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首页> 外文期刊>Environmental Science & Technology >Infiltration Behavior of Microplastic Particles with Different Densities, Sizes, and Shapes-From Glass Spheres to Natural Sediments
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Infiltration Behavior of Microplastic Particles with Different Densities, Sizes, and Shapes-From Glass Spheres to Natural Sediments

机译：具有不同密度，尺寸和形状的微塑性颗粒的渗透行为 - 来自玻璃球体到天然沉积物

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摘要

In this study, the infiltration behavior of 21 microplastic particles with different densities, diameters, and shapes was investigated using columns of glass spheres with different grain diameters. The glass spheres were considered as an analogy for natural sediment and the results were afterward transferred to natural sediment and compared to fine sediment infiltration. The infiltration depth of the microplastic particles increased with decreasing diameter of the microplastic particles (d_(MP)) and with increasing diameter of the glass spheres (d_(GS)). At ratios of d_(MP)/d_(GS) ＞ 0.32, hardly any infiltration could be observed. In regard to the particle shape, the data shows that spherical particles infiltrate deeper than fragments and fibers. In case of fibers, the fiber diameter, in particular, influences the depth of infiltration, with thinner fiber diameters leading to deeper infiltration depths. Fragments, such as tire abrasion, infiltrated less deeply than spherical particles, probably due to the entanglement of the angular particles in the pores. Finally, based on the experiments, this study provides initial indications of reasonable sampling depths in dependence of the grain sizes of the bottom sediment and the microplastic particles. According to this, microplastics in detectable particle sizes (＞100 μm) are only found on the surface of sediment consisting of coarse silt and fine sand, while the particles might infiltrate up to 13 cm into sediment consisting of coarse sand, fine gravel, and medium gravel. A statement of depth-variable microplastic concentrations is therefore mainly useful for these sediment types. Accordingly, in future sediment samples, the grain size distribution of the sediment should always be indicated to better evaluate the detected microplastic concentrations.
机译：在该研究中，使用具有不同粒径的玻璃球的柱研究了21个具有不同密度，直径和形状的微压颗粒的渗透行为。玻璃球被认为是对天然沉积物的类比，结果后方转移到天然沉积物并与细沉积物渗透相比。微塑料颗粒的渗透深度随着微塑料颗粒（D_（MP））的直径而增加，并且随着玻璃球的增加而增加（D_（GS））。在D_（MP）/ D_（GS）> 0.32的比率下，几乎可以观察到任何渗透。关于颗粒形状，数据显示球形颗粒渗透比片段和纤维更深。在纤维的情况下，纤维直径，特别是影响渗透深度，纤维直径较薄，导致更深的渗透深度。片段，例如轮胎磨损，比球形颗粒深度渗透，可能是由于角粒子在孔中的缠结。最后，基于实验，本研究提供了合理采样深度的初始指示，其依赖于底部沉积物和微塑料颗粒的晶粒尺寸。据此，可检测颗粒尺寸（>100μm）的微塑料仅在沉积物表面上发现，该沉积物由粗淤泥和细砂组成，而颗粒可能渗透到高达13厘米的沉积物中，由粗砂，细砂砾和细中型砾石。因此，深度可变微塑料浓度的陈述主要适用于这些沉积物类型。因此，在未来的沉积物样本中，应始终表明沉积物的粒度分布以更好地评估检测到的微压浓度。

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  • 来源
    《Environmental Science & Technology》 |2020年第15期|9366-9373|共8页
  • 作者

    Kryss Waldschlaeger; Holger Schuettrumpf;

  • 作者单位

    Institute of Hydraulic Engineering and Water Resources Management RWTH Aachen University 52056 Aachen Germany;

    Institute of Hydraulic Engineering and Water Resources Management RWTH Aachen University 52056 Aachen Germany;

  • 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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