Abstract
Cobaltihexamine (CoHM) is proposed as an index cation for measuring the cation exchange capacities (CEC) of "intact" and dissolved soil humic substances. Samples containing 2 to 5 mg humic substances were sufficient for each CoHM-CEC measurement. CoHM cation exchange capacity versus pH curves were better resolved than acid base titration curves in 0.1 M NaClO4 and were slightly displaced towards lower pH values. Three adsorption maxima were obtained in the pH range 3 to 10, and these corresponded to functional group entities observed in δpH/δml curves from acid-base titration.
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© 1991 Springer-Verlag
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Maes, A., Van Elewijck, F., Vancluysen, J., Tits, J., Cremers, A. (1991). Cobaltihexamine as an index cation for measuring the cation exchange capacity of humic acids. In: Allard, B., Borén, H., Grimvall, A. (eds) Humic Substances in the Aquatic and Terrestrial Environment. Lecture Notes in Earth Sciences, vol 33. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0010460
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DOI: https://doi.org/10.1007/BFb0010460
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