辽宁省典型城市道路尘PM2.5成分谱研究

为构建辽宁省典型城市道路尘源成分谱,分别采集了鞍山市和盘锦市道路尘样品,分析了其化学组分特征,用富集因子法和比值法分析了其主要来源,用分歧系数法分析了两个城市成分谱的相似度.结果表明：盘锦市和鞍山市道路尘PM_2.5中的化学组成以有机碳组分（OC）和地壳类元素（Al、Ca、Mg、Fe和K）为主.除Cu和V元素外,其余元素均表现为鞍山市的富集因子大于盘锦市.由比值法可得,盘锦市和鞍山市OC/EC分别为（13.20±6.26）和（3.94±0.63）,均存在二次污染现象;NO₃^-/SO₄^2-的均值分别为（0.52±0.55）和（0.46±0.13）,说明其道路尘PM_2.5受固定源影响更大.盘锦市与鞍山市道路尘成分谱分歧系数为0.354,说明两个源成分谱可能相似.

Study on the road dust source profile of PM2.5 in Liaoning Province typical cities

To establish the road dust source profiles of PM_2.5 at typical cities of Liaoning, road dust samples were collected and analyzed for chemical compositions in Anshan and Panjin city. The main sources of road dust were identified by enrichment factor (EF) and ratio method. The similarity of the road dust profiles of Anshan and Panjin city was evaluated by coefficient of divergence (CD). The results showed that the main chemical compositions were organic carbon (OC) and crustal elements (Al, Ca, Mg, Fe and K). Except for Cu and V, the EF values for other elements in Anshan city were higher than those in Panjin city. The OC/EC values were (13.20±6.26) and (3.94±0.63) in Panjin and Anshan city, respectively, indicating the contribution from secondary organic carbon in Panjin and Anshan city; the NO₃^-/SO₄^2-ratios were (0.52±0.55) and (0.46±0.13), implying that the effects of stationary source (coal combustion) on PM_2.5 were more significant. The CD value is 0.354between Panjin and Anshan city, indicating that the two source profiles might be similar to some extent.