Interaction of lindane with laurentian fulvic acid: A complexation model

Abstract A GC‐ultrafiltration method has been used for quantitative measurements of the extent of binding between a nonpolar insecticide lindane and a stoichiometrically well characterized fulvic acid (FA). The small (∼1 μMoleg‐1 of FA) and limited binding capacity observed favours a definite binding site model, which is related to the protonation of carboxylate groups. The stoichiometric binding capacity is a function of ionic strength and FA concentration in ways suggesting that hydrophobic sites are created by conformational equilibria of the FA polyelectrolyte.

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