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首页> 外文期刊>Environmental Science & Technology >Kinetics of PCB Microbial Dechlorination Explained by Freely Dissolved Concentration in Sediment Microcosms
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Kinetics of PCB Microbial Dechlorination Explained by Freely Dissolved Concentration in Sediment Microcosms

机译：PCB微生物脱氯的动力学通过沉积物微观自由溶解浓度​​解释

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摘要

While microbial dechlorination of polychlorinated biphenyls (PCBs) has been observed in sediments over the last 3 decades, translation to the field has been difficult due to a lack of a clear understanding of the kinetic limitations. To address this issue, the present study used passive dosing/sampling to accurately measure the biological rate of dechlorination of 2,3,4,5-tetrachlorobiphenyl (PCB 61) to 2,3,5-trichlorobiphenyl (PCB 23) by an organohalide-respiring bacterium, Dehalobium chlorocoercia (DF-1). The biological rates were measured over an environmentally relevant concentration range of 1-50 ng/L of freely dissolved concentrations with and without the presence of sediment in bench-scale microcosm studies. The rate of dechlorination was found to be linearly dependent on the freely dissolved concentration of PCB 61 both in sediment and in sediment- free microcosms. The observed rate of dechlorination in sediment microcosms could be predicted within a factor of 2 based on the kinetics measured in sediment-free microcosms. A threshold for dechlorination was not observed down to an aqueous concentration of about 1 ng/L PCB 61. We demonstrate that with the combination of an accurate measurement of the aqueous-phase dechlorination kinetics and an understanding of the site-specific partitioning characteristics, it is possible to predict PCB microbial dechlorination in sediments.
机译：在过去的3年内，在沉积物中观察到多氯化双苯基（PCB）的微生物脱氯，因此由于对动力学限制缺乏了解，对该领域的翻译是困难的。为了解决这个问题，本研究采用被动计量/取样来精确地测量2,3,4,5-四氯己烯（PCB 61）至2,3,5-三氯基苯（PCB 23）的生物学率通过有机卤代物 - 裂解细菌，氯联合脱卤（DF-1）。在具有沉积物中的1-50ng / L自由溶解浓度​​的环境相关浓度范围内测量生物速率，并且在长凳级微观研究中存在沉积物。发现脱氯率线性地取决于沉积物和无沉积物的微观沉积物中的PCB 61的自由溶解浓度​​。在基于在无沉积物微观中测量的动力学，沉积物微观液体中观察到的沉积物微观脱氯率可以预测。脱氯的阈值未观察到约1ng / L pCB 61的含水浓度。我们表明，随着水相脱氯动力学的准确测量和理解特异性分区特征的组合，它可以预测沉积物中的PCB微生物脱氯。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7432-7441|共10页
  • 作者

    Needham Trevor P.; Payne Rayford B.; Sowers Kevin R.; Ghosh Upal;

  • 作者单位

    Univ Maryland Baltimore Cty Inst Marine & Environm Technol Dept Chem Biochem & Environm Engn Baltimore MD 21202 USA;

    Univ Maryland Baltimore Cty Inst Marine & Environm Technol Dept Marine Biotechnol Baltimore MD 21202 USA;

    Univ Maryland Baltimore Cty Inst Marine & Environm Technol Dept Marine Biotechnol Baltimore MD 21202 USA;

    Univ Maryland Baltimore Cty Inst Marine & Environm Technol Dept Chem Biochem & Environm Engn Baltimore MD 21202 USA;

  • 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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