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首页> 外文期刊>Environmental Science & Technology >Accumulation of HOCs via Precontaminated Microplastics by Earthworm Eisenia fetida in Soil
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Accumulation of HOCs via Precontaminated Microplastics by Earthworm Eisenia fetida in Soil

机译：土壤蚯蚓艾西比亚籽虫微塑料通过预键聚微塑料积累Hocs

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摘要

Soil is a primary sink for plastics, but the influence of microplastics as carriers on terrestrial cycling of persistent contaminants is poorly understood as compared to aquatic systems. Studies to date have disregarded the potential fact that microplastics are generally contaminated before their entry into soil. In this study, earthworm Eisenia fetida was incubated for 28 d in a soil amended with five common types of microplastics precontaminated with poly chlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) to elucidate contaminant transfer. Accumulation of HOCs in E. fetida varied greatly among different plastic types and HOCs. The freely dissolved concentration (C_(free)) of HOCs showed that desorption of HOCs from microplastics into soil was closely related to plastic types and HOC hydrophobicity and was much slower for polystyrene or polypropylene than polyethylene. Biodynamic model analysis suggested that ingestion of microplastics could act as a significant pathway for some microplastics, likely due to HOCs on the plastics being in an "over-equilibrium" state. This was in contrast with mixing clean microplastics into HOC-contaminated soil, where the microplastics decreased bioaccumulation. Therefore, whether microplastics serve as facilitators or inhibitors of HOC bioaccumulation depends on the fugacity gradient of HOCs between microplastics and soil, which highlights the importance of considering the sequence of contamination between the plastics and soil. These findings also question the validity of short-term experiments because of the generally very slow partition kinetics of HOCs on plastics.
机译：土壤是塑料的初级水槽，但与水生系统相比，微塑料作为持续污染物陆地循环对陆地循环的载体的影响很差。迄今为止的研究已经忽视了潜在的事实，即微薄塑料在进入土壤之前通常被污染。在本研究中，用5种常用类型的微细芳烃（PAHS）普选的土壤中孵育28d，将蚯蚓Eisenia Fetida温育28d，以阐明含有聚氯化联苯（PCB）和多环芳烃（PAH）以阐明污染物转移。在E. fetida中的Hocs积累在不同的塑料类型和Hoc中变化大。 Hocs的自由溶解的浓度（C_（自由））表明，从微薄到土壤中的Hocs解吸与塑料类型和Hoc疏水性密切相关，并且对于聚苯乙烯或聚丙烯比聚乙烯更慢。生物动力学模型分析表明，摄入微薄塑料可以作为一些微塑料的显着途径，可能由于塑料上的HOC是“过度平衡”状态的影响。这与将清洁微塑料混合到Hoc污染的土壤中相反，微塑料的生物累积减少。因此，微塑料塑料是否用作hoc生物累积的促进剂或抑制剂取决于微薄和土壤之间Hocs的抗脱裂性梯度，这凸显了考虑塑料和土壤之间污染序列的重要性。这些发现还质疑短期实验的有效性，因为Hocs对塑料的一般缓慢分区动力学。

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  • 来源
    《Environmental Science & Technology》 |2020年第18期|11220-11229|共10页
  • 作者

    Jie Wang; Scott Coffin; Daniel Schlenk; Jay Gan;

  • 作者单位

    Department of Environmental Sciences University of California Riverside California 92521 United States Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation College of Resources and Environmental Sciences China Agricultural University Beijing 100193 China;

    Department of Environmental Sciences University nf California Riverside California 92521 United States;

    Department of Environmental Sciences University of California Riverside California 92521 United States;

    Department of Environmental Sciences University of California Riverside California 92521 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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