Microplastic (MP) pollution is a rising environmental concern. This study investigated MP concentrations in Tokyo Bay using neuston net for surface sampling and deep-sea plankton pump for underwater sampling across six stations at multiple depths. Results revealed substantial variation in MP concentrations. Surface large microplastics (LMP, > 350 μm) ranged from 0.21 × 10−3 to 3.34 × 10−3 pieces L−1, averaging 1.26 × 10−3 pieces L−1, while surface small microplastics (SMP, 60 μm to 350 μm) were highest at head of the bay (11.5 ± 3.05 pieces L−1). SMP concentrations varied with depth and position, peaking at center of the bay (5.79 ± 1.63 pieces L−1 at 2 m). Additionally, the total amount of surface LMP was estimated at 10.3 m3 and SMP at 15.0 m3 in the Tokyo Bay. This study provides a comprehensive picture of the spatial and vertical distribution of MP in Tokyo Bay.

中文翻译：

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东京湾的微塑料量


微塑料 (MP) 污染是一个日益严重的环境问题。本研究使用诺斯顿网进行表面采样，并使用深海浮游生物泵在多个深度的六个站进行水下采样，调查了东京湾的 MP 浓度。结果显示 MP 浓度存在显着差异。表面大微塑料（LMP，> 350 μm）范围为 0.21 × 10−3 至 3.34 × 10−3 件 L−1，平均 1.26 × 10−3 件 L−1，而表面小微塑料（SMP，60 μm 至350 μm）在海湾顶部最高（11.5 ± 3.05 件 L−1）。 SMP 浓度随深度和位置而变化，在海湾中心达到峰值（2 m 处为 5.79 ± 1.63 块 L−1）。此外，东京湾表面 LMP 总量估计为 10.3 立方米，SMP 总量为 15.0 立方米。这项研究提供了东京湾 MP 空间和垂直分布的全面图景。