SORAYA MARIA RIZZO DA ROCHA
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Publicação IPEN-doc 01502 Determinacao de agua em materiais de interesse nuclear pelo metodo de Karl Fisher1987 - PEREIRA, W.; ROCHA, S.M.R.; ATALLA, L.T.; ABRAO, A.Resumo IPEN-doc 04639 Caracterizacao termica de composito microesferas de alumina poli( acido acrilico)1996 - QUEIROZ, A.A.A.; BARRAK, E.R.; ROCHA, S.M.R.; MAERKL, M.W.; LUGAO, A.B.Resumo IPEN-doc 03829 Preparacao de microesferas de alumina1990 - RODRIGUES, J.A.J.; ZACHARIAS, M.A.; AQUINO, A.R.; ROCHA, S.M.R.Resumo IPEN-doc 02230 Preparacao de microesferas de oxidos mistos, uranio-gadolinio, uranio-cerio e uranio-lantanio pelo processo sol-gel1993 - ROCHA, S.M.R.; MENDES, A.C.N.; AQUINO, A.R.Resumo IPEN-doc 16204 Obtaining pure praseodymium acetate to use in researches and development2010 - QUEIROZ, CARLOS A. da S.; ROCHA, SORAYA M.R. da; PEDREIRA, WALTER R.; SENEDA, JOSE A.; LOBO, RAQUEL M.; S. FILHO, WALTERThis paper presents a simple and economical procedure to obtain high purity praseodymium acetate. The raw material in the form of mixed rare earths carbonate comes from a industrial separation of rare earths, thorium and uranium in the brasilian monazite. It is used the tecnique of strong cation exchange resin, proper to water treatment, to the praseodymium's fractionation and it is achieved a purity of 99.9% in Pr6O11 and yield greater than or equal 60%, with the elution of rare earths by EDTA solution in pH controlled. The complex of EDTA-praseodymium is transformed in praseodymium oxide, subsequently the oxide is dissolved in acetic acid to obtain the praseodymium acetate. The molecular absorption spectrophotometry tecnique is used to monitoring the praseodymium content during the process and mass spectrometry to certification the purity of the praseodymium acetate. The typical praseodymium acetate obtained presents the followings contaminants in micrograms per gram: Sc(18.20±0.22); Y (20.20 ± 0.20); La (6.75 ± 0.81); Ce (26.10 ± 0.70); Nd (3.31 ± 0.63); Sm (18.30 ± 0.80); Eu (17.00 ± 0.90); Gd (19.40 ± 0.40); Tb (16.30 ± 0.50); Dy (16.90 ± 0.50), Ho(17.90 ± 0.10); Er (18.40 ± 0.70); Tm (16.90 ± 0.10); Yb (17.60 ± 0.60); Lu (17.70 ± 0.50). The high purity praseodymium acetate comes being applied, replacing the imported product, in research and development area on rare earth catalysts.Resumo IPEN-doc 08922 Resurgence of an old test for identification of lanthanum2001 - ABRAO, A.; RIZZO, S.M.; QUEIROZ, C.A.S.Resumo IPEN-doc 12633 Advanced mass spectrometric applied to determinated of composition in lead (Pb-208) from residues of thorium facilities2007 - SENEDA, JOSE A.; QUEIROZ, CARLOS A. da S.; RIZZO, SORAYA M. da R.; DIAS, MAURO S.; KAKAZU, MAURICIO H.; ABRAO, ALCIDIOResumo IPEN-doc 12511 Characterization of lanthanium oxide on the thermal stability of gamma alumina catalyst supports2007 - ROCHA, S.M.R.; VASCONCELLOS, M.E. de; QUEIROZ, C.A.S.; FORBICINI, C.A.L.G.O.; SENEDA, J.A.; PEDREIRA, W.R.Artigo IPEN-doc 05648 Obtencao e uso catalitico do nitreto de uranio1994 - ROCHA, S.M.R.; AQUINO, A.R.; ABRAO, A.Artigo IPEN-doc 15849 Obtencao experimental de acetato de praseodimio de alta pureza a partir de carbonatos mistos de terras raras2010 - QUEIROZ, C.A. da S.; ROCHA, S.M.R. da; PEDREIRA, W.R.; SENEDA, J.A.; LOBO, R.M.; FILHO, W.S.