摘要
对长沙市3个采样点夏季大气中的PM10和PM2.5样品pH值和水溶性离子浓度进行了定量分析.结果表明,颗粒物中主要离子是SO42-、NO3-、NH4+和Ca2+;PM10、PM2.5、NH4+和K+浓度夜间高于白天;SO42-和NO3-则相反.颗粒物尤其是PM2.5酸性强;Mg2+、Ca2+和Na+集中在粗粒子中,SO42-、NH4+和K+大部分分布在细颗粒物中,NO3-和Cl-在粗细颗粒段则各占一半.SO2气体发生了二次转化,NO2的转化率不及SO2;由于NO3-/SO42-质量比<1,长沙市的大气污染物来源以固定源为主.
The pH value and concentrations of water-soluble ions in atmospheric PMlo and PM2.5 were analyzed quantitatively at three sampling sites in Changsha City in summer. SO4^2-, NO3^-, NH4^＋ and Ca^2＋ were the major ions in particulate matter; the concentrations of PM10, PM2.5, NH4^＋ and K^＋ were higher in nighttime than in daytime; SO4^2- and NO3 were on the contrary. The particulate matter especially PM2.5 was in great acidic strength; Mg^2＋,Ca^2＋ and Na^＋ concentrated in coarse particles, SO4^2-, NH4^＋ and K^＋ were mostly distributed in fine particles, NO3^- and Cl^- occupied each one half in coarse of crude and fine particles. SO2 gas occurred secondary change, conversion ratio of NO2 was lower than that of SO2; due to the mass ratio of NO3-/SO4^2-〈1, the source of atmospheric pollutant in Changsha City was mainly the stationary source.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2007年第5期599-603,共5页
China Environmental Science
基金
湖南省自然科学基金资助项目(03JJY2002
06JJ4118)
新世纪优秀人才支持计划项目(NCET-04-0769)
教育部科学技术研究重点项目(105126)
