中文摘要：

研究了天津冬季PM2.5和PM10中碳成分的污染特征。结果表明，天津冬季PM2.5和PM10的平均质量浓度分别为（124．4±60．9）、（224．6±131．2）μg／m^3；总碳（TC）、有机碳（OC）与元素碳（EC）在PM2.5中的平均质量分数比在PM10中分别高出5．0％、3．6％、1．2％；PM2.5中OC、EC的相关系数较高，为0．95，表明OC、EC的来源相对简单，可能主要反应了燃煤和机动车尾气的贡献。OC／EC的平均值在PM2.5和PM10中分别为3．9、4．9，次生有机碳（SOC）在PM2．5和PM10中的平均质量浓度分别为14．9、23．4μg／m^3，分别占OC的48．5％（质量分数，下同）、49．8％，OC／EC较高可能主要与直接排放源有关；PM2.5中的OC1与OC2的比例明显高于PM10，而聚合碳（OPC）的比例又低于PM10，同时PM2.5与PM10中的EC1含量均较高，表明天津冬季燃煤取暖和机动车尾气是重要的污染源。

英文摘要：

20 particulate samples were colleted in winter of Tianjin to study pollution characteristics of carbon in PM2.5 and PM10 in Tianjin winter atmosphere. Thermal/Optical Carbon Analyzer was employed to detect the concentration of organic carbon （OC） and element carbon （EC） in particulate samples. The resulted showed that the average concentration of PM2.5 and PM10 in Tianjin winter were （124.4±60.9）μg/m^3 and （224.6±131.2） μg/m^3 respectively, the percentage of total carbon （TC）, OC and EC in PM2.5 was higher than that of PM10. Correlation between OC and EC in PM2. 5 was 0.95, which showed the source of OC and EC was rather simple, while the source of OC and EC in PM10 was respectively complex. The average rates of OC/EC in PM2.5 and PM10 were 3.9 and 4.9. The high rate of OC/EC was mainly related to directly emission source but not secondary pollution from photochemical reactions. The percentage of eight carbon fractions in PM2. 5 and PM10 indicated that coal combustion and vehicle exhaust were important source of particulate pollution in winter of Tianjin.