名古屋大学グローバルCOEプログラム 地球学から基礎・臨床環境学への展開

BCES

セミナー

Chemical characterisation of inhalable airborne particles

スケジュール

2011年10月24日(月)
理学部E館101号室

講演者

Dr. Teresa Moreno(Visiting Fellow, Japan Society for the Promotion of Science / Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Barcelona, Spain)

問い合わせ

WALLIS Simon(環境学研究科地球環境科学専攻・教授)

詳細

It is increasingly clear from analytical datasets on airborne particulate matter (PM) obtained from standardised air monitoring stations that there is great variability in the chemical composition of inhalable inorganic aerosols both in space and time. This chemical complexity is best demonstrated using selected elements which, combined with source apportionment techniques such as positive matrix factorisation, allow differentiation between geological and anthropogenic sources. Typical geological elements in PM are associated with natural felsic silicates, carbonates and accessory minerals, and so include Al, K, Ca, Rb, Li, Sc, Zr, Hf, Ti, La and Ce. In contrast, anthropogenic tracer elements emitted by industry and/or traffic include a range of metals and metalloids such as Zn, Pb, As, Cu, Sb, and Cd, which are not only toxic but concentrate in the finer, more deeply inhalable PM fraction of ambient air, and are therefore more likely to become involved in inflammation and oxidative stress after inhalation. In most countries local severe pollution episodes such as the infamous London coal smogs belong to the poorly regulated industrial past. Instead, modern concerns focus more on the health effects of city traffic emissions and regional pollution outflows from industrial areas. In this talk the methodology behind PM characterisation and source apportionment is overviewed, and data from recent studies by the CSIC Barcelona air pollution group used to demonstrate the striking variability of atmospheric PM chemistry. In particular, we focus on recent results from the ongoing Kumamoto Transboundary Aerosol Project to illustrate the effect on atmospheric chemistry produced by the arrival of transboundary pollution plumes from mainland Asia into Japan.

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