Hu Min, Deng Zhi-qiang, Wang Yi, Lin Peng, Zeng Li-min, Yutaka Kondo, Zhao Yong-jing
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Huan Jing Ke Xue. 2008 Dec;29(12):3297-303.
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.
2006年1月至2007年4月期间，采用两种常用方法在北京大学校园内同时测量了PM2.5中的元素碳（EC）和有机碳（OC）。一种是石英滤膜采样后离线使用SUNSET实验室EC/OC分析仪进行分析，另一种是SUNSET原位在线EC/OC分析仪。比较结果显示，两种方法在OC测量上存在显著差异。滤膜采样离线分析的结果是原位在线方法结果的两倍。石英滤膜吸附的挥发性有机碳（VOCs）导致OC出现相当大的正误差。使用平行板有机除油器可以消除这种误差，但会导致滤膜上的半挥发性有机碳蒸发，从而引发OC的另一个负误差，约为10%。同时使用平行板有机除油器和备用滤膜的滤膜采样离线分析改进方法与原位在线测量结果吻合良好。
