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为明确石家庄市夏季道路尘中有机碳和元素碳污染特征及来源,用样方法采集市区4种不同类型共8条铺装道路尘样,处理后经热光碳分析仪测定有机碳(OC)和元素碳(EC)组分.结果表明:总碳(TC)在道路尘PM2.5、PM10中质量分数分别为129 465.2,103 911.4 μg/g;PM2.5和PM10中OC和EC相关系数分别为0.94和0.86,可认为OC、EC来源基本一致;OC/EC均＞2,表明存在二次有机碳(SOC)的贡献;通过OC/EC最小比值法估算得出SOC占PM2.5和PM10中OC总量的42.5％和32.8％,一次有机碳(POC)贡献较大;夏季道路积尘中的碳主要来自于汽、柴油车尾气排放、大气降尘中燃煤成分和生物质燃烧.“,”In order to analyze pollution characteristics of OC and EC from road dust in Shijiazhuang in summer,road dust samples were collected from 8 paved roads dividied into 4 types.Thermal/optical carbon analyzer (IMPROVE-TOR) was employed to detect the concentrations of 8 carbon fractions in dust samples.Results showed that the concentration of total carbon(TC)of PM2.5 and PM10 were 129 465.2,103 911.4 μg/g.The correlation between concentration of OC and EC in PM2.5 and PM10 was significant for R =0.94,0.86,which indicated that they had similar source.All OC/EC ratios exceeded 2,that suggested that there existed SOC contributing to OC.Mass concentration of SOC occupied 42.5％ and 32.8％ of OC in PM2.5 and PM10 estimated by minimum OC/EC ratio method.POC had significant contribution to OC.Both OC/EC analysis and principal component analysis indicated that vehicle exhaust,deposition of coal combustion and biomass combustion were the primary sources of OC and EC from road dust in Shijiazhuang during summer.