3.2. Species compositions of VOC emissions
The VOC mass concentrations in the source samples varied significantly, probably due to different emission strength or leakage from the process units. The results were expressed as weight fraction of each species relative to the total VOC concentrations to illustrate the possible differences in composition patterns of the measured samples. In this work, the measured concentration of each species was normalized to the total VOC concentration in the source sample to develop individual profiles for each process unit. As shown in Fig. 2, the VOC species detected were categorized into four functional groups, namely, alkanes, alkenes and alkynes, aromatics, and halocarbons, to compare the overall patterns of VOC chemical groups among different process units.
3.2 3.2. Species compositions of VOC emissions
The VOC mass concentrations in the source samples varied significantly, probably due to different emission strength or leakage from the process units. The results were expressed as weight fraction of each species relative to the total VOC concentrations to illustrate the possible differences in composition patterns of the measured samples. In this work, the measured concentration of each species was normalized to the total VOC concentration in the source sample to develop individual profiles for each process unit. As shown in Fig. 2, the VOC species detected were categorized into four functional groups, namely, alkanes, alkenes and alkynes, aromatics, and halocarbons, to compare the overall patterns of VOC chemical groups among different process units.
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