令和7年度 第2回環境プラスチック研究会を下記のとおり開催します。
本研究会は環境中に広がったプラスチックに関する研究についての情報交換を目的としたもので、学内外の研究者や学生を主な対象としております。土壌や河川、海洋などの環境中のプラスチックだけでなく、プラスチック廃棄物やバイオプラスチック生成などの分野の方、地球科学に興味のある方や高分子科学・環境毒性学からのアプローチに加えて、社会科学的観点から見た環境問題にも興味を持つ研究者など幅広い分野からの参加をお待ちしています。もちろん、興味があるだけ、話を聴きたいだけの方も歓迎します。ぜひお気軽にお立ち寄りください。
＜プログラム＞
15：00～16：30
講師：Won Joon Shim 教授（Department of Marine Environmental Engineering, Gyeongsang National University, Republic of Korea）
演題：Generation of Microplastics from Marine Based Sources
要旨：Global concern over marine plastic pollution has grown rapidly since the presence and increasing abundance of microscopic plastic particles in the ocean were first documented in the early 2000s. While the fragmentation of large plastic items into nano- and microplastics increases the abundance of plastic litter, their weathering and fragmentation rates remain largely unaddressed. In particular, knowledge and data regarding microplastic generation from marine-based sources—such as plastic debris on beaches, ships, and active and derelict fishing gear—have been very scarce.
At the Korea Institute of Ocean Science and Technology, we have actively studied the fragmentation mechanisms and quantitative assessment of secondary microplastic (MP) and/or nanoplastic (NP) generation. The changes in surface characteristics of six thermoplastics (HDPE, PP, PS, PET, PA, and PLA) after photooxidation in air or water were evaluated. We used a xenon-arc lamp with a daylight filter to simulate natural sunlight, enabling a direct comparison among the polymer types under identical weathering conditions. We then quantified the generated NPs and MPs and calculated their generation rates (particles/cm2·year). In addition, we characterized and quantitatively determined microplastics generated by ship paints during maintenance processes like hydro-blasting. We also evaluated microplastic contamination in ship’s greywater, which is discharged directly into the ocean, across different ship types. Furthermore, we conducted a laboratory simulation to measure microplastic generation from the friction between PP or PE ropes and ship’s gear during deployment and retrieval. Finally, the emission factors were derived from these marine-based sources to estimate microplastic emissions to the marine environment on both national and global scales. The NP and MP generation and emission rates obtained from marine-based sources could partially fill the data gap in the global microplastic emission inventory and provide a crucial basis for developing effective policies to manage plastic pollution.
16：30～17：00
自由討論
＜世話人＞
磯辺篤彦 応用力学研究所 教授（環境・食料ユニットサブリーダー）
高原淳 ネガティブエミッションテクノロジー研究センター 特任教授
大嶋雄治 農学研究院 特任教授
岡﨑裕典 理学研究院 教授
倉田哲也 未来社会デザイン統括本部 環境・食料ユニット 学術推進専門員
