Degradation of Estrogenic Hormones in a Silt Loam Soil

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• 作者：Richeng Xuan ; Alma A. Blassengale ; Qiquan Wang
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2008
• 出版时间：October 8, 2008
• 年：2008
• 卷：56
• 期：19
• 页码：9152-9158
• 全文大小：218K
• 年卷期：v.56,no.19(October 8, 2008)
• ISSN：1520-5118

文摘

Estrogenic hormones are endocrine-disrupting compounds, which disrupt the endocrine system function of animals and humans by mimicking and/or antagonizing endogenous hormones. With the application of sludge biosolid and animal manure as alternative fertilizers in agricultural lands, estrogens enter the soil and become an environmental concern. The degradation kinetics of 17β-estradiol, an estrogenic hormone of major concern, in a silt loam soil were investigated in this study. It was found that 17β-estradiol degraded rapidly in nonsterilized soil with a half-life of 0.17 day. The degradation rate constant was proportional to the percentage of nonsterilized soil, indicating that microorganisms are directly responsible for the rapid degradation of 17β-estradiol in soil. The half-life of 17β-estradiol in 20% nonsterilized soil was slightly shortened from 1.3 to 0.69 day with the increase of soil moisture from 10 to 20% and was greatly decreased from 4.9 to 0.92 day with the increase of temperature from 15 to 25 °C. The coexistence of 40 μmol kg⁻¹ sulfadimethoxine, a veterinary antibiotic, decreased the degradation rate constant of 17β-estradiol from 0.750 ± 0.038 to 0.492 ± 0.016 day⁻¹. The degradation kinetics of another three estrogenic hormones, including 17α-estradiol, estrone, and estriol, were also investigated and compared. Estrone was identified as a degradation product of 17β-estradiol and the most persistent hormone among the four investigated estrogens. Estriol was observed in the degradation of estrone and 17α-estradiol.