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Microplastics in the Dredged Soil
Summary
Researchers (in Japan) developed a standardized method for detecting microplastics in dredged marine sediment and applied it to samples from harbors across Japan. This is the first comprehensive nationwide survey of microplastics in harbor dredge spoils, revealing widespread contamination that raises concerns about where this material is disposed.
海洋に流出したマイクロプラスチック（MPs）のかなりの部分は海底に沈降するとされており，さまざまな海域の海底堆積物中からその存在が報告されている．港湾整備事業に伴い多量に発生する浚渫土中にもMPsが含まれており，その影響が危惧されるが調査はほとんど行われていない．本研究では浚渫土中のMPsのモニタリングを行う際に基準となる方法を開発し，その方法を各地の港湾から採取された浚渫土に適用してMPsの分析を行った．本報告は日本各地の港湾を網羅してMPsの分布密度，サイズ組成，材質組成などを比較した初の報告である．
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