Advantages of continuous non-methane organic carbon monitoring over direct fid analysis

摘要

The most commonly used continuous emission monitor for volatile organic emissions in stationary sources is the total hydrocarbon analyzer which is a Flame Ionization Detector (FID). The limitations of this technique is that that FID has different response factors for different functional groups, as a result its response is not proportional to the total carbon content of the air emissions. Moreover it also responds to CH4 which is often not considered a serious threat to public health. Nonmethane organic carbons (NMOC) is a measure of total organic carbon except that from methane. EPA standard method 25 is used to meausre NMOC emission from stationary sources. In this paper we discuss the development of a novel instrument for continuous on-line monitoring of NMOC in emission sources as well as in ambient air and compare its performance with direct FID analysis.