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TECHNICAL REPORT
Organic Compounds in the Environment

Persistence of Estrogenic Hormones in Agricultural Soils

II. 17-Ethynylestradiol

Agriculture and Agri-Food Canada, Research Branch, 1391 Sandford Street, London, ON, Canada N5V 4T3

* Corresponding author (toppe{at}em.agr.ca)

Received for publication October 16, 2000. The persistence of 17-ethynylestradiol in agricultural soil was established in laboratory microcosm studies. The hormone was rapidly dissipated in loam, sandy loam, and silt loam soils under a range of moisture and temperature conditions. Dissipation of 17-ethynylestradiol correlated closely with removal of total estrogenicity determined with a recombinant yeast bioassay, indicating that extractable estrogenic transformation products did not accumulate. The stability of 17-ethynylestradiol in sterile soil, decreased removal in the absence of oxygen, and the response of dissipation kinetics to variation in temperature and moisture suggested that the removal was microbially mediated. We conclude that 17-ethynylestradiol is rapidly dissipated in agricultural soils under a range of conditions typical of a temperate growing season.

Abbreviations: HPLC, high performance liquid chromatography • YES, yeast estrogenicity screen assay

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