Humic Acid Complexation of Calcium and Copper

Janet G. Herlng, Francois M. M. Morel

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204 Scopus citations


High-affinity metal binding by isolated humic acids has been observed for both copper and calcium in metal titration experiments. Results of titrationsof humicacids with a single metal (either calcium or copper) are consistent with a discrete ligand site model of humate-metal binding. However, copper titrations in thepresence of excess calcium do not show competitive effects predicted by such a model. Hence, different ligand sites mustbe involved in calcium and copper binding, or a binding mechanism other than discrete ligand binding must be operative.

Original languageEnglish (US)
Pages (from-to)1234-1237
Number of pages4
JournalEnvironmental Science and Technology
Issue number10
StatePublished - Oct 1 1988

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry


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