Dissipation and transformation of 17¦Â-estradiol-17-sulfate in soil-water systems

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• 作者：Xuelian Bai ; Francis X.M. Casey ; Heldur Hakk ; Thomas M. DeSutter ; Peter G. Oduor ; Eakalak Khan
• 关键词：17¦Â-Estradiol ; 17¦Â-Estradiol-17-sulfate ; Estrogen ; Estrogen conjugate ; Hydroxylation ; Deconjugation
• 刊名：Journal of Hazardous Materials
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：260
• 期：Complete
• 页码：733-739
• 全文大小：794 K

文摘

In the environment, estrogen conjugates can be precursors to the endocrine-disrupting free estrogens, 17¦Â-estradiol (E2) and estrone (E1). Compared to other estrogen conjugates, 17¦Â-estradiol-17-sulfate (E2-17S) is detected at relatively high concentrations and frequencies in animal manure and surface runoff from fields receiving manure. To elucidate the lifecycle of manure-borne estrogens and their conjugates in the environment, the fate of radiolabelled E2-17S in agricultural soils was investigated using laboratory batch studies with soils of different organic carbon (OC) content (1.29 % for topsoil versus 0.26 % for subsoil). E2-17S was found relatively persistent in the aqueous phase throughout the duration of the 14 d experiment. The aqueous E2-17S persisted longer in the subsoil (half-lives (DT₅₀) = 64-173 h) than the topsoil (DT₅₀ = 4.9-26 h), and the aqueous persistence of E2-17S depended on its initial concentration. The major transformation pathway was hydroxylation, yielding mono- and di-hydroxy-E2-17S (OH-E2-17S and diOH-E2-17S). Free estrogens, E2 and E1, were only observed in the sorbed phase of the soil at low concentrations (¡«1 % of applied dose), which demonstrated that deconjugation and subsequent oxidation had occurred. Although deconjugation was not a major pathway, E2-17S could be a precursor of free estrogens in the environment.