Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals, China National Analytical Center, Guangzhou 510070, China.
Sci Total Environ. 2010 May 15;408(12):2492-500. doi: 10.1016/j.scitotenv.2010.02.043. Epub 2010 Mar 25.
Air samples were collected weekly at an urban site and a suburban site in Guangzhou City, China, from April 2005 to March 2006, to measure the concentrations of polycyclic aromatic hydrocarbons (PAHs) in the ambient air and study their seasonal variations, gas/particle partitioning, origins and sources. The concentrations of summation Sigma16-PAHs (particle+gas) were 129.9+/-73.1 ng m(-)(3) at the urban site and 120.4+/-48.5 ng m(-)(3) at the suburban site, respectively. It was found that there was no significant difference in PAH concentrations between the urban and suburban sites. Seasonal variations of PAH concentrations at the two sampling sites were similar, with higher levels in the winter that gradually decreased to the lowest levels in the summer. The average concentrations of summation Sigma16-PAHs in the winter samples were approximately three times higher than those of the summer samples because in the summer local emissions dominated, and in the winter the contribution from outside sources or transported PAHs is increased. The plot of logK(p) versus logP(L)(0) for the data sets of summer and winter season samples had significantly different slopes at both sampling sites. The slopes for the winter samples were steeper than those for the summer samples. It was also observed that gas/particle partitioning of PAHs showed different characteristics depending on air parcel trajectories. Steeper slopes were obtained for an air parcel that traveled across the continent to the sampling site from the northern or northeastern sector, whereas shallower slopes were obtained for air masses that traveled across the sea from the southern or eastern sector. Diagnostic ratio analytical results imply that the origins of PAHs were mainly from petroleum combustion and coal/biomass burning. The anthracene/phenanthrene and benzo[a]anthracene/chrysene ratios in the winter were significantly lower than those in the summer, which indicate that there might be long-range transported PAH input to Guangzhou in the winter.
空气样本于 2005 年 4 月至 2006 年 3 月间每周在广州市的城区和郊区采集，以测量环境空气中多环芳烃（PAHs）的浓度并研究其季节性变化、气/粒分配、来源和来源。城区和郊区空气中 Σ16-PAHs（颗粒+气体）的浓度分别为 129.9+/-73.1 ng m(-)(3)和 120.4+/-48.5 ng m(-)(3)。研究发现，城区和郊区 PAH 浓度之间没有显著差异。两个采样点 PAH 浓度的季节性变化相似，冬季浓度较高，逐渐降至夏季最低水平。冬季 Σ16-PAHs 平均浓度约为夏季的三倍，因为夏季本地排放占主导地位，而冬季则增加了来自外部来源或运输 PAHs 的贡献。冬季和夏季数据集的 logK(p)与 logP(L)(0)的关系图在两个采样点都具有显著不同的斜率。冬季样本的斜率比夏季样本的斜率更陡。还观察到，PAHs 的气/粒分配表现出不同的特征，具体取决于空气包裹体的轨迹。从北方或东北方向跨越大陆到达采样点的空气包裹体的斜率较陡，而从南方或东方跨越海洋的空气团的斜率较浅。诊断比分析结果表明，PAHs 的来源主要来自石油燃烧和煤/生物质燃烧。冬季的蒽/菲和苯并[a]蒽/屈比值明显低于夏季，这表明冬季可能有长距离传输的 PAH 输入到广州。
