The research in this paper was carried out to examine the BTEX(Benzene, Toluene, Ethylbenzene, Xylene) concentrations in Seongseo Industrial Complex. These compounds are the major constituents, more than 60% in composition of total VOCs, mainly charging in ambient air. BTEX samples were collected from the 38 sites, 10 for the source points and 18 for the boundary sites, and were analyzed by canister-GC/MS. The mean concentrations of BTEX were 33 ppbv for benzene, 214 ppbv for toluene, 89 ppbv for ethylbenzene, 77 ppbv for xylene. Among the BTEX, toluene had the highest concentration in the source points and boundary sites. In the source points, BTEX concentration of incineration facility for hazardous wastewater appeared highly in the range of 220~350 ppbv. BTEX concentrations in source boundary sites appeared in the order of toluene>ethylbenzene>xylene>benzene. As a result of the correlation analysis, the concentration of the source points was related to those of the boundary sites. Correlation of ethylbenzene and xylene was presented to 0.7991(P<0.01), 0.6329(P<0.05) as the correlation coefficient, respectively.
The importance of atmospheric conditions for the assessment of an air pollution situation has been demonstrated by their influence on the various compartments of an air pollution system, comprising all stages from emission to effects. Especially, air pollutants dispersion phenomenon are very sensitive according to wind data. But the discussions of how to apply representative meteorological data in air pollution dispersion model are not frequent in Korean environmental assessment processes.
In this study, we investigated the difference of air pollutants dispersion phenomenon using U.S EPA ISCLT3 model according to applying the different meteorological data observed at two points for Seongseo industrial complex of Daegu. Two points are the spot site of Seongseo industrial complex and Daegu meteorological observatory.
The winds speed of the spot site were smaller than those of Daegu meteorological observatory. In the winter season, the differences came to about 64% for the period(1 February 2001~31 January 2002). Wind directions were also fairly different at two points. The air pollutants dispersion phenomenon estimated from our numerical experiments were also fairly different owing to the meteorological conditions at two points.
As a typical example of simultaneous analysis of the odorous compounds, the volatile organic compounds from inventory sources in Seongseo industrial area were concentrated and analyzed with thermal desorber/GC/ MSD, and major malodorous compounds were estimated. Odor intensity and odor concentration was analyzed simultaneously During a period from November in 2002 to December in 2003, this study was conducted to evaluate malodor emission characterization in major treatment facilities. The major components were Dimethyl sulfide, Dimethyl disulfide, Methyl mercaptane, Ammonia, Benzene, Toluene, m,p-xylene, o-xylene, Styrene, 1,2,4- T.M.B and 1,3,5-T.M.B. Among the six major inventory sources, the odor unit concentration of Night-soil disposal facilities was the highest, 669~2344 ou/m3.
본 논문의 목적은 외항선사들의 정치적 노출정도를 측정하는 정치적 비용과 이와 관련이 있는 재무적 요인들 간의 관련성 유무를 다변량 회귀분석방법에 의하여 실증 분석함으로써 우리나라 해운산업의 정치적 비용 결정요인을 검증하는 데 있다. 회귀모형의 독립변수는 기업규모(매출액, 총자산, 시장점유율) 외에 해운산업의 특성을 보여주는 부채비율, 자본집약도, 영업이익률 및 해운위험으로서 매출액변동이다. 분석 결과 해운기업의 정치적 비용과 모든 규모변수는 유의적으로 정의 관련성이 있는 것으로 나타나고 있다. 또한 부채비율과 영업이익률은 해운산업의 정치적 비용을 결정하는 주요 요인으로 밝혀졌다.