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Continuous Measurements of Reduced Sulfur Gases in Urban Air  

Choi Ye-Jin (세종대학교 지구환경과학과 대기환경연구실)
Kim Ki-Hyun (세종대학교 지구환경과학과 대기환경연구실, 경희대학교 환경연구센터)
Oh Sang-In (세종대학교 지구환경과학과 대기환경연구실)
Shon Zang-Ho (동의대학교 환경공학과)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.20, no.2, 2004 , pp. 195-204 More about this Journal
Abstract
In this study, the concentrations of major reduced sulfur compounds (H$_2$S, $CH_3$SH, DMS, and DMDS) were determined from ambient air in a monitoring station located in the mid-eastern area of Seoul. Measurements of sulfur species were conducted by the combination of on -line air sampling, thermal desorption, and capillary GC/PFPD analysis. A total number of 143 hourly samples were collected in the two time periods set between June and July 2003. The mean concentrations of four sulfur species measured in the whole study period were found on the order: DMS (535$\pm$183) > H$_2$S (47$\pm$10) > DMDS (35$\pm$22) > $CH_3$SH (6.19$\pm$29.4 pptv). The results of this study show that the concentrations of DMS at the study area are generally higher than those reported previously in the oceanic environments, while those of other sulfur species are not easy to compare with due to the lack of data. The H$_2$S concentrations were generally higher during the daytime than the nighttime, whereas those of others generally exhibited a reversed diurnal pattern. The overall results of our study suggest that the distribution of major reduced S compounds should be controlled by diverse processes in the urban area.
Keywords
Hydrogen sulfide; Sulfur gas; GC; Malodor; Ambient air; Thermal desorption unit(TDU);
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