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Clay Minerals; December 2003; v. 38; no. 4; p. 433-443; DOI: 10.1180/0009855033840107
© 2003 Mineralogical Society of Great Britain and Ireland
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Research Paper

Adsorption of humic acid onto a kaolinitic clay studied by high-resolution argon adsorption volumetry

A. SAADA1,*, H. GABORIAU1, S. CORNU2, F. BARDOT1, F. VILLIÉRAS3 and J. P. CROUÉ4

1 Bureau de Recherches Géologiques et Minières (BRGM), Environnement & Procédés, 3, avenue Claude Guillemin, BP 6009, 45060 Orléans Cedex 2, 2 Unité de Science du sol, INRA d’Orléans, Avenue de la pomme de pin, BP 20619, 45166 Olivet Cedex, 3 Laboratoire Environnement et Minéralurgie, UMR 7569 INPL & CNRS, ENSG - BP 40 - 54501 Vandoeuvre-les-Nancy Cedex, and 4 Laboratoire de Chimie de l’Eau et de l’Environnement, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France

* E-mail: a.saada{at}brgm.fr

(Received 18 March 2002; revised 5 May 2003)

The mechanisms governing the adsorption of a commercial humic acid (HA) on a kaolinitic clay were determined. The amount of HA fixed increased with the ionic strength of the medium and the presence of divalent ions (Ca2+). The effect of Ca2+ is due to its ability to establish (1) intramolecular bridges causing condensation of the HA, and (2) intermolecular bridges between the clay and the HA. A stable clay-humic complex containing only the fraction of HA that withstands washing with water was prepared and characterized by high-resolution Ar adsorption volumetry. The overall results show that (1) HA interacts strongly with the basal surfaces of the clay, (2) Ca serves to establish Ca2+ bridges between HA and clay, and (3) HA and clay interact via at least two distinct adsorption mechanisms.

KEYWORDS: kaolinite, natural organic matter, sorption, calcium






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