Interaction between polycyclic aromatic hydrocarbons (PAHs) and mineral grains with clarification of PAHs carrier in the atmosphere

从2003年4月开始，在日本金泽收集了一年的气溶胶颗粒，研究了亚洲沙尘对多环芳烃（PAHs）的远距离输送。不同沙尘事件中亚洲沙尘颗粒物中多环芳烃含量差异很大。发展的动力学模型表明，挥发性低于苯并[a]芘的多环芳烃在亚洲尘埃颗粒上的吸附速率太低而不能累积。亚洲尘埃颗粒中这些多环芳烃的来源最初是工业化地区周围被多环芳烃污染的土壤颗粒（例如工业化地区周围的黄土地区）。后向轨迹分析还表明，亚洲沙尘中多环芳烃含量高、低挥发性的可能来源于黄土地区，而亚洲沙尘中多环芳烃含量低的可能来源于蒙古和中国北方。在控制温度和相对湿度（RH）条件下，研究了Pyr（一种多环芳烃模型化合物）对亚洲沙尘颗粒物不同组分的稳定性。Sianol和Aluminol在黑暗条件下催化多环芳烃的降解，RH冲洗和光照对催化效果有增强作用。粘土矿物质保护Pyr免受RH上升和光照的影响，持续数天。多环芳烃最现实的载体是粘土矿物。地质物质对多环芳烃大气环流的贡献比以前认为的要大。

Long range transport of Polycyclic aromatic hydrocarbons (PAHs) with Asian dust was investigated by collecting Aerosol particles through a year from April 2003 at Kanazawa, Japan. PAHs content in Asian dust particles were highly variable in different Asian dust events. Developed kinetic model showed that sorption rate of less volatile PAHs than BaP on Asian dust particles are too low to be accumulated. The origin of those PAHs in Asian dust particles would be originally PAH-polluted soil particles around industrialized area (e.g. loess regions around industrialized area). Back trajectory analyses also showed Asian dust with high less volatile PAHs content would have derived from loess area while Asian dust with undetectable amount of PAHs would have had source region in Mongolia and northern China. The stability of Pyr (a model PAHs) on different component of Asian dust particles was investigated under controlled temperature and relative humidity (RH) condition with/without light irradiation. Sianol and aluminol catalyze PAHs decomposition in the dark with enhanced catalytic effect by rinse in RH and light irradiation. Clay minerals protect Pyr against rise in RH and light irradiation to last several days. Most realistic carrier of PAHs is clay minerals. Geologic materials contribute atmospheric circulation of PAHs over long distance than previously thought.