Shen Li-Juan, Wang Hong-Lei, Sun Jie-Juan, Liu Shi-Yun, Liu Huan-Wu, Zhao Tian-Liang
School of Atmosphere and Remote Sensing, Wuxi University, Wuxi 214105, China.
Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Huan Jing Ke Xue. 2023 Sep 8;44(9):4843-4852. doi: 10.13227/j.hjkx.202210051.
To investigate the pollution characteristics of carbonaceous components in PM and PM of road dust fall and soil dust in Xi'an and enrich their source profiles, samples from five sites of road dust fall and 16 sites of soil dust were collected in Xi'an from April to May 2015. The ZDA-CY01 particulate matter resuspension sampler was used to obtain PM and PM samples, and the Model5L-NDIR OC and EC analyzer were used to determine the concentrations of organic carbon (OC) and elemental carbon (EC) in PM and PM. The pollution and sources of carbonaceous aerosol in PM and PM were investigated by analyzing OC and EC characteristics, ratio, and the principal component analysis statistical model. The results showed that the proportions of OC in PM and PM at the various dust fall sites differed, ranging from 6.0% to 19.4% and 7.6% to 29.8%, respectively. The ratios of EC in PM and PMat the different dust fall sites were relatively small, accounting for 0.6%-2.2% and 0.2%-3.6% in urban sites, respectively; however, EC was almost undetectable in most peripheral soil dust. The proportions of carbonaceous components in PM and PM followed the order of urban road dust fall>external control dust>river beach soil dust>soil dust and urban road dust fall>soil dust>external control dust>river beach soil dust, respectively. OC dominated the carbonaceous aerosols at the different sites, which was relatively low in urban road dust fall. The OC to total carbon (TC) ratios in PM and PM at urban road dust fall were 85.2%-95.3% and 87.9%-98.9%, respectively. The OC to TC ratios in PM and PM of soil dust were relatively high, exceeding 99%. Carbonaceous components were primarily concentrated in fine particles. The pollution distribution of carbonaceous components in the urban road dust fall sites was consistent, whereas that in the different soil dust sites were quite different. The carbonaceous components in urban road dust fall and soil dust were primarily affected by pollutant source emissions such as biomass burning, coal burning, gasoline, and diesel vehicle exhaust. There were differences in the source contribution rates of carbonaceous aerosols in PM and PM.
为研究西安市道路降尘和土壤扬尘中PM及PM的碳质组分污染特征并丰富其源谱，于2015年4月至5月在西安市采集了5个道路降尘点位和16个土壤扬尘点位的样品。采用ZDA - CY01颗粒物再悬浮采样器获取PM及PM样品，使用Model5L - NDIR OC和EC分析仪测定PM及PM中有机碳（OC）和元素碳（EC）的浓度。通过分析OC和EC特征、比值以及主成分分析统计模型，研究了PM及PM中碳质气溶胶的污染情况和来源。结果表明，各降尘点位PM及PM中OC的比例不同，分别为6.0%至19.4%和7.6%至29.8%。不同降尘点位PM及PM中EC的比值相对较小，城区点位分别占0.6% - 2.2%和0.2% - 3.6%；然而，在大多数周边土壤扬尘中EC几乎检测不到。PM及PM中碳质组分的比例顺序分别为城区道路降尘＞外部对照扬尘＞河滩土壤扬尘＞土壤扬尘以及城区道路降尘＞土壤扬尘＞外部对照扬尘＞河滩土壤扬尘。不同点位碳质气溶胶以OC为主，城区道路降尘中OC含量相对较低。城区道路降尘PM及PM中OC与总碳（TC）的比值分别为85.2% - 95.3%和87.9% - 98.9%。土壤扬尘PM及PM中OC与TC的比值相对较高，超过99%。碳质组分主要集中在细颗粒物中。城区道路降尘点位碳质组分的污染分布一致，而不同土壤扬尘点位的污染分布差异较大。城区道路降尘和土壤扬尘中的碳质组分主要受生物质燃烧、煤炭燃烧、汽油和柴油车尾气等污染物源排放的影响。PM及PM中碳质气溶胶的源贡献率存在差异。
