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Assessment of the sources and inflow processes of microplastics in the river environments of Japan

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Kataoka, Tomoya, Nihei, Yasuo, Kudou, Kouki, Hinata, Hirofumi·2019·Environmental Pollution

Abstract

The numerical and mass concentrations of microplastics collected at 36 sites on the surfaces of 29 Japanese rivers were mapped and compared with four basin characteristics (basin area, population density, and urban and agricultural ratios) and six water quality parameters (pH, biochemical oxygen demand (BOD), suspended solids (SS), dissolved oxygen (DO), total nitrogen (T-N), and total phosphorus (T-P)) in each river basin. Microplastics were found in 31 of the 36 sites, indicating that some plastics fragment into small pieces before reaching the ocean. The microplastic concentrations are significantly correlated with urbanisation and population density, indicating that the microplastic concentrations in the river depend on human activities in the river basin. Furthermore, we found a significant relationship between the numerical and mass concentrations and BOD, which is an environmental indicator of river pollution. This result demonstrates that microplastic pollution in river environments has progressed more in polluted rivers with poor water quality than in rivers with good water quality, leading to the conclusion that the sources and inflow processes of microplastics in river environments are similar to those of other pollutants. Our findings can help identify potential sources (i.e., point and non-point sources) of fragmented microplastics to improve waste management in Japan and model the transport fluxes of fragmented microplastics in Japanese rivers using water quality parameters and basin characteristics.

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Metadata

Authors
Kataoka, T., Nihei, Y., Kudou, K., & Hinata, H.
Venue
Environmental Pollution
Publisher
Elsevier BV
Published
2019-01
Volume
244
Pages
958-965
ISSN
0269-7491 (ISSN-L)
OpenAlex
W2898933860
Cited by
536
References
13
FWCI
14.60
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Assessment of the sources and inflow processes of microplastics in the river environments of Japan. https://app.cochat.ai/papers/10.1016/j.envpol.2018.10.111
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Kataoka, T., Nihei, Y., Kudou, K., & Hinata, H. (2019). Assessment of the sources and inflow processes of microplastics in the river environments of Japan. Environmental Pollution. https://doi.org/10.1016/j.envpol.2018.10.111

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