The natural and synthetic humic acids were characterised by potentiometric titrations, viscosity and surface tension measurements, as well as visible spectometry The results have been correlated with coiling-decoiling behaviour and aliphatic–aromatic balance of these acids. The stability constant of complexes formed by these humic acids with Cd2+ ions in aqueous phase was evaluated by the ion-exchange method. Results tend to suggest that humic phenolic –OH group was involved in the formation of Cd2+–humic complex, leading to it the given stability in a manner as for the analogous metal–oxine complexation. The hydrophobic moiety of the synthetic humic acid may also provide a cage-type conformation around Cd2+ ion, imparting to the Cd2+–humic complex the desired stability.
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Datta, A., Sanyal, S. & Saha, S. A study on natural and synthetic humic acids and their complexing ability towards cadmium. Plant and Soil 235, 115–125 (2001). https://doi.org/10.1023/A:1011842019753