Fate and Transport of 17-Estradiol in Soil-Water Systems

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• 作者：Francis X. M. Casey ; Gerald L. Larsen ; Heldur Hakk ; and Ji//pubs.acs.org/images/entities/rcaron.gif" border="0">í ; //pubs.acs.org/images/entities/Scaron.gif" border
• 刊名：Environmental Science & Technology
• 出版年：2003
• 出版时间：June 1, 2003
• 年：2003
• 卷：37
• 期：11
• 页码：2400 - 2409
• 全文大小：234K
• 年卷期：v.37,no.11(June 1, 2003)
• ISSN：1520-5851

文摘

Over the past several years, there has been an increasein concern regarding reproductive hormones in theenvironment. To date, there exists limited research on thefate and transport of these chemicals in the environment.In this study, a series of laboratory batch sorption and miscible-displacement experiments were done using radiolabeled[¹⁴C]17-estradiol. The 17-estradiol concentrations that wereused were similar to those found in manures that areapplied to field soils. Equilibrium batch experiments indicatedhigh sorption affinity with correlations to mineral particlesize and organic matter content. The sorption affinity appearedto be associated with the surface area and/or the cation-exchange capacity of the soil. The miscible-displacementbreakthrough curves indicated chemical nonequilibriumtransport, and a single highly polar metabolite was presentin the column effluent along with sporadic and tracedetections of estriol. Sorbed to the soil within the columnwere found 17-estradiol, estrone, and trace and sporadicdetections of estriol. Two chemical nonequilibrium, miscible-displacement models were used to describe the columnbreakthrough curves; one without transformations and theother with transformations. Both models resulted inexcellent descriptions of the data, which indicated nonuniquesolutions and less confidence in the parameter estimates.Nonetheless, the modeling and experimental resultsimplied that degradation/transformation occurred in thesorbed phase and was rapid. Also, both models indicatedthat sorption was fully kinetic.