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| Melo,Vander de Freitas; Mattos,Julian Martins S.M.; Lima,Valmiqui Costa. |
| Além dos baixos teores normalmente encontrados na fração argila dos solos sob clima tropical e subtropical, o tamanho reduzido e a baixa cristalinidade dos minerais 2:1 secundários dificultam sua identificação por difratometria de raios X (DRX). Este estudo objetivou avaliar métodos químicos e físico de concentração de minerais 2:1 secundários na fração argila para facilitar a identificação por DRX, incluindo a natureza dos minerais quanto ao local de formação de cargas permanentes (lâmina tetraedral ou octaedral). Coletaram-se amostras de dois Cambissolos originados de argilito da Formação Guabirotuba na Bacia Sedimentar de Curitiba (PR): horizontes A, Bi, C1 (1,2 a 1,5 m), C2 (2,2 a 2,5 m), C3 (3,2 a 3,5 m) e C4 (4,2 a 4,5 m). Após remoção da matéria... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Esmectita; Montmorilonita; Beidelita; Nontronita; Extração sequencial. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000300006 |
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| BERNINI, T. A.; PEREIRA, M. G.; ANJOS, L. H. C. dos; PEREZ, D. V.; FONTANA, A.; CALDERANO, S. B.; WADT, P. G. S.. |
| The variety of soils in the State of Acre is wide and their chemical profiles are still not fully understood. The nature of the material of origin of these soils is indicated by the high aluminium (Al) content, commonly associated with high calcium (Ca) and magnesium (Mg) contents. The study objective was to use different methods to quantify Al in soils from toposequences formed from material of a sedimentary nature originating from the Solimões Formation, in Acre, Brazil. Trenches were opened at three distinct points in the landscape: shoulder, backslope and footslope positions. Soil samples were collected for physical, chemical, mineralogical analyses. The Al content was quantified using different methods. High Al contents were found in most of these... |
| Tipo: Artigo de periódico |
Palavras-chave: Alumínio trocável; Material sedimentar; Esmectita; Amazônia Ocidental. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/979143 |
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| BERNINI, T. A.; PEREIRA, M. G.; ANJOS, L. H. C. dos; PEREZ, D. V.; FONTANA, A.; CALDERANO, S. B.; WADT, P. G. S.. |
| The variety of soils in the State of Acre is wide and their chemical profiles are still not fully understood. The nature of the material of origin of these soils is indicated by the high aluminium (Al) content, commonly associated with high calcium (Ca) and magnesium (Mg) contents. The study objective was to use different methods to quantify Al in soils from toposequences formed from material of a sedimentary nature originating from the Solimões Formation, in Acre, Brazil. Trenches were opened at three distinct points in the landscape: shoulder, backslope and footslope positions. Soil samples were collected for physical, chemical, mineralogical analyses. The Al content was quantified using different methods. High Al contents were found in most of these... |
| Tipo: Artigo de periódico |
Palavras-chave: Alumínio trocável; Esmectita; Formação Solimões; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Aluminio intercambiable; Química del suelo.; Química do solo; Alumínio; Soil chemistry; Exchangeable aluminum.. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/981532 |
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