苏南农村地区大气PM2.5元素组成特征及其来源分析

为了解苏南农村地区大气细颗粒物的污染水平及其可能的来源,在2002年7月-2003年1月的夏、秋、冬3个季节对雪堰镇和太湖站PM_2.5进行采样和分析,得到了PM_2.5和14种组成元素的质量浓度.研究表明,苏南农村地区PM_2.5的污染水平较高,S,Zn,Pb和As 4种污染元素的质量浓度水平与城市接近;组成元素的季节分布规律存在区域差异,这可能与局地源的贡献,大气细颗粒物中、长距离传输以及复杂的气象条件有关.因子分析结果表明,土壤源、燃煤源、冶金或垃圾焚烧和汽车尾气4类源对PM_2.5有明显贡献,说明人类活动对苏南农村地区PM_2.5具有重要影响. 

Characteristics of Elements in PM2.5 and Sources Analysis of PM2.5 in Rural Areas of Southern Jiangsu Province

To understand pollution level and possible sources of atmospheric fine particulates in rural areas of southern Jiangsu Province,samples of PM_(2.5) were collected and analyzed in Xueyan Town and Taihu Lake Station over three seasons(summer,autumn,winter) from July 2002 to January 2003.The mass concentrations of PM_(2.5) and 14 principal component elements were obtained.The results showed that pollution of PM_(2.5) had been serious and the concentration level of S,Zn,Pb and As was similar to cities.There was different regional and seasonal distribution law of elements in PM_(2.5),probably due to contribution of local sources and complicated meteorological condition.The result of principal components analysis showed that main sources of PM_(2.5) included crustal re-suspension,coal burning,metal processing industry or waste incineration,and vehicular emission,which suggested that anthropogenic behavior was of important influence on PM_(2.5) in rural areas of southern Jiangsu Province.