| 膜采样离线分析与在线测定大气细粒子中元素碳和有机碳的比较 |
| 摘要点击 4234 全文点击 2407 投稿时间：2007-12-01 修订日期：2008-01-22 |
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| 中文关键词 碳质气溶胶 有机碳 元素碳 细粒子 |
| 英文关键词 carbonaceous aerosol organic carbon elemental carbon fine particle |
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| 中文摘要 |
| 针对普遍采用的膜采样离线分析与在线测定大气细粒子中元素碳和有机碳的方法进行了比较分析. 2006年1月～2007年4月期间在北京大学校园内应用膜采样离线分析和在线分析分季节同时测定了PM2.5中元素碳（EC）和有机碳（OC），并将结果进行对比.结果显示，膜采样法测得的OC约为在线仪器测得的OC的2倍， 2种方法差别主要体现在对OC的测量上.不加平行板有机物扩散吸收管引入OC比较大的正误差，而加平行板有机物扩散吸收管又将引入OC的负误差，约10%.同时采用平行板有机物扩散吸收管和后置膜的离线分析方法同在线观测的结果具有比较好的一致性. |
| 英文摘要 |
| Elemental carbon（EC） and organic carbon (OC) in PM2.5 were measured simultaneously at the campus of Peking University from January 2006 to April 2007 by two common used methodologies. One is quartz filter sampling followed by off-line SUNSET Lab EC/OC analyzer and the other is SUNSET in-situ on-line EC/OC analyzer. The comparison shows significant differences on OC measurements between the two methods. The results by filter sampling off-line analysis were as twice high as those by in-situ on-line method. The volatile organic carbons (VOCs) adsorbed by quartz filter led to considerable positive error of OC. The use of parallel plate organic denuder can eliminate such error but cause the evaporation of semi-volatile organic carbon on the filter which induces another negative error of OC, about 10%. The improved method of filter sampling off-line analysis using both parallel plate organic denuder and backup filter has a good agreement with in-situ online measurement. |
