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

絮凝作用 化学 电泳 有机质 胶体 表面电荷 无机化学 分析化学(期刊) 环境化学 色谱法 有机化学 物理化学
作者
Dean Heil,Garrison Sposito
出处
期刊:Soil Science Society of America Journal [Wiley]
卷期号:57 (5): 1246-1253 被引量:45
标识
DOI:10.2136/sssaj1993.03615995005700050015x
摘要

Abstract The ability to predict the effect of various factors on soil flocculation depends on a knowledge of the mechanisms by which those factors operate. The purpose of this study was to investigate the mechanisms that control the effects of organic matter content, pH, and bivalent cation type on soil flocculation. The electrophoretic mobility of an illitic soil before and after treatment with H 2 O 2 was measured at a soluble Ca or Mg charge fraction of 0.0 to 0.9 at pH 6, and at pH 4 to 9 and a soluble Ca charge fraction of 0.0 or 0.5 The change in the net particle charge as pH was increased from 6 to 8 at a soluble Ca concentration of 0.65 and 2.26 mol m −3 was determined from proton and Ca ion titrations. 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 electrostatic 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 modeled in terms of competitive binding of H + and Ca 2+ by soil functional groups.

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