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Sorption, Mobility, and Transformation of Estrogenic Hormones in Natural Soil

Francis X. M. Casey^a,*, Jií imnek^b, Jaehoon Lee^c, Gerald L. Larsen^d and Heldur Hakk^d

^a Dep. of Soil Science, North Dakota State Univ., Fargo, ND 58105
^b Dep. of Environ. Sciences, Univ. of California, Riverside, CA 92521
^c Dep. of Biosystems Eng. and Environ. Sciences, Univ. of Tennessee, Knoxville, TN 37996–4531
^d Animal Metabolism: Agricultural Chemicals Research, Biosciences Research Lab., USDA-ARS, Fargo, ND 58105-5674

View larger version (51K): [in a new window]   Fig. 1. Batch sorption data of sorbed vs. aqueous concentrations for (a) 17ß-estradiol and (b) estrone. Five different batch sample times are presented with their corresponding linear sorption isotherms.

View larger version (38K): [in a new window]   Fig. 2. Kinetic sorption batch data showing the aqueous concentration of (a) 17ß-estradiol and (b) estrone vs. time. The batch data shown are from the different initial aqueous concentrations, which are fit with a first-order kinetic sorption model, Eq. [1].

View larger version (22K): [in a new window]   Fig. 3. Concentrations of 17ß-estradiol and its transformation products through the depth of the soil column. Also included is the prediction using the "two-site/2" parameter estimates obtained from the effluent breakthrough curves in Table 3.

View larger version (40K): [in a new window]   Fig. 4. The soil column, relative, effluent concentrations of total 14C, 17ß-estradiol, and estrone through time. The 17ß-estradiol and estrone data were fit with (a) an instantaneous sorption model option (Table 3, Instantaneous) and (b) a two-site sorption model option (Table 3, Two-site/2).