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Mechanisms and Factors Affecting Sorption of Microcystins onto Natural Sediments

机译：微囊藻毒素对天然沉积物的吸附机理及影响因素

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摘要

The sorption of microcystins (MCs) to fifteen lake sediments and four clay minerals was studied as a function of sediment/clay properties, temperature, and pH through well-controlled batch sorption experiments. AH sorption data for both sediments and clays are well described by a nonlinear Freundlich model (ttf varies between 0.49 and 1.03). The sorption process for MCs exhibited different adsorptive mechanisms in different lake sediments mainly dependent on the sediment organic matter (OM). For sediments with lower OM (i.e., less than 8%), the sorption of MCs decreases with increasing OM and is dominated by the competition for adsorption sites between MCs and OM. In contrast, MC sorption to organic-rich (i.e., more than 8%) sediments increases with increasing OM and is dominated by the interaction between MCs and adsorbed OM. The sorption thermodynamics of MCs onto sediments showed that MC sorption is a spontaneous physisorption process with two different mechanisms. One mechanism is an exothermic process for sediment with lower OM, and the other is an endothermic process for sediment with higher OM. Furthermore, the sorption of MCs onto sediments is pH dependent (sorption decreased with increasing pH). These results provide valuable informations for a better understanding of the natural abiotic attenuation mechanisms for MCs in aquatic ecosystems.
机译：通过良好控制的分批吸附实验，研究了微囊藻毒素（MCs）在15个湖泊沉积物和4种粘土矿物上的吸附与沉积物/粘土性质，温度和pH的关系。非线性弗氏模型很好地描述了沉积物和粘土的AH吸附数据（ttf在0.49和1.03之间变化）。 MCs在不同湖泊沉积物中的吸附机理不同，主要取决于沉积物有机质（OM）。对于具有较低OM（即小于8％）的沉积物，MC的吸附随OM的增加而降低，并且以MC和OM之间的吸附位竞争为主导。相反，MC随富含OM的增加而吸附到富含有机物（即大于8％）的沉积物上，并以MC与吸附的OM之间的相互作用为主导。 MCs在沉积物上的吸附热力学表明，MCs吸附是一种自发的物理吸附过程，具有两种不同的机理。一种机理是OM较低的沉积物的放热过程，另一种机理是OM较高的沉积物的吸热过程。此外，MCs在沉积物上的吸附与pH有关（吸附随pH的增加而降低）。这些结果为更好地了解水生生态系统中MC的天然非生物衰减机制提供了有价值的信息。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2641-2647|共7页
  • 作者

    Xingqiang Wu; Bangding Xiao; Renhui Li; Chunbo Wang; Jiantuan Huang; Zhi Wang;

  • 作者单位

    Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China,Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China;

    Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;

    Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;

    Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China,Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;

    Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China,Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;

    Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China,Graduate School of the Chinese Academy of Sciences, Beijing 100039, 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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