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Microplastic volumes in Tokyo Bay

Marine Pollution Bulletin 2024 8 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count.
M Sato, Zijiang Yang, Yukiho Katagata, Hiroaki Hamada, Yuta Yamada, Hisayuki Arakawa

Summary

Researchers quantified microplastic volumes across multiple sites in Tokyo Bay, Japan, finding spatial variation linked to urban runoff and river inputs, with surface waters and sediments showing distinct accumulation patterns.

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 to 3.34 × 10 pieces L, averaging 1.26 × 10 pieces L, while surface small microplastics (SMP, 60 μm to 350 μm) were highest at head of the bay (11.5 ± 3.05 pieces L). SMP concentrations varied with depth and position, peaking at center of the bay (5.79 ± 1.63 pieces L at 2 m). Additionally, the total amount of surface LMP was estimated at 10.3 m and SMP at 15.0 m in the Tokyo Bay. This study provides a comprehensive picture of the spatial and vertical distribution of MP in Tokyo Bay.

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