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A study on natural and synthetic humic acids and their complexing ability towards cadmium

机译：天然和合成腐殖酸及其对镉的络合能力研究

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摘要

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.
机译：天然和合成腐殖酸的特征在于电位滴定法，粘度和表面张力测量以及可见光谱。结果与这些酸的卷曲-开卷行为和脂族-芳族平衡相关。用离子交换法评价了这些腐殖酸与Cd2 +离子在水相中形成的配合物的稳定常数。结果倾向于表明，腐殖酚-OH基团参与了Cd2 +-腐殖酸配合物的形成，从而使其具有类似于金属-肟配合物的稳定性。合成腐殖酸的疏水部分也可能在Cd2 +离子周围提供笼型构象，从而使Cd2 +-腐殖酸复合物具有所需的稳定性。

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