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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
08/06/1995 |
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Data da última atualização: |
08/06/1995 |
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Autoria: |
BIGHAM, J. M.; GOLDEN, D. C.; BOWENS, L. H.; BUOL, S. W.; WEED, S. B. |
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Título: |
Iron oxide mineralogy of well-drained ultisols and oxisols: I. Characterization of iron oxides in soils clays by Mossbauer spectroscopy, X-ray diffractometry, and selected chemical techniques. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Soil Science Society of American Journal, v.42, n.5, p.816-824, 1978. |
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Idioma: |
Inglês |
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Conteúdo: |
The iron oxides in subsoil clays (<0.2 um) from five North Carolina Ultisols and two Brazilian Oxisols were analyzed by Mossbauer spectroscopy, X-ray diffractometry, and selected chemical techniques. Goethite and hematite were identified as the dominant crystalline iron oxides in these clays. Partial substitution of AI(III) or other nonmagnetic ions for Fe(III) in the oxide structures caused reduced unit cell dimensions and subnormal effective internal magnetic fields. All samples exhibited strong superparamagnetic relaxatgion, a collapse of the Mossbauer magnetic splitting at ambient temperatures due to the ultrafine size of the oxide particles. Neglible amounts of iron were solubilized with acid ammonium oxalate; however, the Ultisol clays did contain significant amounts of silicate and/or interlayer iron that was not extractable with dithionite-citrate-bicarbonate. |
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Palavras-Chave: |
Aluminous goethite; Mossbauer effect; Nuclear gamma resonance. |
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Thesagro: |
Solo. |
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Thesaurus Nal: |
hematite; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01658naa a2200241 a 4500
001 1784429
005 1995-06-08
008 1978 bl --- 0-- u #d
100 1 $aBIGHAM, J. M.
245 $aIron oxide mineralogy of well-drained ultisols and oxisols$bI. Characterization of iron oxides in soils clays by Mossbauer spectroscopy, X-ray diffractometry, and selected chemical techniques.
260 $c1978
520 $aThe iron oxides in subsoil clays (<0.2 um) from five North Carolina Ultisols and two Brazilian Oxisols were analyzed by Mossbauer spectroscopy, X-ray diffractometry, and selected chemical techniques. Goethite and hematite were identified as the dominant crystalline iron oxides in these clays. Partial substitution of AI(III) or other nonmagnetic ions for Fe(III) in the oxide structures caused reduced unit cell dimensions and subnormal effective internal magnetic fields. All samples exhibited strong superparamagnetic relaxatgion, a collapse of the Mossbauer magnetic splitting at ambient temperatures due to the ultrafine size of the oxide particles. Neglible amounts of iron were solubilized with acid ammonium oxalate; however, the Ultisol clays did contain significant amounts of silicate and/or interlayer iron that was not extractable with dithionite-citrate-bicarbonate.
650 $ahematite
650 $asoil
650 $aSolo
653 $aAluminous goethite
653 $aMossbauer effect
653 $aNuclear gamma resonance
700 1 $aGOLDEN, D. C.
700 1 $aBOWENS, L. H.
700 1 $aBUOL, S. W.
700 1 $aWEED, S. B.
773 $tSoil Science Society of American Journal$gv.42, n.5, p.816-824, 1978.
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