Investigation of Concentration and Potential Sources of Microplastics in Sediments Collected from the Urban Freshwater Bodies, Lake Ezu (Kumamoto) and Ohorikoen Pond (Fukuoka)

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  • ERA Yoichi
    Graduate School of Science and Technology, Kumamoto University
  • NAKATA Haruhiko
    Faculty of Advanced Science and Technology, Kumamoto University

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  • 都市淡水域における底泥中マイクロプラスチックの濃度分布と起源推定：江津湖 (熊本市) と大濠公園池 (福岡市) を例に
  • トシ タンスイイキ ニ オケル ソコ デイチュウ マイクロプラスチック ノ ノウド ブンプ ト キゲン スイテイ : ゴウツコ(クマモトシ)ト ダイゴウ コウエンチ(フクオカシ)オ レイ ニ
  • Investigation of concentration an potential sources of microplastics in sediments collected from the urban freshwater bodies, Lake Ezu (Kumamoto) and Ohorikoen Pond (Fukuoka)

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Abstract

<p>Investigations of microplastic pollution have been conducted in the ocean and coastal areas, but few studies exist for terrestrial waters, such as rivers and lakes in urban areas, which are the main sources of microplastic. In this study, we monitored microplastic pollution in sediments collected from Lake Ezu in Kumamoto City and Ohorikoen Pond in Fukuoka City. As a result, microplastics were detected in sediments at almost all sampling sites, the median concentrations were 725 to 1,034 items kg-1 dry weight in Lake Ezu and 61 items kg-1 in Ohorikoen Pond. The difference in microplastic concentrations may be due to the operation of a water treatment facility at Ohorikoen Pond. On the other hand, high concentrations of microplastics were detected in sediments near boat houses on Lake Ezu (36,086 items kg-1) and Ohorikoen Pond (2,794 items kg-1) . Polymethyl methacrylate (PMMA) was the dominant component of microplastics in sediments from both sampling sites. The samples of boat paint collected from boat houses were also identified to be PMMA. These results indicate the possibility of boat paints being a potential source of microplastics in an urban freshwater environment.</p>

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