Upper Midwest Water Science Center, U.S. Geological Survey, 8505 Research Way, Middleton, Wisconsin 53562, United States.
Department of Chemistry and Biochemistry, State University of New York at Fredonia, 280 Central Avenue, Science Complex 340, Fredonia, New York 14063, United States.
Environ Sci Technol. 2021 Jan 5;55(1):373-384. doi: 10.1021/acs.est.0c06087. Epub 2020 Dec 7.
The spatial distribution, concentration, particle size, and polymer compositions of microplastics in Lake Michigan and Lake Erie sediment were investigated. Fibers/lines were the most abundant of the five particle types characterized. Microplastic particles were observed in all samples with mean concentrations for particles greater than 0.355 mm of 65.2 p kg in Lake Michigan samples ( = 20) and 431 p kg in Lake Erie samples ( = 12). Additional analysis of particles with size 0.1250-0.3549 mm in Lake Erie resulted in a mean concentration of 631 p kg. The majority of polymers in Lake Michigan samples were poly(ethylene terephthalate) (PET), high-density polyethylene (HDPE), and semisynthetic cellulose (S.S. Cellulose), and in Lake Erie samples were S.S. Cellulose, polypropylene (PP), and poly(vinyl chloride) (PVC). Polymer density estimates indicated that 85 and 74% of observed microplastic particles have a density greater than 1.1 g cm for Lake Michigan and Lake Erie, respectively. The current study provided a multidimensional dataset on the spatial distribution of microplastics in benthic sediment from Lake Michigan and Lake Erie and valuable information for assessment of the fate of microplastics in the Great Lakes.
研究了密歇根湖和伊利湖沉积物中微塑料的空间分布、浓度、粒径和聚合物组成。在所描述的五种颗粒类型中，纤维/线是最丰富的。在所有样品中都观察到了微塑料颗粒，密歇根湖样品中大于 0.355 毫米的颗粒平均浓度为 65.2 p kg（ = 20），伊利湖样品中为 431 p kg（ = 12）。对伊利湖 0.1250-0.3549 毫米大小的颗粒进行进一步分析，得到的平均浓度为 631 p kg。密歇根湖样品中的大多数聚合物为聚对苯二甲酸乙二醇酯（PET）、高密度聚乙烯（HDPE）和半合成纤维素（S.S. 纤维素），而伊利湖样品中的聚合物为 S.S. 纤维素、聚丙烯（PP）和聚氯乙烯（PVC）。聚合物密度估计表明，对于密歇根湖和伊利湖，85%和 74%的观察到的微塑料颗粒的密度大于 1.1 g cm。本研究提供了关于密歇根湖和伊利湖底栖沉积物中微塑料空间分布的多维数据集，为评估大湖微塑料的命运提供了有价值的信息。
