pires Rivers, in the middle of the reservoir and near the catchment point of the water supply. The sediment samples were submitted to instrumental neutron activation analysis (INAA) and the following elements were determined: As, Ba, Br, Co, Cr, Cs, Rb, Sb, Sc, Se, Ta, Th, U e Zn and the rare earth elements Ce, Eu, La, Lu, Nd, Sm, Tb, Yb. Short irradiation was also performed for total Hg determination by NAA using 197Hg radioisotope. This was possible due to the high Hg concentration levels in these sediments. The methodology validation was carried out by certified reference material analyses. The results obtained for multielemental concentrations in the sediment samples were compared to NASC (North American Shale Composite) values. The concentration values obtained for As and metals Cr, Hg and Zn in the sediment samples were compared to the Canadian Council of Minister of the Environment (CCME) oriented values (TEL and PEL values) and adopted by CETESBopenAccessexperimental datamercury 197multi-element analysisneutron activation analysisrare earthsriverssedimentstrace amountsvalidationwater reservoirswater supplyTexto completo de evento