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Carbonyl index of miniaturized microplastics at the sea surface

Marine Pollution Bulletin 2024 11 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 50 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Atsuhiko Isobe Atsuhiko Isobe Zijiang Yang, Atsuhiko Isobe Zijiang Yang, Zijiang Yang, Atsuhiko Isobe Murat Çelik, Murat Çelik, Haodong Xu, Haodong Xu, Haodong Xu, Haruka Nakano, Atsuhiko Isobe Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Atsuhiko Isobe Haruka Nakano, Atsuhiko Isobe Haruka Nakano, Atsuhiko Isobe Haruka Nakano, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Zijiang Yang, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Murat Çelik, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Hisayuki Arakawa, Haruka Nakano, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Haodong Xu, Haodong Xu, Hisayuki Arakawa, Haruka Nakano, Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Hisayuki Arakawa, Haruka Nakano, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Haruka Nakano, Haruka Nakano, Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Murat Çelik, Atsuhiko Isobe Haruka Nakano, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe

Summary

Researchers measured the carbonyl index, an indicator of degradation, in small and large microplastics collected from surface waters in Japan. They found that smaller microplastics had significantly higher carbonyl indices than larger ones, indicating more advanced degradation. The findings suggest that smaller microplastics in the ocean have been exposed to weathering processes for longer periods, providing insight into the aging and fragmentation of marine plastic debris.

Polymers
PE PP

We investigated the carbonyl index (CI) of small microplastics (SMPs; 50-350 μm) and large microplastics (LMPs; >350 μm) in the surface waters of the Tokai region and Tokyo Bay in Japan. The degradation was evaluated by determining the CI from the infrared spectrum of microplastics (MPs) adopting the specified area under the band technique. Average CIs of SMPs and LMPs in polyethylene were 2.47 and 0.67 off Tokai and 2.71 and 0.76 in Tokyo Bay, respectively. No significant differences in the CI were found between polyethylene and polypropylene. However, significant differences in CIs were found between SMPs and LMPs. The relationship between the major length of MPs and CI was significantly negative for both polyethylene and polypropylene (p < 0.05). The results indicate that as MPs degrade, they become finer and exhibit a higher CI at the sea surface.

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