Abstract Studies of relative performance of SPME-based analysis of VOC and some odorous compounds and field measurements VOC emission characteristics at the Ban Wall Industrial Complex Moon-Soon Im Department of Earth and Environmental Sciences The Graduate School of Sejong University This thesis co...
Abstract Studies of relative performance of SPME-based analysis of VOC and some odorous compounds and field measurements VOC emission characteristics at the Ban Wall Industrial Complex Moon-Soon Im Department of Earth and Environmental Sciences The Graduate School of Sejong University This thesis consists of the two major subjects for VOC analysis. The first part covers the results of laboratory-based experiment study. The second part of the study covers an intensive field investigation to measured VOC emissions. In the fist part of study, the performance characteristics of solid phase microextraction (SPME) were investigated for three major odorous groups that consist of 10 individual compounds ([1] volatile organic compounds (VOC): benzene, toluene, p-xylene and styrene, [2] reduced sulfur compounds (RSC): hydrogen sulfide, methyl mercaptan, dimethylsulfide (DMS), dimethyldisulfide (DMDS), and carbon disulfide, and [3]amine: trimethylamine (TMA)). For the purpose of a comparative analysis, two types of SPME fiber ([1] polidimethylsiloxane/divinilbenzene (P/D) and [2] CarboxenTM/ polidimethylsiloxane (C/P)) were tested against each other for a series of standards prepared at different concentration levels (100, 200, and 500 ppb). To compare the analytical performance of each fiber, all standards were analyzed for the acquisition of calibration data sets for each compound. The results of P/D fiber generally showed that its calibration slope increased as a function of molecular weight across different VOCs; however, those of C/P fiber showed a fairly reversed trend. Besides, we confirmed that the application of SPME is not directly applicable to many sulfur compounds. Only two sulfur compounds (DMS and DMDS) out of five tested compounds were sensitive enough to draw calibration results. The calibration data for RSC showed generally enhanced slope values for C/P relative to P/D fiber. However, in the case of TMA, we were not able to find a notable difference in their performance. In the second part of study, the emission characteristics of volatile organic compounds (VOC), produced and released from anthropogenic source process have been investigated. In this study, we collected the emission concentration of VOC from a total of 197 samples collected from 77 companies (representing 19 types of industry) at Ban Wall industrial complex (Jun. 2004 to Oct. 2006). Through a statistical analysis of these measurement data, we inspected the emission characteristic of VOC in relation with industrial type and treatment unit. When these data were compared each other, toluene was found to record the highest value of 7,580±78,490 (46.2: median) ppb followed by styrene (3,279±22,490 (2.78) ppb), ethylbenzene (373±3,326 (9.08) ppb), m,p-xylene (88.4±512 (8.42) ppb), and benzene (53.0±608,940 (1.24) ppb), In addition, by converting these VOC concentration data into malodor intensity, we attempted to account for their distribution patterns in terms of relative contribution to malodor strength. The results of odor intensity conversion generally indicated that mainly 4 compounds (toluene, styrene, m,p-xylene, 1,2,4-trimethylbenzene) are important as the odorous compounds Despite relative insignificance as odorous compounds, these VOCs are generally found ubiquitously and in abundant quantities in this strong source area.
Abstract Studies of relative performance of SPME-based analysis of VOC and some odorous compounds and field measurements VOC emission characteristics at the Ban Wall Industrial Complex Moon-Soon Im Department of Earth and Environmental Sciences The Graduate School of Sejong University This thesis consists of the two major subjects for VOC analysis. The first part covers the results of laboratory-based experiment study. The second part of the study covers an intensive field investigation to measured VOC emissions. In the fist part of study, the performance characteristics of solid phase microextraction (SPME) were investigated for three major odorous groups that consist of 10 individual compounds ([1] volatile organic compounds (VOC): benzene, toluene, p-xylene and styrene, [2] reduced sulfur compounds (RSC): hydrogen sulfide, methyl mercaptan, dimethylsulfide (DMS), dimethyldisulfide (DMDS), and carbon disulfide, and [3]amine: trimethylamine (TMA)). For the purpose of a comparative analysis, two types of SPME fiber ([1] polidimethylsiloxane/divinilbenzene (P/D) and [2] CarboxenTM/ polidimethylsiloxane (C/P)) were tested against each other for a series of standards prepared at different concentration levels (100, 200, and 500 ppb). To compare the analytical performance of each fiber, all standards were analyzed for the acquisition of calibration data sets for each compound. The results of P/D fiber generally showed that its calibration slope increased as a function of molecular weight across different VOCs; however, those of C/P fiber showed a fairly reversed trend. Besides, we confirmed that the application of SPME is not directly applicable to many sulfur compounds. Only two sulfur compounds (DMS and DMDS) out of five tested compounds were sensitive enough to draw calibration results. The calibration data for RSC showed generally enhanced slope values for C/P relative to P/D fiber. However, in the case of TMA, we were not able to find a notable difference in their performance. In the second part of study, the emission characteristics of volatile organic compounds (VOC), produced and released from anthropogenic source process have been investigated. In this study, we collected the emission concentration of VOC from a total of 197 samples collected from 77 companies (representing 19 types of industry) at Ban Wall industrial complex (Jun. 2004 to Oct. 2006). Through a statistical analysis of these measurement data, we inspected the emission characteristic of VOC in relation with industrial type and treatment unit. When these data were compared each other, toluene was found to record the highest value of 7,580±78,490 (46.2: median) ppb followed by styrene (3,279±22,490 (2.78) ppb), ethylbenzene (373±3,326 (9.08) ppb), m,p-xylene (88.4±512 (8.42) ppb), and benzene (53.0±608,940 (1.24) ppb), In addition, by converting these VOC concentration data into malodor intensity, we attempted to account for their distribution patterns in terms of relative contribution to malodor strength. The results of odor intensity conversion generally indicated that mainly 4 compounds (toluene, styrene, m,p-xylene, 1,2,4-trimethylbenzene) are important as the odorous compounds Despite relative insignificance as odorous compounds, these VOCs are generally found ubiquitously and in abundant quantities in this strong source area.
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