大気汚染物質長距離輸送時における粒子状有機物質の人為起源,自然起源および一次排出,二次生成の寄与

Behavior of organic matter in the airborne aerosols during the long -range transport of photochemical air pollution was investigated in summer (29-31 July 1986). Measurements were made for every 3 hours along the transport route from the Tokyo Bay area to the i nland mountainous region. C21-C32 n-Alkanes, phthalates (dibutyl and bis(2-ethylhexyl)), C2-C10 dicarboxylic acids, pinonaldehyde, C10-C26 fatty acids, nonpolar unresolved complex mixture (NPUCM) and polar unresolved complex mixture (PUCM) were detected and their fraction of anthropogenic and natural components and those of primary and secondary compo nents were discussed. Concentration of organic matter in total increased when the poliuted air ma ss arrived at the observation sites. NPUCM and PUCM were much abundant. From the ratio of odd and even carbon number components, more than a half of n-alkanes was estimated to be anthropogenic. Biogenic compounds (pinonaldehyde, long-chain C12-C26 fatty acids and nalkanes)were minor contribution in the airborne aerosols, a large part of them, in particular the pinonaldehyde which was produced in the photochemical reactions, however existing in the gaseous phase in the daytime. Almost all of dicarboxylic acids and about a half of NPUCM and PUCM were also produced during the transport. Thus, the secondary components attained 42-53 % of organic compounds analyzed in the polluted air mass over the inland area. Here, the organic compounds analyzed, including NPUCM and PUCM attained 30-50 % of the total organic carbon.