2022 Fiscal Year Final Research Report
Establishment of analytical method for microplastics by pyrolysis-GC/MS
| Project/Area Number |
19K20468
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 64010:Environmental load and risk assessment-related
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| Research Institution | Kagawa University (2020-2022)
Soka University (2019) |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | マイクロプラスチック / ガスクロマトグラフィー / 熱分解法 |
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| Outline of Final Research Achievements |
In this study, we conducted several basic investigations to establish a pyrolysis-GC-MS analytical method. As a result, first, linear relationships in n-alkadiene, n-alkene, and n-alkane with the PE amount were found as pyrolysis products using a portable pyrolyzer-GC-MS. The highest product yield was obtained under 590 °C conditions. In the coexistence of two sediments, there was a difference in the PE quantity correlation in the mixings, which depended on GC backgrounds. However, quantifiable correlation were obtained in both conditions. In an UV irradiation experiment of PE, the amount of n-alkadiene and n-alkene showed an increasing with UV exposing time, especially after 30 days. The ratio of short carbon number vs. long carbon number (e.g., C12/C20) increased with the degradation of the plastic. This suggests the possibility that plastics is cracked to short chains due to UV irradiation.
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| Free Research Field |
分析化学
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| Academic Significance and Societal Importance of the Research Achievements |
FT-IRにかけるためには単離（ピックアップ）を必要とした．一方、熱分解GC-MS分析では、熱分解生成物をGCカラム部で単離するため、プラスチック以外との混合物（生体試料や堆積物試料中）であっても、 複雑な前処理をすることなくMPの分析が可能である． 本研究で，熱分解生成物とプラスチック量との間位に相関関係が見出されたことから，これまで，単離することのできなかったマイクロプラスチックの分析が，熱分解-GC-MSを用いて可能となると期待される．この応用は，水圏生物のプランクトンレベルにまで，発展させることができるため，生態系のマイクロプラスチックの生物濃縮メカニズムなどを追うことも可能だろう．
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