Duan Jing-chun, Bi Xin-hui, Tan Ji-hua, Sheng Guo-ying, Fu Jia-mo, Hao Ji-ming
State Key Laboratory of Organic Geochemistry, Guangzhou Key Laboratory of Environment and Resources, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Huan Jing Ke Xue. 2006 Apr;27(4):624-30.
Size distribution of aerosol samples collected from two urban locations (Liwan and Wushan) and a suburban location (Xinken) in Guangzhou (South China) in autumn using Micro-Orifice Uniform Deposit Impactor (MOUDI) were analyzed for 13 polycyclic aromatic hydrocarbons (PAHs) by gas chromatography with mass selective detection (GC-MS). Bimodal distribution was found for 3- and 4-ring PAHs and unimodal for 5-, 6- and 7-ring PAHs. Different PAH size distribution models were found for urban and suburban. PAHs associated with larger particles in suburban than in urban, and different aging processes of aerosols can account for it. Adsorption behavior may be the main mechanism controlled the size distribution of PAHs in urban, and adsorption, absorption and multilayer adsorption may all play a part in suburban. For the diagnostic ratios of PAHs with the same molecular weight, large differences were found between the range of 1-2.5 microm and 0.1-0.56 microm. The concentrations of 13 PAHs were 39 ng/m3 in Xinken, 71-94 ng/m3 in Wushan and 32-154 ng/m3 in Liwan, and 5-7 ring PAHs were the most abundant.
利用微孔均匀沉积冲击器（MOUDI）对秋季在中国南方广州两个城市地点（荔湾和五山）及一个郊区地点（新垦）采集的气溶胶样本的粒径分布进行了分析，采用气相色谱-质谱选择性检测（GC-MS）法测定了13种多环芳烃（PAHs）的含量。结果发现，3环和4环PAHs呈双峰分布，5环、6环和7环PAHs呈单峰分布。城市和郊区的PAH粒径分布模型不同。郊区与较大颗粒相关的PAHs比城市多，气溶胶的不同老化过程可以解释这一现象。吸附行为可能是控制城市中PAHs粒径分布的主要机制，而在郊区，吸附、吸收和多层吸附可能都起作用。对于相同分子量的PAHs诊断比值，在1-2.5微米和0.1-0.56微米范围内发现了很大差异。新垦的13种PAHs浓度为39 ng/m³，五山为71-94 ng/m³，荔湾为32-154 ng/m³，其中5-7环PAHs含量最高。
