AI Article Synopsis
- The study was conducted at Peking University to measure elemental carbon (EC) and organic carbon (OC) in PM2.5 using two common methodologies over a period from January 2006 to April 2007.
- The results indicated that the off-line quartz filter sampling method reported OC levels that were about twice as high as those measured by the in-situ online method, primarily due to the adsorption of volatile organic compounds on the filter causing measurement errors.
- By incorporating a parallel plate organic denuder and backup filter into the off-line analysis, the study found that this improved method provided results that aligned closely with the in-situ measurements, reducing the errors previously encountered.
Article Abstract
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.
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