【摘要】 细粒子 (空气动力学直径小于 2 5 μm的颗粒物 )污染是许多城市重要的大气环境问题 .从 1 999年至 2 0 0 0年对北京市细粒子展开了 4次采样和化学分析 ,有效采样天数为 40d .利用正定矩阵分解 (PMF)方法对细粒子的来源进行了分析 .化学成分包括EC(元素碳 )、有机物、SO2 - 4、F- 、Cl- 、Fe、Ca、K、Mg、Al、Na、Zn、Mn、Ti、Pb、Ba和P等 1 7种 .发现主要来源有 6类 :地面扬尘、建筑源、生物质燃烧、二次源、机动车排放和燃煤 .更多还原

【Abstract】 The positive matrix factorization(PMF)method was used to apportion the sources for fine particles in Bejing.The data were obtained from four samplings from 1999 to 2000.The number of this data set was 40.The chemical compositions used in analysis include element carbon(EC),organics,SO 2- 4,F -,Cl -,Fe,Ca,K,Mg,Al,Na,Zn,Mn,Ti,Pb,Ba and P.Six main sources,soil dust,construction dust,secondary source(by photochemical action),biomass burning,motor vehicle and coal burning were found.更多还原