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The effect of adsorbed humic substances on the colloid stability of hematite particles



The effect of adsorbed humic substances on the colloid stability of hematite particles



Colloids and Surfaces 5(2): 85-92



Rate constants (k) were measured for the Ca2+-induced coagulation of hematite particles in the presence of different amounts of humic substances at pH 6.6. Values of k at 1 mg humics/l were .apprx. 1 order of magnitude greater than those at 20 mg/l at all CaCl2 concentrations studied (0.001-0.5 M). The enhanced stability apparently is not due to charge stabilization, since electrophoretic mobilities were almost independent of the extent of adsorption. Steric stabilization at high adsorption density is a likely explanation. Interpretation of the results is complicated by the increase (up to 4- to 5-fold) in humic adsorption with CaCl2 concentration.

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