鞍山城区夏季PM2.5中碳组分污染特征及来源

Pollution Characteristics of Carbon Fractions in PM2.5 and Their Sources in Urban Area of Anshan City in Summer

    摘要
  • 摘要: 2014年7月采集鞍山市大气中PM2.5样品，采用IMPROVE-TOR方法准确测量了样品中的8个碳组分，研究了鞍山城区夏季PM2.5及其载带的碳组分的污染特征。鞍山市夏季PM2.5浓度为(53.4±18.0) μg/m3。有机碳(OC)、元素碳(EC)和总碳(TC)占PM2.5的比例分别为(11.89±3.86)%、(4.79±1.31)%和(16.68±5.02)%，表明碳是鞍山市城区夏季PM2.5中的重要成分。PM2.5中OC、EC浓度显著相关，R=0.715；另外，全市OC/EC的平均值为2.49±0.43，所有监测点位OC/EC的平均值均>2，表明PM2.5中二次有机碳(SOC)对OC有贡献，从而说明OC、EC的来源相同。8个碳组分（OC1、OC2、OC3、OC4、EC1、EC2、EC3、OPC）的丰度研究显示，鞍山市城区夏季PM2.5中碳主要来源于机动车尾气尘、道路尘和燃煤尘。

     

    Abstract: A study on the PM2.5 in the urban area of Anshan city in summer and pollution characteristics of carbon fractions in PM2.5 was presented. PM2.5 samples were collected at Anshan city in July, 2014. Thermal/Optical Carbon Analyzer (IMPROVE-TOR) was employed to detect the concentrations of eight carbon fractions in particulate samples. The results showed that the average mass concentration of PM2.5 in Anshan in summer was (53.4±18) μg/m3. Organic Carbon(OC), Element Carbon(EC) and Total Carbon(TC) took (11.89±3.86)%, (4.79±1.31)% and (16.68±5.02)%, showing that carbon was the important component of PM2.5 in Anshan in summer. The correlation between OC and EC was significant in PM2.5, R=0.715. Moreover, the average of OC/EC ratios in PM2.5 was 2.49±0.43. All the OC/EC ratios exceeded 2. This result suggested that there existed secondary organic carbon in ambient air contributing to OC. All of this showed the sources of OC and EC were the same in general. The percentage of eight carbon fractions（OC1、OC2、OC3、OC4、EC1、EC2、EC3、OPC）in PM2.5 indicated that vehicle exhaust, road dust and coal combustion were primary sources of carbon in PM2.5 in Anshan during summer.

     

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