贵阳市秋、冬季PM_(2.5)中碳组分污染特征及来源分析  

Characteristics and Source Analysis of Carbonaceous Aerosol in PM_(2.5) of Guiyang City,P.R.China during Autumn-winter Period

作　　者：王珍[1] 郭军[1,2] 陈卓[1,2] 

机构地区：[1]贵州师范大学化学与材料科学学院,贵阳550001 [2]贵阳市大气细粒子和大气污染化学重点实验室,贵阳550001

出　　处：《地球与环境》2015年第3期285-289,共5页Earth and Environment

基　　金：贵阳市科技计划项目(筑科合同[2011401]社6-3号);贵阳市科技计划项目(筑科合同[2012303]14号)

摘　　要：为研究贵阳市大气细粒子PM2.5中有机碳(OC)和元素碳(EC)的污染特征,于2013年10月14日至2013年12月25日,采集2个监测点位秋季和冬季的PM2.5样品,检测分析PM2.5中有机碳(OC)、元素碳(EC)的质量浓度。结果表明,秋季PM2.5中OC的平均浓度为14.9μg/m3,EC的平均浓度为2.31μg/m3;冬季PM2.5中OC的平均浓度为26.2μg/m3,EC的平均浓度为7.53μg/m3,呈冬季高、秋季低的季节变化特征。秋、冬季PM2.5中OC/EC的值均大于2,表明存在二次有机碳(SOC)的贡献;秋季SOC的值为6.89μg/m3,冬季SOC的值为8.29μg/m3。通过计算PM2.5中8个碳组分丰度,初步判断PM2.5中秋季碳的主要来源是汽车尾气、道路扬尘和生物质燃烧,冬季碳的主要来源是汽车尾气、燃煤尘和道路扬尘。Concentrations of organic carbon（OC）and element carbon（EC）in PM2.5 were measured at two sites in Guiyang City,P.R.China from October 14 to December 25,2013.Results showed that the average concentrations of OC and EC in PM2.5were 14.9and 2.31μg/m^3 in autumn and were 26.2and 7.53μg/m^3 in winter;respectively.Moreover,OC/EC ratios in PM2.5in autumn and winter all exceeded 2.0,suggesting that there existed secondary organic carbon in ambient air in both autumn and winter.The average mass concentration of SOC was 6.89μg/m^3 in autumn and 8.29μg/m^3 in winter.The percentage of eight carbon fractions in PM2.5indicates that primary sources of particulate pollution of Guiyang City were vehicle exhaust,road dust and biomass combustion in autumn,and vehicle exhaust,coal combustion and road dust in winter.

关 键 词：贵阳市 PM2.5 元素碳 有机碳 污染特征 

分 类 号：X131.1[环境科学与工程—环境科学]