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首页> 外文期刊>Environmental Science & Technology >Quantifying Bioavailability of Pyrene Associated with Dissolved Organic Matter of Various Molecular Weights to Daphnia magna
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Quantifying Bioavailability of Pyrene Associated with Dissolved Organic Matter of Various Molecular Weights to Daphnia magna

机译：Da与各种分子量的溶解有机物相关的oci的生物利用度的定量研究

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摘要

src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b05520/20180111/images/medium/es-2017-05520c_0006.gif">Dissolved organic matter (DOM) is a key environmental factor for the bioavailability of hydrophobic organic compounds (HOCs) in natural waters. However, the bioavailability of DOM-associated HOCs is not clear. In this research, pyrene was selected as a model HOC, and its freely dissolved concentration (Cfree) was maintained by passive dosing systems. The immobilization and pyrene content in the tissues excluding gut of Daphnia magna were examined to quantify the bioavailability of DOM-associated pyrene. The results indicated that DOM promoted the bioavailability of pyrene when the Cfree of pyrene was kept constant, and the bioavailability of pyrene associated with DOM of various molecular weights was ordered as middle molecular weight (5 000–10 000 Da) DOM > lower molecular weight (<1 000, 1 000–3 000, and 3 000–5 000 Da) DOM > higher molecular weight (>10 000 Da) DOM. The influencing mechanisms of DOM molecular weight were related with the partition of pyrene between DOM and water, the uptake routes of DOM by D. magna, and the desorption or release of pyrene from DOM in the gut of D. magna. The findings obtained in this research suggest that the bioavailability of DOM-associated HOCs should be taken into account for the eco-environmental risk assessment of HOCs in water systems.
机译：src =“ http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b05520/20180111/images/medium /es-2017-05520c_0006.gif“>溶解的有机物（DOM）是天然水中疏水性有机化合物（HOC）生物利用度的关键环境因素。但是，尚不清楚与DOM相关的HOC的生物利用度。在这项研究中，选择pyr作为模型HOC，并通过被动加料系统保持其自由溶解浓度​​（ C free ）。检查了除水蚤以外的组织中固定化和i的含量，以量化与DOM相关的quant的生物利用度。结果表明，保持the的 C 不变，DOM促进了the的生物利用度，而与不同分子量的DOM相关的pyr的生物利用度被排序为中间分子量（5 000–10 000 Da）DOM>较低分子量（<1 000、1 000–3 000和3 000-5 000 Da）DOM>较高分子量（> 10 000 Da）。 DOM分子量的影响机理与pyr在DOM与水之间的分配，D吸收DOM的途径有关。并在 D的肠道中从DOM解吸或释放of。 magna 。这项研究中获得的发现表明，与DOM相关的HOC的生物利用度应考虑到水系统中HOC的生态环境风险评估中。

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  • 来源
    《Environmental Science & Technology》 |2018年第2期|644-653|共10页
  • 作者

    Hui Lin; Xinghui Xia; Siqi Bi; Xiaoman Jiang; Haotian Wang; Yawei Zhai; Wu Wen;

  • 作者单位

    School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China;

    School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China;

    School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China;

    School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China;

    School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China;

    School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China;

    School of Environment, Beijing Normal University, State Key Laboratory of Water Environment Simulation, Beijing 100875, China;

  • 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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