北京市西北城区取暖期环境大气中PM_(10)的物理化学特征

Physicochemical Characterization of the PM_(10) in Ambient Air of Northwestern Beijing Urban Area During Heating-period

根据监测资料探讨了北京市西北城区取暖期PM10 的逐日变化规律和日变化规律 .分别使用X射线衍射仪(XRD)和扫描电镜 (SEM)研究PM10 中的矿物成分及其微观形貌特征 .结果表明夜间PM10 浓度普遍高于白天 .XRD分析显示颗粒物粒度越细 ,其中所含的矿物种类越少 .SEM研究得出 ,单个PM10 颗粒类型可初步分为有链状集合体、簇状集合体、圆球状、片状和不规则形状等 5类 .从数量上看 ,PM10

Based on monitoring data,the daily and day\|to\|day changes of PM 10 mass concentrations in northwestern Beijing urban area during heating\|period were discussed.XRD and SEM were applied to study the mineral compositions and morphology of the PM 10 ,respectively.It was concluded that concentration of PM 10 at nighttime was higher than that at daytime generally.By XRD analysis,it was found that the finer the particles,the less the minerals in it.Furthermore,from the SEM micrograph,five types of the particles,mostly from coal burning and diesel exhaust in number concentration,were classified as chain\|like aggregate,cluster aggregate,spherical particle,flake\|like particle and non\|regular particle.