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j.envpol.2023.122198.pdf | 3.35 MB | Adobe PDF | 見る/開く |
タイトル: | Quantification of microplastic by particle size down to 1.1 μm in surface road dust in an urban city, Japan |
著者: | Morioka, Tamaki Tanaka, Shuhei https://orcid.org/0000-0001-9029-5938 (unconfirmed) Yamada, Yuta Yukioka, Satoru Aiba, Fumihiro |
著者名の別形: | 森岡 たまき 田中, 周平 山田, 雄太 雪岡, 聖 相場, 史寛 |
キーワード: | Microplastic (MP) Surface road dust Pyrolysis–gas chromatography–mass spectrometry Particle size fractions Loss on ignition |
発行日: | 1-Oct-2023 |
出版者: | Elsevier BV |
誌名: | Environmental Pollution |
巻: | 334 |
論文番号: | 122198 |
抄録: | The impact of microplastics (MPs, plastic particles ≤5 mm) on ecosystems is of great concern. Road surfaces represent a significant source of MPs where plastic fragments are physically and chemically reduced to MPs. However, the literature lacks information on fragmentation tendencies below 11 μm. This study aimed to characterize the occurrence of MPs in road dust in different size fractions down to 1.1 μm. Road dust was collected at five sites near a major road in Kusatsu city, Japan, and partitioned by size into 13 fractions (1.1–850 μm). The coarser fractions accounted for a greater proportion of the dust. The percentage of organic matter, determined by loss on ignition, increased as the fractions became finer. Pyrolysis-gas chromatography-mass spectrometry was used to quantify 12 types of polymers in each fraction. The dust was found to contain nine types of MP, namely, polyethylene (PE), polypropylene (PP), polyvinylchloride (PVC), polystyrene (PS), styrene/butadiene rubber (SBR), acrylonitrile/butadiene/styrene resin (ABS), polycarbonate (PC), polymethylmethacrylate (PMMA), and polyamide 66 (PA66). The total MP concentration in road dust particles by particle size fraction (concentrationf) began to increase from the 125–250 μm fraction and remained elevated in finer fractions down to 1.1 μm, indicating that MPs in the road dust micronized to at least 1.1 μm. However, for individual polymer types, the tendency for concentrationf to increase or decrease with particle size fraction varied: the concentrationf of some polymers, such as PE and PVC, remained elevated in fractions down to 1.1 μm; the concentrationf of SBR, a rubber-MP, showed a stable or decreasing trend in fractions of 7.0–11 μm and finer. Particles of PE, PVC, and some other plastics might become increasingly finer, even down to 1.1 μm. Further research is needed to understand the comminution limits of these polymers under pertinent environmental conditions. |
著作権等: | © 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC license. |
URI: | http://hdl.handle.net/2433/286946 |
DOI(出版社版): | 10.1016/j.envpol.2023.122198 |
出現コレクション: | 学術雑誌掲載論文等 |
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