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

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Abstract:

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: CALCIUM; KAOLINITE; NATURAL ORGANIC MATTER; SORPTION

Document Type: Research Article

DOI: https://doi.org/10.1180/0009855033840107

Publication date: 2003-12-01

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