This work studied the sorption of phytoestrogens (estrogenic compounds produced by legumes and other plants) to sediments, clays, and iron oxides. Sorption edges and isotherms for genistein, daidzein, and biochanin A on montmorillonite, kaolinite, goethite, Ottawa sand, and natural sediments were constructed. For sorption edges, the pH was varied from 4 to 12 and the ionic strength was varied from 10 mM to 510 mM, using either sodium chloride or calcium chloride. Preliminary data suggest that sorption may be an important removal mechanism for phytoestrogens in natural systems, with KD values up to 750 L kg-1 for the clays. For goethite, a strong pH dependence on the equilibrium constant is observed. These results suggest phytoestrogen sorption warrants further investigation.

Sorption of phytoestrogens to naturally-occurring solid materials

244th National Meeting (2012)

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