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Published online 5 July 2005
Published in J Environ Qual 34:1372-1379 (2005)
DOI: 10.2134/jeq2004.0290
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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TECHNICAL REPORTS

Vadose Zone Processes and Chemical Transport

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

Francis X. M. Caseya,*, Jirí Simunekb, Jaehoon Leec, Gerald L. Larsend and Heldur Hakkd

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

* Corresponding author (francis.casey{at}ndsu.edu)

Received for publication July 26, 2004. Potent estrogenic hormones are consistently detected in the environment at low concentration, yet these chemicals are strongly sorbed to soil and are labile. The objective of this research was to improve the understanding of the processes of sorption, mobility, and transformation for estrogens in natural soils, and their interaction. Equilibrium and kinetic batch sorption experiments, and a long-term column study were used to study the fate and transport of 17ß-estradiol and its primary metabolite, estrone, in natural soil. Kinetic and equilibrium batch experiments were done using radiolabeled 17ß-estradiol and estrone. At the concentrations used, it appeared that equilibrium sorption for both estrogens was achieved between 5 and 24 h, and that the equilibrium sorption isotherms were linear. The log Koc values for 17ß-estradiol (2.94) and estrone (2.99) were consistent with previously reported values. Additionally, it was found that there was rate-limited sorption for both 17ß-estradiol (0.178 h–1) and estrone (0.210 h–1). An approximately 42 h long, steady-flow, saturated column experiment was used to study the transport of radiolabeled 17ß-estradiol, which was applied in a 5.00 mg L–1 solution pulse for 44 pore volumes. 17ß-estradiol and estrone were the predominant compounds detected in the effluent. The effluent breakthrough curves were asymmetric and the transport modeling indicated that sorption was rate-limited. Sorption rates and distributions of the estrogens were in agreement between column and batch experiments. This research can provide a better link between the laboratory results and observations in the natural environment.

Abbreviations: ASE, accelerated solvent extractor • CI, confidence interval • LCMS, liquid chromatography/mass spectrometer • SSQ, sum-of-squares error • TLC, thin-layer chromatography




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Vadose Zone Journal
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