摘要
采用电称低压冲击器(ELPI)对南京城区可吸入颗粒物粒径分布和质量浓度进行连续在线测量,得到了南京城区大气可吸入颗粒物的日变化特征,表明其呈现双峰、双谷分布,夜间高,白天低,上午高,下午低;结合气象参数,研究了大气可吸入颗粒物浓度变化与气象因子的相关性;此外,对可吸入颗粒物粒径分布特征也进行了研究,可以看出,南京地区可吸入颗粒物的主要成分是细颗粒(PM2.5),粒径在0.028～2.31μm的颗粒物占可吸入颗粒物的98%～99%。
The concentration and size distribution of PM10 were measured by electrical low pressure impactor （ELPI） in Nanjing urban atmosphere. The diurnal variation of PM10 concentration was obtained, which suggested that the concentration was high in night, low in daytime, high at a.m, low at p.m; the relativities between PM10 concentration and weather conditions were researched; the character of size distribution of PM10 was also researched. The result shows that the main components of PM10 are PM2.5, the percentage of the particles sized 0.028～2.31μm is 98%～99%.
基金
国家重点基础研究计划("973"计划)资助(2002CB211600).
关键词
电称低压冲击器
可吸入颗粒物
气象因子
粒径分布
Electrical low pressure impactor
PM10
Parameter of weather
Size distribution
