| 海南三亚大气颗粒物中水溶性无机离子浓度及其粒径分布特征 |
| 摘要点击 2585 全文点击 1260 投稿时间：2016-08-12 修订日期：2016-11-14 |
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| 中文关键词 水溶性无机离子 季节变化 粒径分布 三亚 |
| 英文关键词 water-soluble inorganic ions seasonal variation size distribution Sanya |
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| 中文摘要 |
| 为研究我国旅游城市海南省三亚市大气颗粒物浓度水平及其化学成分，于2012年6月~2014年5月，使用惯性撞击式分级采样器采集大气颗粒物样品，并利用离子色谱法分析了其中的水溶性无机离子浓度及粒径分布.结果表明，PM2.1和PM2.1~9中总水溶性无机离子浓度平均值分别为（8.91±7.27）μg·m-3和（11.34±9.37）μg·m-3.PM2.1中SO42-和NH4+占总水溶性无机离子的质量分数比较高，二者总和达到72.2%；PM2.1~9中Cl-、Ca2+和Na+占比较高，三者总和为67.6%.PM2.1中总水溶性无机离子浓度在冬季最高，春秋季节次之，夏季浓度最低，分别为（14.58±8.88）、（9.33±7.72）、（8.72±4.42）和（3.82±1.59）μg·m-3；PM2.1~9中总水溶性无机离子浓度夏季最高（17.14±16.00）μg·m-3，冬季次之（10.59±3.80）μg·m-3，春季和秋季变化差异不大，分别为（9.41±3.63）μg·m-3和（8.21±3.24）μg·m-3.SO42-和NH4+呈细粒径段为主的双模态分布，春季、夏季和秋季细粒径段峰值出现在0.43~0.65 μm粒径段，而冬季则出现在0.65~1.1 μm粒径段，细粒径段峰值出现由凝结模态向液滴模态转移的现象；NO3-、Na+、Cl-、Ca2+和Mg2+呈粗粒径单峰分布，峰值出现在4.7~9 μm粒径段；K+为双模态分布，细、粗粒径段峰值分别出现在0.43~0.65 μm和4.7~5.8 μm.三亚作为我国少数PM2.5年均值达标城市，水溶性无机离子来源主要为二次源、海盐和土壤尘及降尘. |
| 英文摘要 |
| Size-resolved filter samples were collected in Sanya every other week from June 2012 to May 2014. The mass concentrations of water-soluble inorganic ions, including anions (Cl-, NO3-, SO42-) and cations (Na+, NH4+, K+, Mg2+, Ca2+) were measured by ion chromatography. The results showed that the total concentrations of measured water-soluble inorganic ions were (8.91±7.27) and (11.34±9.37) μg·m-3 in PM2.1 and PM2.1-9, respectively. In PM2.1, SO42- and NH4+ comprised 72.2% of all water-soluble inorganic ions, while in PM2.1~9, Cl-, Ca2+ and Na+ comprised 67.6% of all water-soluble inorganic ions. In PM2.1, the total concentrations of water-soluble inorganic ions had highest concentrations in winter and lowest concentrations in summer. In PM2.1~9, the total concentrations of water-soluble inorganic ions presented the highest concentrations in summer. SO42- and NH4+ showed bimodal size distributions and the peaks in the fine mode shifted from 0.43-0.65 μm in spring, summer and autumn to 0.65-1.1 μm in winter. NO3-, Na+, Cl-, Ca2+ and Mg2+ were unimodal with the peaks in the coarse mode of 4.7-9.0 μm. K+ showed bimodal size distribution with the fine mode at 0.43-0.65 μm and the coarse mode at 4.7-5.8 μm. PCA analysis showed that water-soluble inorganic ions were mainly affected by the secondary formation, sea salt and soil particles or falling dust. |
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