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Survey on Microplastics and Macroscopic Floating Garbage in River, Coasts, and Estuary in the Eastern Part of Takamatsu City, Japan
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Researchers surveyed microplastics and macroscopic floating litter in rivers, coasts, and estuaries in eastern Takamatsu City, Japan, finding PE and PP dominated microplastics in both river and coastal environments, and that plastic fragments, bags, and cigarette butts were the most common macro-litter items with distribution influenced by wind and wave conditions.
河川・海岸におけるマイクロプラスチックと海岸・海域におけるマクロプラスチック漂流ごみを対象として，直接採取により，それらの特徴や流出量を調べた．その結果，マイクロプラスチックでは，河川・海岸ともにPEやPPが多くみられた．また，2次粒子のMPsの粒径から元の製品の同定は難しいことが確認された．マクロ漂流ごみでは，大分類のうちプラスチックが最も多く，その内訳では袋類や破片やたばこの吸い殻が多い結果となった．また，風や波が強いと潮目が生じず，ごみの回収量もやや減少することが確認された．さらに，不法投棄や不適切な処分をされて流入したごみは，比較的短期間に海域部へと移動することが賞味期限の結果から示された．
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Characteristics of Microplastics and Macro-sized Coastal Debris on the Beaches of the Eastern Takamatsu City, Japan
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A beach survey in eastern Takamatsu, Japan found that the beach near a large urban river mouth had higher concentrations of both microplastics and macro-litter than a more remote beach, with polyethylene dominating at one site and polystyrene at the other. Most litter items were less than six months old, suggesting rapid accumulation from nearby sources rather than long-range ocean transport.
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Researchers developed a high-resolution method to map microplastic and macroplastic emissions from Japanese river catchments into the sea, using correlations between observed river concentrations and basin characteristics such as urban area ratio and population density to generate nationwide plastic emission estimates.
Rapid Sampling of Suspended and Floating Microplastics in Challenging Riverine and Coastal Water Environments in Japan
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Two newly developed compact sampling devices (Albatross Mark 5 and 6) collected microplastic samples from Japanese rivers and coastal waters in just 3 minutes compared to 10-60 minutes with conventional nets, while producing comparable concentration measurements. Polyethylene and polypropylene dominated, and particles became smaller from riverine to coastal environments.
Microplastic abundance in the semi-enclosed Osaka Bay, Japan
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Researchers quantified microplastic abundance in the semi-enclosed Osaka Bay, Japan, finding elevated concentrations near river mouths and urban coastal zones, and characterizing dominant polymer types consistent with consumer plastics.
Microplastic in three urban estuaries, China
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Researchers surveyed three urban estuaries in China and found microplastics throughout, with concentrations and types reflecting the combined influence of surrounding city density, stormwater runoff, and tidal mixing.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.