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  • 1 IPEN-CNEN/SP Supervisão de Radioquímica Caixa Postal 11049-Pinheiros CEP 05422-970 São Paulo-SP Brasil
  • 2 IPEN-CNEN/SP Supervisão de Radioquímica Caixa Postal 11049 - Pinheiros CEP 05422-970 São Paulo-SP Brasil
  • 3 da Universidade Federal de Lavras Departamento de Zootecnia Caixa Postal 37 CEP 37200-000 Lavras - Minas Gerais-MG Brasil
  • 4 Centro de Pesquisa de Pecuária do Sudeste - CPPSE/EMBRAPA Caixa Postal 339 CEP 13560-970 São Carlos-SP Brasil
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Instrumental neutron activation analysis (INAA) with gamma-ray spectrometry was applied to determine As, Ca, Cd, Cl, Co, Cu, Cr, Fe, Hg, K, Mg, Mn, Mo, Na, Sb, Se and Zn in the Brazilian agroindustrial by-products. These materials are widely used in ruminant feeding. The results obtained were compared with requirement and maximum tolerable concentrations. The general conclusions from the data obtained were: (1) many by-products presented concentrations of some essential elements lower than the requirement concentrations, while in some concentrations of Cr, Fe, Mg and Se exceeded by a little the maximum tolerable concentrations, (2) the elements As, Cd, Hg and Sb, generally considered toxic, showed concentrations lower than maximum tolerable values.