【摘要】 采用大流量采样器,于2002年春季(3月)对南京市城区PM10、PM2.5(大气中粒径dp≤10或2.5mm的颗粒物)进行了研究测定,并对其水溶性组分及pH值进行分析.结果表明,南京市大气颗粒物春季污染严重,PM10超标率达83%.PM2.5全部超标,超标倍数为1.8~4.9.PM2.5的酸性明显强于PM10. PM2.5中水溶性组分占总量的24.4%,其中,阴离子约为8.0%,水溶性金属元素+NH4+约为8.9%,TOC约为7.5%.这些水溶性组分对干、湿沉降的酸度影响较大,且主要以细颗粒的形态存在,其在大气中滞留时间较长,对人类的影响深远,应引起足够重视.更多还原

【Abstract】 Determinations and studies of PM10 and PM2.5 (particulate of size in atmosphere dp≤10 or 2.5mm) have been carried out with sampler of large flow capacity in spring (March) 2002 in Nanjing City; and their water-soluble component and pH are also analyzed. The results show that the atmospheric particulate pollution is serious in spring in Nanjing City, 83% and 100% respectively. PM2.5 is 1.8~4.9 times of the Air Quality Standards. Water-soluble component is 24.4% of all total in which 8.0% is anion, 8.9% is cation, and 7.5% is TOC. These water-soluble components have strong effect on the acidity of rainfall or snow, which have a rather long life in the atmosphere in the fine form, and far-reaching influence to human being; thus enough attention should be paid to them.更多还原