| 阜康大气气溶胶中水溶性无机离子粒径分布特征研究 |
| 摘要点击 1696 全文点击 1027 投稿时间：2013-09-25 修订日期：2013-12-04 |
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| 中文关键词 粒径分布 采暖期和非采暖期 水溶性无机离子 重污染 农业活动 阜康 |
| 英文关键词 size distribution heating and non-heating periods water-soluble inorganic ions heavy pollution agricultural activity Fukang |
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| 中文摘要 |
| 为了解阜康大气气溶胶中水溶性无机离子的浓度水平、来源以及粒径分布，本研究于2011年2月~2012年2月利用8级惯性撞击式分级采样器采集了阜康大气气溶胶样品，使用离子色谱测定了其中水溶性无机离子含量. 分析比较了非采暖期和采暖期主要离子的变化趋势、浓度水平、构成、来源以及粒径分布，在此基础上选取特殊采样日分析了重污染、秸秆燃烧以及春耕期的离子组成以及粒径分布的差异. 结果表明，阜康细粒子、粗粒子中总水溶性无机离子（TWSI）在非采暖期和采暖期的浓度分别为11.17、12.68μg·m-3和35.98、22.22μg·m-3；非采暖期的SO42-主要来自盐碱土扬尘，NO3-和NH4+主要来自农田土壤扬尘，而采暖期的SO42-、NO3-和 NH4+主要来自煤炭等化石燃料燃烧. 8种离子在非采暖期和采暖期均呈现双峰分布，相对于非采暖期，采暖期的SO42-、NO3-和 NH4+在细粒径段的峰值发生了粒径增长，SO42-和NH4+在粗粒径段的峰值出现在3.3~4.7 μm处. 重污染期间二次污染严重，离子主要分布在1.1~2.1 μm处；秸秆燃烧期受生物质燃烧影响大，离子主要分布在<0.65 μm粒径段；春耕期土壤扬尘较多，离子主要分布在>3.3 μm粒径段. |
| 英文摘要 |
| To investigate the levels and size distributions of water soluble inorganic components, samples were collected with Andersen cascade sampler from Feb. 2011 to Feb. 2012, in Fukang, and were analyzed by IC. The variation trend, concentration level,composition,sources and size distribution of major ions during non-heating period were compared with heating period. Based on the specific samples, ionic compositions and size distributions were analyzed during heavy pollution, straw burning and spring planting periods. The results showed that inorganic components in Fukang were severely affected by heating. The total water soluble ions in fine and coarse particles during non-heating and heating periods were 11.17, 12.68μg·m-3 and 35.98, 22.22μg·m-3,respectively. SO42- was mainly from saline-alkali soil, NO3- and NH4+ were from resuspension of farmland soil during non-heating period,while SO42-, NO3- and NH4+ were all from the fossil fuel consumption during the heating period. All ions were bimodal distribution during non-heating and heating periods. During the heating period, the particle size growth of SO42-,NO3- and NH4+ in fine mode was found, SO42- and NH4+ peaked at 3.3-4.7 μm in coarse particles. Secondary pollutions were serious during heavy pollution days with high levels of secondary ions between 1.1 and 2.1 μm. Biomass burning obviously affected the size distribution of ions during the straw burning period and ions focused on smaller than 0.65 μm, while there were more soil dusts during spring planting periods and ions concentrated in larger than 3.3 μm. |
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