| 研究課題/領域番号 |
22K18041
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分64010:環境負荷およびリスク評価管理関連
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| 研究機関 | 島根大学 |
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研究代表者 |
長門 豪 島根大学, 学術研究院環境システム科学系, 助教 (50793832)
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| 研究期間 (年度) |
2022-04-01 – 2025-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2024年度: 260千円 (直接経費: 200千円、間接経費: 60千円)
2023年度: 2,080千円 (直接経費: 1,600千円、間接経費: 480千円)
2022年度: 2,340千円 (直接経費: 1,800千円、間接経費: 540千円)
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| キーワード | microplastics / polymer crystallinity / FTIR / Raman spectroscopy / Atmospheric pollution / Air sampling / Polyethylene / Coastal pollution / Microplastics / Atmospheric particulate / Waste combustion / Contaminant adsorption |
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| 研究開始時の研究の概要 |
This research will examine the chemical structure of atmospheric microplastics. Laboratory studies will examine how the structure of plastics change during combustion, as waste incineration may be a source of these microplastics. The adsorption of contaminants to these surfaces will also be studied.
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| 研究実績の概要 |
Research has been centered on the creation of amorphous and crystalline plastics for later use in adsorption tests, as well as studying the extent to which these types of plastics exist in the environment.
For the former, plastics such as polyethylene and PET have been used for creating crystalline/amorphous standards using various melt/freeze cycles. Methods for the analyses of these plastics have been examined using both Raman spectroscopy and FTIR.
In studies of environmental plastics, the change in polymers such as polyethylene and PET have been observed, with general increases in crystallinity and formation of carbonyl groups on the surface of plastics exposed to uv over long periods outdoors. The crystallinity of PET bottles is not uniform, with the tops and bottoms of bottles being more amorphous. This has implications for the extent of environmental degradation expected to occur. As expected, polyethylene was comparatively more resistant to degradation.
Atmospheric sampling is currently ongoing, with various types of filters being tested to understand which is best for sampling in remote locations.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Current research has mostly been preliminary and in service of the later gas to surface adsorption tests, as well as the combustion tests that will be performed in years 2 and 3 of the project. Project is largely on track.
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| 今後の研究の推進方策 |
The next phase of research will be moving towards making a setup for the burning of plastics to see if the types of polymer change differ from that observed in the environment (i.e. if crystallinity/amorphousness) are affected. While the combustion component of the research is ongoing , the adsorption experiments using various types of PAHs will be set up and tested. This will require extensive quality testing (i.e. gas flow, evaporation of PAHs, et cetera). Ultimately analyses will be performed with GCMS and an extraction procedure of contaminants from plastic surfaces will need to be developed.
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