区分分割法を用いたオゾンーテルペン反応に伴うSOA不均一核生成・凝集反応の数値予測

摘要

Recently, theoretical analysis and experiment have been initiated to investigate the generation of secondary organic aerosols (SOA) by chemical reactions in indoor air. In particular, it has been confirmed that SOA are generated by the re­action of ozone with various terpenoids. The overarching goal of this work was to better understand ozone, VOC (volatile organic compounds) and generated SOA distributions within rooms. We carried out cylindrical test chamber experiments to measure SOA generation from the chemical reaction of ozone and limonene and discussed numerical models to describe it. In this paper, we propose a method for predicting the particle size distribution of SOA generated by ozone and limonene chemical reactions in air. In particular, we discuss an analytical method that involves a sectional modeling approach gov­erning equations of SOA. Although the changes in particle size distribution in a 40-section model were reproduced to a certain extent, rigorous modeling for the generation and growth of SOA and an increased number of sections are needed for improvement of prediction accuracy.%1．序生活様式の変化に伴う汚染源の変化ならびに計測技術の進歩に伴う新たな汚染物質の顕在化等により室内環境中での空気汚染問題が多様化，複雑化している。例えば，シックハウス問題に代表される揮発性有機化合物VOCによる空気汚染問題，ダンプハウス問題に代表される室内の高湿度環境と微生物，各種アレルゲンによる健康影響問題は，居住者の健康意識の高まりと共に大きな社会問題となり，複雑な要素が絡み合う問題であるが故に産官学の連携した対策が強く求められている。特に近年では，仕上げ材等の汚染源から放散される揮発性有機化合物VOCによる直接的な健康影響問題のみならず，気相化学物質の相互反応に起因する新たな汚染物質の生成による二次的な空気汚染とその人体影響が問題視され始めている。