中文关键词道路扬尘PM_2.5有机碳元素碳鞍山市 英文关键词road dustPM_2.5organic carbon (OC)elemental carbon (EC)Anshan

作者	单位	E-mail
林孜	南开大学环境科学与工程学院, 天津 300350	812754714@qq.com
姬亚芹	南开大学环境科学与工程学院, 天津 300350	jiyaqin@nankai.edu.cn
林宇	南开大学环境科学与工程学院, 天津 300350
国纪良	南开大学环境科学与工程学院, 天津 300350
马妍	南开大学环境科学与工程学院, 天津 300350
赵静琦	南开大学环境科学与工程学院, 天津 300350

中文摘要 为研究鞍山市道路扬尘PM_2.5中碳组分污染特征及来源，于2014年10月采集鞍山市9条道路的扬尘样品，通过再悬浮得到PM_2.5滤膜样品，利用热光碳分析仪测定PM_2.5中OC（有机碳）和EC（元素碳）并分析其特征.结果表明，道路扬尘PM_2.5中ω（TC）为9.78%（外环路）~14.00%（千山西路），ω（OC）为8.15%（外环路）~10.84%（千山西路），ω（EC）为1.63%（外环路）~2.85%（千山西路），ω（OC）明显高于ω（EC），说明各道路扬尘中含有较多的有机碳；采样期间OC/EC的值均大于2，说明道路扬尘中均可能存在二次污染；通过Spearman相关分析及线性拟合可知，鞍山市道路扬尘PM_2.5中OC和EC来源大致相同；聚类分析表明，鞍山市道路扬尘PM_2.5中碳组分主要来源于机动车尾气排放、生物质燃烧和煤炭燃烧. 英文摘要 In order to study the characteristics and sources of carbon fractions in PM_2.5 in road dust in Anshan, road dust samples were collected from nine roads in Anshan in October 2014 and re-suspended on filters using a NK-ZXF sampler to obtain PM_2.5 samples. A thermal optical carbon analyzer (IMPROVE-TOR) was employed to measure the mass fraction of organic carbon (OC) and elemental carbon (EC) in PM_2.5. The results showed that ω(TC) in PM_2.5 in road dust was 9.78% (outer loop)-14.00% (Qianshan West Road), ω(OC) was 8.15% (outer loop)-10.84% (Qianshan West Road), and ω(EC) was 1.63% (outer loop)-2.85% (Qianshan West Road). ω(OC) was much higher than ω(EC), indicating that road dust contained a large amount of organic carbon. All OC/EC values were greater than 2.0 during the sampling period, suggesting that there was secondary pollution. Spearman correlation analysis and linear fitting indicated that the sources of OC and EC were basically the same. Cluster analysis results showed that carbon components in PM_2.5 in road dust in Anshan mainly originated from vehicle exhaust, biomass burning, and coal combustion emissions.

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