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Comparative evaluation of the carbonyl index of microplastics around the Japan coast

Marine Pollution Bulletin 2023 61 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
Murat Çelik, Murat Çelik, Haruka Nakano, Haruka Nakano, Haruka Nakano, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Haruka Nakano, Atsuhiko Isobe Haruka Nakano, 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 Keiichi Uchida, Atsuhiko Isobe Keiichi Uchida, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Keiichi Uchida, Keiichi Uchida, Keiichi Uchida, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Keiichi Uchida, Atsuhiko Isobe Atsuhiko Isobe Keiichi Uchida, Atsuhiko Isobe Atsuhiko Isobe Murat Çelik, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Keiichi Uchida, Atsuhiko Isobe Keiichi Uchida, Keiichi Uchida, Atsuhiko Isobe Keiichi Uchida, Keiichi Uchida, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Haruka Nakano, Hisayuki Arakawa, Atsuhiko Isobe Keiichi Uchida, Hisayuki Arakawa, Hisayuki Arakawa, Haruka Nakano, Atsuhiko Isobe Haruka Nakano, Haruka Nakano, Atsuhiko Isobe Hisayuki Arakawa, Haruka Nakano, Haruka Nakano, Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Hisayuki Arakawa, Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Hisayuki Arakawa, Haruka Nakano, Atsuhiko Isobe Atsuhiko Isobe Haruka Nakano, Atsuhiko Isobe Keiichi Uchida, Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Atsuhiko Isobe Hisayuki Arakawa, Atsuhiko Isobe Atsuhiko Isobe Atsuhiko Isobe Keiichi Uchida, Atsuhiko Isobe Atsuhiko Isobe Hisayuki Arakawa, Murat Çelik, Atsuhiko Isobe Haruka Nakano, Atsuhiko Isobe Keiichi Uchida, Keiichi Uchida, Atsuhiko Isobe Keiichi Uchida, Atsuhiko Isobe

Summary

Researchers evaluated the carbonyl index of nearly 3,000 polyethylene and polypropylene microplastic particles collected from coastal waters around Japan. The study found that the degree of weathering, as measured by the carbonyl index, varied by geographic location but showed no significant differences based on particle color or shape, providing insight into how microplastics degrade in marine environments.

Polymers
PE PP

The carbonyl index (CI) of polyethylene and polypropylene microplastics (MPs) (2950 particles) collected in coastal waters around Japan was investigated. The CI of MPs was calculated by the specified area under band technique. The mean MP CI in all samples (regardless of shape and color) was 0.69 ± 0.34 and 0.70 ± 0.34 for polyethylene and polypropylene, respectively, and there was no significant difference in the color or shape of the MPs. The polyethylene, white, and fragment MPs CI was negatively (p < 0.05) correlated with the major length of the MPs. Large MPs with relatively little deterioration were distributed along the west coast of the Sea of Japan, whereas small MPs were distributed along the east coast. Our findings of this gradual change in the deterioration of MPs, based on geographical distribution, are in accordance with literature CI-size and MP degradation hypotheses.

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