| 再悬浮装置在大气PM2.5源谱分析中的应用 |
| 摘要点击 3070 全文点击 1866 投稿时间：2011-07-29 修订日期：2011-09-18 |
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| 中文关键词 再悬浮装置 源谱 无组织排放尘 PM2.5 源解析 |
| 英文关键词 resuspension chamber source profile fugitive dust PM2.5 source apportionment |
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| 中文摘要 |
| 为解决PM2.5源解析中无组织排放源的采样问题,在前人基础上发展了一套简便高效的再悬浮采集装置,并对进样量、再悬浮时间等关键运行参数进行了优化,总结了无组织排放源采样分析流程.重复测试表明,双切割头的PM2.5捕集量偏差<8%,粒径分布比率变化不超过5%,显示出再悬浮装置良好的采样平行性和稳定性.将该装置应用于陶瓷工业尘、公路扬尘和二次降尘等3类无组织排放尘及生物质燃烧的源排放再悬浮采样分析,获得了各颗粒源的粒径分布谱和PM2.5无机成分谱,以此对各排放源特征进行有效区分. PM2.5平行样中各化学成分浓度偏差<15%.与其他装置相比,本研究介绍的再悬浮装置简便经济,具有较高的采样效率,在无组织尘排放源谱分析中具有较高的实用价值. |
| 英文摘要 |
| A resuspension chamber was developed and optimized to obtain PM2.5 fraction from fugitive sources. In accordance, a basic protocol of sampling and analysis was concluded. Replicate tests showed that mass deviation of PM2.5 between two sampling cascade impactors was less than 8% and size distribution ratios varied by no more than 5%, indicating good sampling parallelism and stability. Chemical profiles and size distribution of three kinds of fugitive dusts (paved road dust, secondary dust and ceramic industrial dust) as well as biomass burning emission had been measured based on the above chamber. The relative standard deviations (RSD%) of inorganic elements in duplicate PM2.5 samples were less than 15%. Comparing with other devices, the resuspension chamber described in this study features convenience and efficiency, and has a high practical value in the source sampling of fugitive dust. |
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