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Clay Minerals; June 2003; v. 38; no. 2; p. 173-185; DOI: 10.1180/0009855033820087
© 2003 Mineralogical Society of Great Britain and Ireland
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Destabilization of montmorillonite suspensions by Ca2+ and succinoglycan

J. LABILLE1, F. THOMAS1,*, I. BIHANNIC1 and C. SANTAELLA2

1 Laboratoire Environnement et Minéralurgie - UMR 7569 CNRS-INPL, BP 40, 54501 Vandoeuvre-lès-Nancy cedex, France, and 2 CEA Cadarache DSV DEVM, Laboratoire d’Ecologie Microbienne de la Rhizosphère - UMR 163 CNRS-CEA, Université Méditerranée, 13108 Saint-Paul-lez-Durance cedex, France

* E-mail: fabien.thomas{at}ensg.inpl-nancy.fr

(Received 18 March 2002; revised 16 October 2002)

Aggregation of colloidal clay particles (Namontmorillonite) by CaCl2 and anionic polysaccharide (succinoglycan) in turbulent conditions was investigated using time-resolved size measurements by laser diffraction on diluted (50 mg l–1) and stirred suspensions. Excess of Ca2+ ions promotes coagulation of the clay, reducing interparticle repulsions, and allows adsorption of succinoglycan, inducing bridging flocculation. Growth/breakage cycles, characteristic of the turbulent conditions, cause the macromolecules to be incorporated in the innermost of the flocs, where the morphological units are shown by confocal microscopy to be the micrometric Ca-clay particles. Such incorporation results in an increased floc tensile strength, depending on the amount of macromolecules adsorbed, with a maximum at polysaccharide concentrations of 2 wt.% with respect to clay mass.

KEYWORDS: montmorillonite, polysaccharide, flocculation, laser diffraction, confocal microscopy, soil aggregation




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K. M. Dontsova and J. M. Bigham
Anionic Polysaccharide Sorption by Clay Minerals
Soil Sci. Soc. Am. J., June 2, 2005; 69(4): 1026 - 1035.
[Abstract] [Full Text] [PDF]


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