Organic Matter Role in Illitic Soil Colloids Flocculation: II. Surface Charge

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摘要：

The purpose was to investigate the mechanisms that control the effects of organic matter contents, pH, and bivalent cation type on soil flocculation. Electrophoretic mobility was independent of both Ca vs. Mg and organic matter content, which suggests that the influence of these factors on flocculation was caused by steric effects. The effect of pH on soil flocculation and electrophoretic mobility in the presence or absence of organic matter, on the other hand, was consistent with an electostatic mechanism. The change in net particle charge from pH 6 to 8 became more positive as the soluble Ca concentration was increased, and this result was modelled in terms of competitive binding of H+ and Ca2+ by soil functional groups. -from Authors

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关键词：

materia organica, calcio, suelo arcilloso, suelo, cation, sol, magnesio, matiere organique, colloide, cationes, procesos de transporte en el suelo, minerales, chimie du sol, quimica del suelo, calcium, propriete physicochimique du sol, intercambio ionico, sol argileux, magnesium, mineraux, transport dans le sol, ph, coloides, echange d'ion, propiedades fisico-quimicas suelo

DOI：

10.2136/sssaj1993.03615995005700050015x

被引量：

121

年份：

1993