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Descripción
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| Effects of organic and inorganic conditioners on aggregation of suspended particles and alternated wetting-drying cycles influence on persistence of aggregates formed by the conditioners: Cardon Dato mucilage (CD) (Stenocereus griseus (Haw) F. Buxb), iron chloride, aluminum chloride and a commercial poliacrylamide (PAM) were studied. Doses tested were: 50 mg L-1 CD; 3 cmol+ kg-1 Fe+3; 3 cmol+ kg-1 Al+3; 1.5 cmol+ kg-1 Fe+3 + 1.5 cmol+ kg-1 Al+3; 50 mg L-1 CD + 1.5 cmol+ kg-1 Fe+3; 50 mg L-1 CD + 1.5 cmol+ kg-1 Al+3; 50 mg L-1 CD + 1.5 cmol+ kg-1 Fe+3 + 1.5 cmol+ kg-1 Al+3; 10 mg L-1 of PAM; and distilled water as control. An oven dried (60-70°C) Spain kaolin powder was used as substrata. Equal amounts of kaolin powder were suspended in each conditioner and submitted to four cycles of drying and wetting. The comparative effect in the Aggregation index (AgI) for three different sizes of aggregates (< 6 ìm; 6-25 ìm & >25 ìm), among those 10 treatments was analyzed by a completely randomized model with four repetitions. The effect of each wetting-drying cycle for each treatment was also analyzed by a totally Randomized model with four repetitions. The kaolin was 55% clay and 45% silt and kaolinite its main mineral. The AgI of the 50 mg L-1 CD treatment was less persistent than the one of 10 mg L-1 of PAM, and the AgI of them both were less persistent than those of all treatments that included Fe and Al. The smaller AgI persistence of these two organic conditioners could be related to their lower bonding strength among aggregated particles, which reduces their effectiveness in avoiding particles dispersion during wetting. The structuring effect of Al and Fe is more long-lasting than the one induced by the organic conditioners. | |
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Internacional
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Si |
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Nombre congreso
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EUROSOIL 2008 |
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Tipo de participación
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960 |
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Lugar del congreso
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Viena |
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Revisores
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Si |
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ISBN o ISSN
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978-3-902382-05-4 |
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DOI
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Fecha inicio congreso
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25/08/2008 |
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Fecha fin congreso
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29/08/2008 |
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Desde la página
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343 |
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Hasta la página
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343 |
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Título de las actas
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EUROSOIL2008 |