Identification of sources of anthropogenic aerosols using vanadium composition and lead isotope ratio origin from coal combustion

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05585
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34030:Green sustainable chemistry and environmental chemistry-related
• Research Institution: The University of Tokushima
• Principal Investigator: YAMAMOTO Yuhei 徳島大学, 大学院社会産業理工学研究部(理工学域), 講師 (30571228)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: エアロゾル / 湿性沈着 / 微量金属元素 / 同位体比 / 遠隔山岳

Outline of Final Research Achievements

59 wet depositions were collected in mountain and urban areas in Shikoku and Chugoku regions. Concentrations of trace elements and Pb isotope ratios in the wet depositions were measured. Our results showed that the chemical composition in the mountain areas of Shikoku was almost the same composition as in the mountain area of Chugoku area, and that the relative concentrations of V and Cd in the urban areas were larger than those of the mountain area, indicating a contribution from short-range transport. Concentrations of V and Pb show two linear correlations with two different slopes depending on the route of the air mass, when the contribution of long-range transport was dominant. Whereas the contribution from short-range transport was found, the concentrations of V and Pb showed no correlation. Pb isotopic ratios of mountain areas indicated a contribution from long-range transport. The Pb ratios of urban areas indicated a contribution from short-range transport.

Free Research Field

環境化学、分析化学

Academic Significance and Societal Importance of the Research Achievements

同一降水イベンドでは空気塊の遠方経路が共通しているためそれぞれの地点で長距離輸送の寄与は同じであるのに対して、近距離輸送の寄与は地理的要因によって地点ごとに異なる。この共通点と相違点を利用することで国内からの近距離輸送の寄与の検出ツールとして微量元素組成が有用であることを示した点は、本研究の学術的意義である。エアロゾル研究において発生源が近距離(国内)か長距離(国外)かを識別することは重要な課題であり、同位体分析等の高度な分析方法を要していた。それが比較的簡便な濃度分析によって可能になることで、エアロゾルの発生源に関するデータの充実が期待できる。