摘要
对北京市城区2012年夏季大气气溶胶进行PM2.5和PM10石英膜采样,利用热光反射法得到了有机碳(OC,organic carbon)和元素碳(EC,elemental carbon)的含量;应用Stelson方法,结合其质量浓度、元素含量可溶性离子含量对气溶胶质量浓度进行了质量重建与比对.日平均质量浓度结果显示,PM2.5中,OC浓度ρ(OC)为19.4μg·m-3,EC浓度ρ(EC)为3.8μg·m-3.PM10中,ρ(OC)为22.3μg·m-3,ρ(EC)为4.1μg·m-3.OC、EC相关性显著(PM2.5,R2=0.77;PM10,R2=0.91).PM10中有87%的OC和94%的EC集中在PM2.5中.PM2.5和PM10中OC/EC比值分别为5.1和5.7,明显大于2,说明存在二次有机碳.PM2.5和PM10重建值和称质量值相关性R2分别为0.95和0.94,重建值和称质量值比值分别为93%和97%.
Daily atmospheric aerosol PM2.5 and PM10 were sampled on quartz films in urban Beijing in summer of 2012.Mass concentrations of OC(organic carbon),EC(elemental carbon)and other compositions were investigated.Reconstruction of particulate matter concentration was conducted by the Stelson method.Data showed that for PM2.5,the average daily OC concentration was 19.4μg.m-3,EC was 3.8μg.m-3.For PM10,the average daily OC concentration was 22.3μg.m-3,EC was 4.1μg.m-3.A strong linear correlation between OC and EC(PM2.5,R2=0.77;PM10,R2=0.91)was observed.It was found that 87% OC and 94% EC of PM10 was concentrated in PM2.5.The ratios of OC/EC in PM2.5and PM10 were 5.1and 5.7respectively,which suggested the existence of secondary organic carbon. Comparison between reconstructed mass concentrations(RMC)and gravimetric mass concentrations(GMC)indicated that,linear correlation R2 of RMC and GMC was 0.95 for PM2.5and 0.94 for PM10.The ratio RMC/GMC was 0.93 for PM2.5and 0.97 for PM10.
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第3期241-245,331,共6页
Journal of Beijing Normal University(Natural Science)
基金
北京市自然科学基金资助项目(1142006)
中央高校基本科研业务费专项基金资助项目
关键词
北京
夏季气溶胶
碳质
质量浓度重建
Beijing
summer aerosol
carbonic matter
mass concentration reconstruction
