摘要
2009年9月～2010年8月在兴隆大气背景站,利用Andersen分级采样器进行大气气溶胶样品的采集,并利用离子色谱分析了其中的水溶性无机离子的成分含量.结果表明,TSP、PM2.1和PM1.1中总水溶性无机盐的年平均浓度分别为(89.66±47.66)、(54.44±34.08)和(44.39±29.95)μg·m-3,其中SO42-、NO3-、Ca2+和NH4+为兴隆大气气溶胶中最主要的水溶性无机离子.PM2.1中总水溶性无机离子的年平均浓度占TSP的61%.PM1.1总水溶性无机离子的年平均浓度占TSP的50%,占PM2.1的82%.PM1.1、PM2.1和TSP中水溶性无机离子总浓度季节性变化趋势一致,夏季>秋季>春季>冬季.NH4+与SO42-的摩尔比>2,表明NH4+未被SO42-完全中和.在细粒子中NH4+和SO42-、NO3-均有较好的相关性,相关系数分别为0.96和0.87,表明NH4+可能以(NH4)2SO4和NH4NO3的形式存在.
Size-segregated aerosol samples were collected using Andersen cascade sampler from Sep.2009 to Aug.2010 in Xinglong,a regional atmospheric background station.The water-soluble inorganic ions were analyzed by IC.The result showed that the annual concentrations of the total water-soluble inorganic ions were（89.66±47.66）,（54.44±34.08） and（44.39±29.95） μg·m-3 in TSP,PM2.1and PM1.1,respectively.SO42-,NO3-,Ca2＋ and NH＋4 were the dominant contributors of water-soluble inorganic ions.The total water-soluble inorganic ions in PM2.1 accounted for 61% of TSP.The total water-soluble inorganic ions in PM1.1 accounted for 50% and 82% in TSP and PM2.1,respectively.The seasonal variations of the total water-soluble inorganic ion concentration in TSP,PM2.1 and PM1.1 were the same,following the order of summerautumnspringswinter.The mean molar ratio of NH＋4 to SO42- was larger than 2,indicating that NH＋4 was not completely neutralized by SO42-.NH＋4-SO42- and NH＋4-NO3 -concentrations were strongly correlated（R2 0.96 and 0.87）,indicating that NH＋4 was mainly present as（NH4）2SO4 and NH4NO3.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第1期15-20,共6页
Environmental Science
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-Q02-03)
北京市科技计划项目(D09040903670902)
