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科学通报  2012 

北京冬季PM1中有机气溶胶的高分辨率气溶胶质谱观测

DOI: 10.1360/csb2012-57-5-366, PP. 366-373

Keywords: 高分辨率气溶胶质谱,有机气溶胶,粒径分布,元素组成,正矩阵因子解析(PMF)

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Abstract:

有机气溶胶(OA)是大气细粒子中的重要组分,其化学组成和来源的识别对有效控制颗粒物污染水平具有重要意义.利用高分辨率气溶胶飞行质谱对北京2010年冬季亚微米气溶胶(PM1)中OA质量浓度和粒径分布进行了高时间分辨率(5min)的在线测定,以了解其化学特征及来源.结果表明,北京冬季OA的平均浓度为20.9±25.3μg/m3,最小值与最大值分别为1.9和284.6μg/m3.OA的H/C,O/C,N/C的摩尔比分别为1.70,0.17和0.005,相应的OM/OC(有机物和有机碳的质量比)为1.37.OA的粒径分布范围较宽,在积聚模态450nm附近有明显的峰值,而对超细粒子(Dva

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