| 植物释放挥发性有机物(BVOC)向二次有机气溶胶(SOA)转化机制研究 |
| 摘要点击 2779 全文点击 1423 投稿时间：2011-05-09 修订日期：2011-07-25 |
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| 中文关键词 二次有机气溶胶 挥发性有机物 驱蚊草 固相微萃取 气相色谱质谱 |
| 英文关键词 secondary organic aerosols(SOA) volatile organic compounds (VOCs) Pelargonium × Citrenella solid phase microextraction (SPME) GC/MS |
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| 中文摘要 |
| 利用自制玻璃生态罩,研究植物挥发性有机物(BVOC)的释放机制.在紫外光诱导条件下,BVOC 经历一系列的光氧化反应,最终产生了二次有机气溶胶(SOA).运用固相微萃取(SPME)和气相色谱-质谱联用(GC-MS)技术,对目标植物(驱蚊草)释放出的 BVOC 进行采样分析,共检测出 7种主要化合物,其中主要为单萜类、倍半萜类、醇类和酮类物质.研究发现,在紫外光的照射下,这些 BVOC 可以发生光氧化反应转化为 SOA.利用串联差分淌度分析仪(TDMA)测定 SOA 的粒径分布和SOA颗粒物的吸湿性.结果表明粒径范围大致是 50～320 nm,吸湿性研究发现这些SOA 具有吸湿性,生长因子可以从 1.05 增长到 1.11. |
| 英文摘要 |
| A laboratory study was carried out to investigate the biogenic volatile organic compounds (BVOC) in a lab-made glass chamber. The secondary organic aerosol (SOA) products can be detected under the UV photooxidation of BVOC. Pelargonium × Citrenella was chosen as the target plant in this research because it can release a large amount of BVOCs. The predominant 7 alkene and ketol compounds were detected by using solid phase microextraction (SPME) sampling and gas chromatography/mass spectrometry (GC/MS) analysis. The photochemical experiment indicated that these BVOC can be rapidly oxidized into SOA under UV-B irradiation. A tandem differential mobility analyzer (TDMA) was used to measure the size distribution and the hygroscopicity of the SOA. The particle diameter was in the range of 50 nm to 320 nm. The high hygroscopicity of SOA was also obtained and the size increased from 1.05 to 1.11 during the wet experiment. |
