| 兴隆大气气溶胶中水溶性无机离子分析 |
| 摘要点击 2969 全文点击 1737 投稿时间：2012-03-28 修订日期：2012-05-14 |
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| 中文关键词 TSP PM2.1 PM1.1 大气气溶胶 水溶性无机离子 |
| 英文关键词 TSP PM2.1 PM1.1 aerosol water-soluble inorganic ion |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| 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 NH4+ 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 summer>autumn>springs>winter. The mean molar ratio of NH4+ to SO42- was larger than 2, indicating that NH4+ was not completely neutralized by SO42-.NH4+-SO42- and NH4+-NO3- concentrations were strongly correlated (R2 0.96 and 0.87), indicating that NH4+ was mainly present as (NH4)2SO4 and NH4NO3. |
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