Title: Measurement of the potentially available charge and the dissociation behavior of humic-acid from cobaltihexammine adsorption
Authors: Maes, AndrĂ© ×
Tits, J
Mermans, G
Dierckx, A #
Issue Date: 1992
Publisher: Blackwell science ltd
Series Title: Journal of soil science vol:43 issue:4 pages:669-677
Abstract: The use of a new method for characterizing humic acids based on the measurement of the cobaltihexammine cation exchange capacity (CEC) vs. pH is examined. The method was first verified on a macroporous weak-acid cation exchange resin: charge vs. pH curves and pK values from cobaltihexammine adsorption identify with results from discontinuous acid-base titrations at high ionic strength (5 m). Similar agreement was obtained for humic acids from a Podzol soil: the cobaltihexammine-CEC identifies with the macromolecular charge (from continuous acid-base titrations) at ionic strength of 3 and 5 m, but slightly underestimates (5%) the humic acid charge at 1 m ionic strength. The cobaltihexammine method is suitable for determining the potentially available charge in the pH range 2 to 12 and the intrinsic pK values of humic acids.
ISSN: 0022-4588
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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