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

多环芳烃 (PAHs) 与矿物颗粒之间的相互作用以及大气中 PAHs 载体的澄清

基本信息

批准号：
17340163
负责人：
SATO Tsutomu
金额：
$ 8.67万
依托单位：
Hokkaido University (2006-2007)Kanazawa University (2005)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

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.

通过从 2003 年 4 月开始的一年时间里在日本金泽收集气溶胶颗粒，研究了多环芳烃 (PAH) 随亚洲灰尘的远距离迁移。在不同的亚洲沙尘事件中，亚洲沙尘颗粒中的多环芳烃含量差异很大。开发的动力学模型表明，亚洲粉尘颗粒上挥发性比 BaP 低的多环芳烃的吸附率太低而无法累积。亚洲尘埃颗粒中的多环芳烃的来源可能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）。回溯轨迹分析还显示，低挥发性多环芳烃含量较高的亚洲沙尘可能来自黄土地区，而多环芳烃含量无法检测到的亚洲沙尘可能来自蒙古和中国北部。在受控温度和相对湿度（RH）条件下（有/无光照射）研究了 Pyr（一种模型 PAH）对亚洲尘埃颗粒不同成分的稳定性。硅烷醇和铝醇在黑暗中催化 PAHs 分解，并通过在 RH 中冲洗和光照射增强催化效果。粘土矿物质可保护吡咯免受相对湿度升高和光照射的影响，持续数天。多环芳烃最现实的载体是粘土矿物。地质材料对多环芳烃的远距离大气循环的影响比以前认为的要大。