01480naa a2200313 a 450000100080000000500110000800800410001910000190006024500820007926000090016130000160017052004930018665000250067965000090070465000240071365000230073765000090076065300190076965300110078865300080079965300460080765300080085365300080086165300260086970000160089570000240091170000200093577302110095510247592008-05-07       2002    bl ---       0--  u    #d1 aNOVOTNY, E. H.  aEffect of residual vanadyl in the spectroscopic analyses of soil humic acids.  c2002  ap. 298-301.  aIn this work we check possible interference of paramagnetic ions bounded to humic acids, as detected by EPR, in analysis performed by some spectroscopic techniques, which, generally, provides relevant information on structural  and functional groups of humic acids. Applying this approach, information about the effect of these metals on obscuring the results otained by spectroscopic techniques as well as about functional groups that involved in the binding of these ions were obtained.  acarbon sequestration  aions  asoil organic matter  aMatéria Orgânica  aSolo  aÁcido húmico  aBrasil  aEPR  aEspectroscopia paramagnética eletrônica  aESR  aNMR  aSeqüestro de carbono1 aKNICKER, H.1 aMILORI, D. M. B. P.1 aMARTIN-NETO, L.  tIn: INTERNATIONAL HUMIC SUBSTANCES SOCIETY-IHSS; ANNIVERSARY CONFERENCE, 20., 2002, Boston. IHSS 2002: humic substances: nature's most versatile materials.proceedings. Boston: Northeastern University, 2002.