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首页> 外文期刊>Environmental Science & Technology >Factors Controlling the Distribution of Microplastic Particles in Benthic Sediment of the Thames River, Canada
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Factors Controlling the Distribution of Microplastic Particles in Benthic Sediment of the Thames River, Canada

机译：控制加拿大泰晤士河底栖沉积物中微细颗粒物分布的因素

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摘要

Investigations of microplastic abundances in freshwater environments have become more common in the past five years, but few studies concern the factors that control the distribution of microplastics in river systems. We sampled benthic sediment from 34 stations along the Thames River in Ontario, Canada, to determine the influence of land use, grain size, river morphology, and relative amount of organic debris on the distribution of microplastics. Once counted and characterized for shape, color, and size, microplastic abundances were normalized to the results from Fourier transform infrared spectroscopy on randomly selected particles. The results indicate that 78% of the fragments and only 33% of the fibers analyzed were plastic. The normalized microplastic quantities ranged from 6 to 2444 particles per kg of dry weight sediment (kg~(-1) dw). The greatest number of microplastics were identified in samples of the finest grain sizes and with the greatest amount of organic debris. Although there was no significant difference between microplastic abundances in urban versus rural locations, the average microplastic count for urban samples was greater (269 vs 19S kg~(-1) dw). In terms of river morphology, samples from along straight courses of the river contained fewer microplastics than samples from inner and outer bends. Overall abundances confirm how rivers contain a significant number of plastic particles and thus may be major conduits of microplastics to lake and ocean basins.
机译：在过去的五年中，对淡水环境中微塑性丰度的研究变得越来越普遍，但是很少有研究涉及控制河流系统中微塑性分布的因素。我们对加拿大安大略省泰晤士河沿岸34个站点的底栖沉积物进行了采样，以确定土地利用，粒度，河流形态以及有机碎片的相对数量对微塑料分布的影响。一旦对形状，颜色和大小进行了计数和特征化，就将微塑性丰度根据随机选择的粒子的傅里叶变换红外光谱法的结果进行归一化。结果表明，分析的78％的碎片和仅33％的纤维是塑料。每千克干重沉积物（kg〜（-1）dw）的归一化微塑性量范围为6至2444个颗粒。在具有最细粒度和最大有机碎片的样品中，发现了数量最多的微塑料。尽管城市和农村地区的微塑性丰度之间没有显着差异，但城市样品的平均微塑性数却更高（269 vs 19S kg〜（-1）dw）。就河流形态而言，沿河笔直河段采集的样品中含有的微塑料少于内弯和外弯样品。总体丰度证实了河流中如何包含大量的塑料颗粒，因此可能是微塑料通往湖泊和海洋盆地的主要管道。

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    《Environmental Science & Technology》 |2020年第2期|818-825|共8页
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    University of Western Ontario London Canada;

    University of Western Ontario London;

    University of Western Ontario London. Canada;

  • 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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  • 正文语种 eng
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