摘要
为探讨兰州市大气细颗粒物化学组成及其污染来源,对兰州市大气PM_(2.5)中水溶性离子、无机元素以及OC和EC进行了研究。结果表明:PM_(2.5)浓度及其化学组成具有明显的季节变化特征,PM_(2.5)浓度为冬季>春季沙尘>春季>夏季;水溶性离子以SO_4^(2-)、NH_4^+和NO_3^-浓度最高,占总水溶性离子的78.7%~87.1%,表明该地区的二次污染较为严重,主成分分析表明水溶性离子主要来源于燃烧源和土壤源;无机元素以Zn、Pb和Ba浓度最高,主要来源于燃煤和机动车源;OC冬季浓度最高,而EC夏季浓度最高,并形成了较严重的二次有机碳污染。
To explore the chemical composition and sources of the atmospheric fine particles in Lanzhou,the water-soluble ions,inorganic elements,OC and EC in PM2.5 in the air in Lanzhou were studied. The results show that,the concentrations of PM2.5 and its chemical composition showing an obvious seasonal variation characteristic,and the concentrations of PM2.5 in each season is in the sequence of winter spring dust spring summer; NH4^＋,SO4^2- and NO3^- was the ions with the highest concentrations（ up to 78. 7% - 87. 1% of the total water-soluble ions）,showing the serious secondary pollution in this region;principal component analysis showed that the water-soluble ions mainly come from combustion sources and ground source; Zn,Pb and Ba have the highest concentration among the inorganic elements,mainly from coal burning and vehicle sources; OC gets the highest concentration in winter but EC with the highest concentration in summer,suggesting the serious secondary organic carbon pollution in Lanzhou.
出处
《环境工程》
CAS
CSCD
北大核心
2016年第5期86-90,共5页
Environmental Engineering
基金
国家级大学生创新创业训练计划(860494)
