成都市PM_(2.5)中有机碳和元素碳的污染特征及来源  

Pollution Characteristics and Sources of Organic Carbon and Elemental Carbon in PM_(2.5) of Chengdu City

作　　者：范忠雨 李友平[1] 杨铮铮[1] 刘慧芳[1] 蒲敏[1] 

机构地区：[1]西华师范大学环境科学与工程学院化学合成与污染控制四川省重点实验室,四川南充637009

出　　处：《四川环境》2016年第2期76-81,共6页Sichuan Environment

基　　金：化学合成与污染控制四川省重点实验室项目(CSPC2014-4-2);四川省科技厅项目(2015JY0094)

摘　　要：于2009~2010年典型月份采集成都市区大气PM_(2.5) 样品,采用IMPROVE-热光反射法对样品中有机碳(organic carbon,OC)和元素碳(elemental carbon,EC)进行分析,探讨OC和EC浓度水平、来源及二次有机碳分布特征。结果表明,成都市年均OC和EC质量浓度分别为(22.6±10.2)μg/m3和(9.0±5.4)μg/m3,与国内外其他城市相比,污染严重;OC和EC的质量浓度呈现明显季度差异,均为秋冬季>春夏季;相关性分析表明,OC和EC秋冬季节相关性较好,表明其来源相近,春夏季节相关性差,表明其来源较为复杂;OC/EC值>2,且估算出二次有机碳(secondary organic carbon,SOC)年均值为(8.9±4.6)μg/m^3,占OC质量浓度的38.5%,表明二次污染严重。In this study,organic carbon（ OC） and elemental carbon（ EC） in PM2.5 samples in Chengdu city during typical months from 2009 to 2010 were analyzed with IMPROVE- TOR reflection method,and the ratio of OC / EC,pollution levels,source,and distribution characteristics of secondary organic carbon（ SOC） were discussed in detail. The results showed that the annual average mass concentrations of OC and EC in PM2.5 were（22. 6 ± 10. 2） μg / m3and（9. 0 ± 5. 4） μg / m3. Chengdu was seriously polluted compared with domestic and overseas cities; there were significant quarter differences between the mass concentrations of OC and EC,both for autumn and winter higher than spring and summer; the correlation analysis showed that better correlations between OC and EC in autumn and winter had led to their similar sources but poor correlations between OC and EC in spring and summer had led to their complicated sources; when annual average OC / EC ratio was greater than 2,the concentrations of secondary organic carbon（ SOC） was（8. 9 ± 4. 6） μg / m^3 and had accounted for 38. 5% of OC,which showed the serious pollution of secondary organic carbon.

关 键 词：PM2.5 有机碳 元素碳 二次有机碳 来源 

分 类 号：X513[环境科学与工程—环境工程]