摘要
2002年6-7月于广州市3个采样点采集PM10和PM2 5样品,测定了PM10,PM2 5以及元素碳(EC)和有机碳(OC)的浓度。PM10和PM2 5平均浓度分别为124 77μg·m-3及78 13μg·m-3。PM10和PM2 5中的OC浓度分别为22 3μg·m-3和15 80μg·m-3,EC浓度分别为7 78和5 90μg·m-3,其中73 8%的OC和77 7%的EC存在于PM2 5中。在3个采样点PM10和PM2 5中,OC EC比值均大于2 0,表明广州夏季大气存在二次污染。各种气象条件对OC、EC浓度及其比值的变化都有不同程度的影响,其中降水和风速是OC、EC浓度变化的主要气象因素。
To characterize carbonaceous aerosol pollution in Guangzhou, PM-(10) and PM-(2.5) samples were collected using a mini-volume sampler in three sites during June to July, 2002. The organic carbon (OC) and elemental carbon (EC) were analyzed by thermal/optical analysis method. The average mass concentrations of PM-(10) and PM-(2.5) were 124.77 and 78.13 μg·m^(-3), respectively. The average concentrations of OC in PM-(10) and PM-(2.5) were 22.3 and 15.80 μ·m^(-3), and EC were 7.78 and 5.90 μg·m^(-3), respectively. About 70%～80% of OC and EC occurred in PM-(2.5). Moreover, OC/EC ratio either in PM-(10) or in PM-(2.5) exceeded 2.0. These results suggest that there exists secondary of pollution organic aerosols in ambient air of Guangzhou. The meteorological conditions, especially the rainfall and wind speed have significant effect on the ambient concentrations of OC and EC, as well as OC/EC ratio.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第5期61-65,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目(20347003)
广东省教育厅基金资助项目
关键词
PM10
PM2.5
有机碳
元素碳
广州
PM-(10)
PM-(2.5)
organic carbon
elemental carbon
Guangzhou city
