| 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 (2023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 / Environmental Chemistry / Crystallinty / Raman spectrometry / Pyroclasts / microplastics / polymer crystallinity / FTIR / Raman spectroscopy / Atmospheric pollution / Air sampling / Polyethylene / Coastal pollution / 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 |
Progress has been made in two aspects of the project:
1. The analyses of melted plastics (i.e. from waste incineration), with specific respect to their crystallinity and oxidation state. This was performed with a combination of Raman spectroscopy and FTIR. This research has been expanded to include pyroclasts and pyroplastics that are found on the Japanese coastal environment, as these are much more prevalent than initially thought. This is an extension of previous work on the crystallized state of environmental plastics (atmospheric and marine environments). It is also within this research that preparations for the upcoming adsorption experiments have been made.
2. The further analyses of microplastics in the atmospheric environment. Using a small volume air sampler, samples have been taken in remote environments and analyses of these is currently underway with Raman spectroscopy. This is expected to continue, with analyses being expanded to the smaller islands in western Japan. Microplastics in the marine environment have also been analyzed.
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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
Currently, both laboratory and environmental experiments have been conducted with only delays in the availability of the Raman spectrometer. A publication pertaining to the crystallization state of environmental plastics was accepted this year and another manuscript on the pyroplastics is currently in preparation.
Expansion of the atmospheric microplastic surveys will be furthered with the purchase of another low volume air sampler and the sample processing is only limited by the availability of machine time (viz. the Raman spectrometer).
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| 今後の研究の推進方策 |
The final year of the project will shift towards gas to solid phase adsorption experiments, where the goal will be to understand how crystalline polymers differ in their capacity to adsorb contaminants. This will leverage the lessons learned from the pyroplastic experiments conducted this year and will test the adsorption of various types of contaminants, though PAHs will remain the focus of the studies. The main challenge will be technical, as the focus will be on the in situ analyses of adsorption and the incorporation of Raman imaging. Environmental surveys of microplastics and their state of degradation will continue throughout.
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