00985nam a2200193 a 450000100080000000500110000800800410001910000180006024501010007826001590017930000160033849000090035452003150036365300300067865300160070870000210072470000260074570000200077110453442022-05-06       2004    bl uuuu     u00u1 u    #d1 aVIEIRA, E. C.  aComposition of brazilian phosphate rocks used for cattle feed supplement.h[electronic resource]  aIn: RIO SYMPOSIUM ON ATOMIC SPECTOMETRY, 8., 2004, Parati. Book of Abstracts... Rio de Janeiro: Pontifícia Universidade Católica do Rio de Janeiroc2004  ap.126. v. 1  vv. 1  aPbospbate rocks cünstitute lhe bulk of the raw materiaIs for the manufacture fertilizers and some phosphorus b-ased chemicals. !t is well known that natural pbosphate a great varíation of heavy melaIs, and some of lhem, depending of tlleir cOllcentratÍon, present nutritional lmd environmental problems [1].  aBrazilian phosphate rocks  aCattle feed1 aMORAES, S. D. S.1 aNOGUEIRA, A. R. de A.1 aNÓBREGA, J. A.