Air Quality Monitoring Of Memphis And Surrounding Areas

3641 Words Dec 5th, 2014 15 Pages
Air Quality Monitoring in Memphis and Surrounding Areas in 2014, Analyzed by Gas Chromatography/Mass
Spectrometry (GC/MS)
By Ebtsam Seteh

Abstract
Volatile organic compounds (VOCs) in the atmosphere have been determined to be a human risk factor in urban, suburban, and industrial environments. This study aims to characterize the distribution and concentrations of ambient air toxics in Memphis and identify major sources of VOCs. During four seasons in 2014, about 530 ambient air samples have been collected in various locations in Memphis and surrounding areas for the analysis of VOCs with the TO-15 method. GC-MS was used with a preconcentrator outfitted with a glass bead trap and a Tenax trap in cryogenic mode to analyze the VOCs in scan and/or SIM mode. The ambient air monitoring data showed that there were about 30 compounds that do not belong to the list of TO-15 target compounds that necessitate the preparation of calibration standard mixtures of these non-TO-15 compounds. These include cyclohexene, 3/4-chlorocyclohexene, cyclohexanone, C6-C10 aldehydes, dimethyldisulfide, dimethyltrisulfide, acetonitrile, and 2-cyclohexen-1-one. The improvement in the analytical sensitivity of the non-TO-15 compounds via SIM mode analysis of their fragment ions at specific m/z ratios will be presented. The comparison of non-TO-15 compounds in their concentration levels and emission sources will be highlighted in this project. Also, the Toxics Release Inventory of emission…
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