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안산시 주거지역을 중심으로 한 환경대기 중 휘발성 유기화합물과 황계열 성분의 온라인 연속측정 연구
김기현,주도원,최여진,홍윤정,사재환,박종호,전의찬,최청렬,구윤서,Kim K.-H,Ju DW,Choi YJ,Hong YJ,Sa JH,Park JH,Jeon EC,Choi CR,Koo YS 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1
In this study, the concentrations of major odorous compounds including reduced sulfur compounds (OMS, CS$_2$, and DMDS) and aromatic VOC (benzene, toluene, xylene, etc.) were measured continuously using an on-line GC analytical system. Our measurements were made from a residential area of Ansan sity during about two week period of October, 2004. The highest mean concentrations of Sand VOC were found as 56.9 pbb of DMS and 21.7 ppb of toluene, respectively. The results of this study generally show that the pollution levels for both types of chemicals are significant relative to previous measurement results reported from comparable sites, if the results are compared simply in terms of the magnitude of the measured concentration data. Moreover, when the relative importance of different compounds is compared in terms of the odor strength, it indicated that the contribution of reduced S compounds may be much more important than that of VOC in the study area.
임문순(MS Im),김기현(KH Kim),최여진(YJ Choi),전의찬(EC Jeon) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.2
The emission concentrations of VOC and various odorous compounds were measured from different indoor process units located in 19 companies at the Ban Wall industrial complex from Jun. 2004 to Jan. 2005. The purpose of this study was to investigate the indoor pollution levels of various industrial facilities with respect to bothmalodorous compounds and volatile organic compounds (VOC). We also intended to build the database under the conditions affected by various anthropogenic processes with an aid of a statistical treatment. The three samplingmethods and five analytical techniques were applied tomeasure the sum of up to 32 individual compounds. According to this study, we were able to identify the importance ofmajormalodor compounds which include carbonyl compounds, reduced sulfur compounds, ammonia and trimethylamine. On the other hand, relative contribution of VOC as sources ofmalodor was ofminor significance except such compound as toluene. The overall results of this study thus indicate that the concentration levels of VOC in themanufacturing facilities are high enough to affect indoor laboring conditions.
환경 대기 중 ppt 수준의 황화수소 분석을 위한 GC 방식의 검량 기법에 대한 연구
김기현,오상인,최여진,최규훈,주도원 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.6
In this study, we investigated the analytical techniques to quantify the ambient concentration of hydrogen sulfide (H₂S) in air at ppt concentration level. For this purpose, an on-line GC analytical system equipped with both pulsed -flame photometric detector (PFPD) and thermal desorption unit (TDU) was investigated by collecting ambient air samples. The results of our study generally indicated that calibration conditions of GC system is highly sensitive to affect the accuracy of the analytical technique. Most importantly, we found that the use of different matrices in the the preparation stage of working standards was sensitive to control the overall performance of this technique. The calibration of our analytical system was tested by the two types of working standard (prepared by mixing either with high purity N₂or with the ambient air). According to this test, the latter represented more efficiently the detecting conditions of actual air samples. The peak occurrence patterns of both air samples and standards (prepared by mixing with ambient air) were altered in a similar manner as the function of the loaded volume; however, it was not the case for the N₂-mixed standards. Results of our study suggest that detection of H₂S is highly different from other sulfides and that its quantification requires minimizing interfering effects of non -pure substance (like water vapor) and (either sorptive or destructive) loss effects.
환원황 화합물을 중심으로 한 매립가스의 조성에 대한 연구
김기현,오상인,최여진,전의찬,사재환,선우영 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.1
In this study, the concentrations of reduced S compounds (including hydrogen sulfide (H₂S); methyl mercaptan (CH₃SH); dimethyl sulfide ((CH₃)₂S); carbon disulfide (CS₂); and dimethyl disulfide ((CH₃)₂S) were determined from landfill gas (LFG) in three municipal landfill sites in the two cities of Gwang Ju (GJ) and Jeju (JJ), Korea. The S gas concentrations measured in these landfill sites were found to be dominated by H₂S with its mean concentration of 850 ppm from 10 LFG samples. Both absolute and relative dominance of H₂S was seen to be significant in most LFG samples, except those collected from very old and inactive landfills. Unlike the pattern of H₂S, other S gases were typically observed at much reduced concentration levels (a few ppm or less) as follows: DMS (3.5); CH3SH (1.3); CS2 (1.2); and DMDS (0.02 ppm). If compared equally in mass concentration unit (mg m-3), H2S generally explained far above 90% of all S gas masses determined concurrently. Moreover, as its mass concentration commonly exceeds those of the major aromatic VOC components in LFG (like benzene and toluene), it appeared to be one of the most dominant gaseous components emitted as LFG in a quantitative sense.