德州市大气细粒子中碳组分的污染特征研究  

Pollution Characteristics of OC and EC in PM_(2.5) in Dezhou,China

作　　者：刘泽常[1] 许夏[1] 程慧娟[1] 杜世勇 张清爽 张桂芹[1] 

机构地区：[1]山东建筑大学市政与环境工程学院,山东济南250101 [2]济南市环境保护监测中心站,山东济南250014 [3]德州市环境监测中心站,山东德州253000

出　　处：《环境科学与技术》2014年第1期105-109,共5页Environmental Science & Technology

摘　　要：2012年2-9月间在德州市城区及郊区布置6个采样点位,分别采集了采暖季(2012年2月28日-3月4日)、风沙季(2012年5月3日-8日)、非采暖季(2012年9月20日-9月25日)共216个PM2.5样品膜,采用美国Sunset Laboratory Inc热光反射法碳谱分析仪测定了PM2.5样品中OC、EC的浓度值,应用OC/EC比值法对SOC进行了估算。结果表明,德州市PM2.5污染较严重,年平均浓度为159.68μg/m3,各点位浓度的空间分布无明显差异,季节变化趋势为:采暖季>风沙季>非采暖季。PM2.5中OC和EC的平均浓度分别为16.80μg/m3、3.65μg/m3;OC和EC的日均浓度分别占PM2.5的9.61%和2.10%,OC是PM2.5的重要组成部分;OC、EC浓度的季节变化趋势与PM2.5浓度特征相同。年平均浓度为3.91μg/m3;SOC在OC和PM2.5中所占的比例分别为22.30%和2.54%,SOC对OC具有较大的贡献;SOC在OC中所占的比值季节变化趋势为风沙季>非采暖季>采暖季。216 PM2.5 samples were collected at 6 spot locations in urban and suburban districts of Dezhou, Shandong Province in the sampling period of heating season of February 28-March 4, 2012, wind season of May 3-May 8, 2012 and non-heating season of September 20-September 25, 2012. Organic carbon （OC） and element carbon （EC） in PM2.5 were analyzed by DRI （Sunset Laboratory Inc. ） carbon analyzer, and secondary organic carbon （SOC） was estimated with OC/EC method. Results showed that there was a serious pollution in Dezhou, with annual mean concentration of PM2.5 as 159.68 μg/m3. The distribution of PM2.5 concentration has no difference in every spot location. The trend of seasonal variation from high to low was described by heating season, wind season, non-heating season. Average concentration of OC and EC were 16.80μg/m3 and 3.65 μg/m3. Average percentage of OC and EC in PM2.5 were 9.61% and 2.10%, and OC was an important part of PM2.5. Seasonal variation trend of concentration of OC and EC was the same with PM2.5. Annual average concentrations of secondary organic carbon （SOC） was 3.91 μg/ma, accounting for about 22.30% and 2.54% of total OC and PM2.5 respectively. The contribution of SOC to OC was calculated from high to low as wind season, non-heating season and heating season.

关 键 词：PM2 5 有机碳(OC) 元素碳(EC) 二次有机碳(SOC) 污染特征 

分 类 号：X513[环境科学与工程—环境工程]