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首页> 外文期刊>Environmental Science & Technology >Fate of Endogenous Steroid Hormones in Steer Feedlots Under Simulated Rainfall-Induced Runoff
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Fate of Endogenous Steroid Hormones in Steer Feedlots Under Simulated Rainfall-Induced Runoff

机译：模拟降雨诱发径流条件下Feed牛育肥场中内源性类固醇激素的命运

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摘要

Steroid hormones pose potential risks to fish and other aquatic organisms at extremely low concentrations. To assess the factors affecting the release of endogenous estrogenic and androgenic steroids from feedlots during rainfall, runoff and soil samples were collected after simulated rainfall on a 14-steer feedlot under different rainfall rates and aging periods and analyzed for six steroid hormones. While only 17a-estradiol, testosterone, and progesterone were detected in fresh manure, 17β-estradiol, estrone, and androstenedione were present in the surficial soil after two weeks. In the feedlot surficial soil, concentrations of 17a-estradiol decreased by approximately 25% accompanied by an equivalent increase in estrone and 17β-estradiol. Aging of the feedlot soils for an additional 7 days had no effect on estrogen and testosterone concentrations, but androstenedione concentrations decreased substantially, and progesterone concentrations increased. Androstenedione and progesterone concentrations in the surficial soil were much higher than could be accounted for by excretion or conversion from testosterone, suggesting that other potential precursors, such as sterols, were converted after excretion. The concentration of androgens and progesterone in the soil were approximately 85% lower after simulated rainfall, but the estrogen concentrations remained approximately constant. The decreased masses could not be accounted for by runoff, suggesting the possibility of rapid microbial transformation upon wetting. All six steroids in the runoff, with the exception of 17β-estradiol, were detected in both the filtered and particle-associated phases at concentrations well above thresholds for biological responses. Runoff from the aged plots contained less 17a-estradiol and testosterone, but more estrone, androstenedione, and progesterone relative to the runoff from the unaged plots, and most of the steroids had a lower particle-associated fraction.
机译：极低浓度的类固醇激素对鱼类和其他水生生物构成潜在风险。为了评估降雨期间内源性雌激素和雄激素类固醇释放的影响因素，在模拟降雨条件下，在不同降雨率和老化时期的14轮饲养场中收集径流和土壤样品，并分析六种类固醇激素。在新鲜粪便中仅检测到17a-雌二醇，睾丸激素和孕酮，两周后表层土壤中存在17β-雌二醇，雌酮和雄烯二酮。在肥育场表层土壤中，17a-雌二醇的浓度降低了约25％，同时雌酮和17β-雌二醇也相应增加。肥育场土壤再老化7天对雌激素和睾丸激素的浓度没有影响，但是雄烯二酮的浓度显着降低，而孕酮的浓度增加。表层土壤中雄烯二酮和孕酮的浓度远高于从睾丸激素排泄或转化而来的浓度，这表明其他潜在的前体，例如固醇，在排泄后转化。模拟降雨后，土壤中雄激素和孕酮的浓度降低了约85％，但雌激素的浓度保持约恒定。减少的质量不能由径流解释，这表明润湿后微生物快速转化的可能性。除17β-雌二醇外，径流中所有六种类固醇的浓度都远高于生物反应阈值，在过滤相和颗粒相关相中均被检测到。与未老化田地的径流相比，老化田地的径流含有较少的17a-雌二醇和睾丸激素，但雌酮，雄烯二酮和孕酮的含量更高，并且大多数类固醇的颗粒相关分数较低。

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  • 来源
    《Environmental Science & Technology》 |2011年第20期|p.8811-8818|共8页
  • 作者

    D. Scott Mansell; Reid J. Bryson; Thomas Harter; Jackson P. Webster; Edward P. Kolodziej; David L. Sedlak;

  • 作者单位

    Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720-1710, United States;

    Department of Land, Air, and Water Resources, University of California, Davis, California 95616-8628, United States;

    Department of Land, Air, and Water Resources, University of California, Davis, California 95616-8628, United States;

    Department of Civil and Environmental Engineering, University of Nevada, Reno, Nevada 89557-0258, United States;

    Department of Civil and Environmental Engineering, University of Nevada, Reno, Nevada 89557-0258, United States;

    Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720-1710, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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