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Registro Completo |
Biblioteca(s): |
Embrapa Pantanal. |
Data corrente: |
14/08/1995 |
Data da última atualização: |
14/08/1995 |
Autoria: |
SINGH, S. S.; MILES, N. M. |
Título: |
Effect of sulfate ions on the stability and exchange characteristics of an aluminum- interlayered Wyoming bentonite. |
Ano de publicação: |
1978 |
Fonte/Imprenta: |
Soil Science, v.126, n.6, p.323-329, 1978. |
Idioma: |
Inglês |
Conteúdo: |
Aluminum-interlayered, Wyoming bentonite suspensions, containing different amounts of
precipitated Al, were equilibrated with SO4 solutions at different concentrations. The amount of Al precipitated as Al-hydroxy complex was 400, 550, and 750 me/100 g clay, and the concentration of SO4 in solution was 10, 20, and 30 me/1. On equilibration, the
hydroxy-Al interlayer precipitate in the Wyoming bentonite reacted with SO4 ions, and a neutral precipitate of aluminum hydroxy sulfate was formed. Heating the Wyoming bentonite to 700C resulted in complete collapse, showing that the precipitate was no longer present in the interlayer space. A crystalline compound of aluminum hydroxy sulfate was formed as evidenced by x-ray diffraction patterns. In the case of Al-interlayered, Wyoming bentonite suspensions that were not equilibrated with SO4 solution, the Al-hydroxy precipitate remained in the interlayer space and blocked the exchange sites. Treatment of these samples with SO4 solutions resulted in an increasem of exchange capacity that was concentration-dependent. |
Palavras-Chave: |
Fertility; Sulfate; Wyoming bentonite. |
Thesagro: |
Alumínio; Fertilidade; Solo; Sulfato. |
Thesaurus Nal: |
aluminum; soil. |
Categoria do assunto: |
-- |
Marc: |
LEADER 01709naa a2200241 a 4500 001 1785493 005 1995-08-14 008 1978 bl --- 0-- u #d 100 1 $aSINGH, S. S. 245 $aEffect of sulfate ions on the stability and exchange characteristics of an aluminum- interlayered Wyoming bentonite. 260 $c1978 520 $aAluminum-interlayered, Wyoming bentonite suspensions, containing different amounts of precipitated Al, were equilibrated with SO4 solutions at different concentrations. The amount of Al precipitated as Al-hydroxy complex was 400, 550, and 750 me/100 g clay, and the concentration of SO4 in solution was 10, 20, and 30 me/1. On equilibration, the hydroxy-Al interlayer precipitate in the Wyoming bentonite reacted with SO4 ions, and a neutral precipitate of aluminum hydroxy sulfate was formed. Heating the Wyoming bentonite to 700C resulted in complete collapse, showing that the precipitate was no longer present in the interlayer space. A crystalline compound of aluminum hydroxy sulfate was formed as evidenced by x-ray diffraction patterns. In the case of Al-interlayered, Wyoming bentonite suspensions that were not equilibrated with SO4 solution, the Al-hydroxy precipitate remained in the interlayer space and blocked the exchange sites. Treatment of these samples with SO4 solutions resulted in an increasem of exchange capacity that was concentration-dependent. 650 $aaluminum 650 $asoil 650 $aAlumínio 650 $aFertilidade 650 $aSolo 650 $aSulfato 653 $aFertility 653 $aSulfate 653 $aWyoming bentonite 700 1 $aMILES, N. M. 773 $tSoil Science$gv.126, n.6, p.323-329, 1978.
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Embrapa Pantanal (CPAP) |
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