Biotransformation of 17α- and 17β-estradiol in aerobic soils

► Degradation rates appear to be the same for 17α- and 17β-estradiol in aerobic soils. ► Estrone is the primary metabolite formed from both isomers. ► Biotransformation is primary mechanism of oxidation. ► E2 residuals may persist longer than predicted assuming first order degradation.