• Korean Journal of Fisheries and Aquatic Sciences
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• v.36 no.1
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• pp.44-48
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• 2003

Experiments were carried out to investigate the elimination of cadmium in tissues (gill, intestine, liver, kidney and muscle) of flounder, Paralichthys olivaceus, after sub-lethal Cd exposure (5, 50, 100 ${\mu}g/L$). During the depuration phase, Cd concentration in the gill decreased immediately following the end of the exposure period. The elimination rates at the end of depuration periods were $18\%$ for 50 ${\mu}g/L$ exposure and $70\%$ for 100 ${\mu}g/L$ exposure. Intestine showed fastest elimination rates of Cd at all concentration. At the end of the depuration period, the Cd concentration was similar to that in the control, Cd elimination in liver significantly decreased after 10 days of depuration period. After 20 days of depuration, the elimination rate was $66.20\%$ in the fish exposed to 50 ${\mu}g/L$ and $86.22\%$ in the fish exposed to 100${\mu}g/L$. The order of cadmium elimination in tissues were decreased intestine>liver${\geq}$gill>>kidney during depuration periods. In this study the gill, intestine and liver showed faster elimination rate of Cd in 50, 100 ${\mu}g/L$-Cd exposure concentration. After the end of the Cd exposure, the Cd concentration in the kidney slowly decreased or remained constant and the Cd concentration in the muscle slowly increased or remained constant.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.249-250
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• 2003

다이옥신류의 주된 생성원인은 쓰레기 소각장에서의 배출가스에 기인한다고 알려져 있다.$^{1,3,4)}$ 그 밖에 농약제조, pulp 제조과정에서 부산물로 생성되기도 하고, 자동차배가스도 다이옥신의 생성원인 중에 하나이다. Miyabara$^{5)}$ 등은 일본내 자동차 배출가스 입자중 다이옥신류의 농도는 4.2-242 pg I-TEQ/g이였으며, 일본에서 배출하는 다이옥신류의 약 0.3%에 달한다고 추정하였다. 도로변 퇴적물 둥에서의 다이옥신 농도는 자동차 배출가스 등으로부터 직ㆍ간접으로 많은 영향을 받고 있으며, 이들이 비산할 경우 운전자의 호흡기를 통해 건강에 직접적으로 영향을 미칠 수 있다.$^{2)}$ (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.87-88
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• 1999

최근 들어 서울을 중심으로 한 수도권 지역에서는 여름철 오존주의보 발령이 빈번해지면서 광화학 반응에 의한 대기중 오존농도 상승에 많은 관심을 보이고 있다. 휘발성 유기물질 (Volatile Organic Compounds)은 광화학 반응을 통해 오존을 생성시키는 대표적인 대기오염 물질로 알려져 있으며 주로 자동차, 석유정제, 석유화학, 도장산업 등에서 배출되는 것으로 알려져 있다. 이렇나 VOC는 $NO_x$와 함께 대기중 오존농도 저감을 위한 대상물질로써 NOx 배출량 규제와 동시에 VOC 농도 및 특성 또한 면밀히 검토되어야 한다.(중략)

• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.2
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• pp.137-143
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• 2011

This paper describes the effects of biodiesel blended fuel on the engine combustion and emission characteristics in a four cylinder CRDI(Common-rail direct injection) diesel engine. In this work, the biodiesel-diesel blended fuel(20% of biodiesel and 80% of ULSD(ultra low sulfur diesel) by volume ratio, BD20) and ULSD fuel are used under the various injection pressures and engine speeds. The experimental results of BD20 and ULSD fuel show that NOx emissions were increased and soot emissions were decreased with the increase of injection pressure. In particular, NOx emissions were slightly increased for the BD20 fuel, however, soot emissions were significantly reduced compared to the ULSD fuel. When the engine speed is increased from 1000rpm to 2000rpm, NOx emissions are decreased at all tested conditions, and soot emissions are largely increased at lower injection pressure.

• Spatial Information Research
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• v.6 no.1
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• pp.65-76
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• 1998

Air contaminant density must be inferred exactly to manage air pollution. Each land use of air pollution source is duplicated in the existing air contaminant distribution because the resolution of the land use map is low. The purpose of this study is to understand how the land use map is used to determine effectively in the distribution calculation of the emission volume and the inference of air contaminant density, as it is made in a high resolution. The major findings are as follows : In this study, as to making a high resolution($28.5m{\times}28.5m$) map of land use with GIS, each air pollution source is not duplicated spatially and land use can be reflected effectively. In Seoul, each air contaminant density was inferred (using a TCM-2 model) with the existing distribution map of emission volume, whose resolution is $1km{\times}1km$, and the new distribution map of emission volume, whose resolution is $28.5km{\times}28.5km$. According to the result, the inference value of the new distribution map was more similar to the actual value of an automatic survey network.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.04a
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• pp.65-66
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• 2002

대도시 오존농도의 저감을 실현시키기 위한 가장 중요한 과제로 오존의 생성과 관련 있는 전구물질(precursor)에 대한 제어과정이 대두됨에 따라 주요 배출원 중 자동차배출 VOCs에 대한 정확한 총 배출량을 파악하고, VOCs의 각 성분별 배출구성비를 파악하는 것은 오존생성반응을 모사ㆍ예측하고 대기 중 오존 오염을 제어하는데 있어서 필수적이라 하겠다. 그러나 국내에서는 자동차등 이동오염원에 대한 배출실태조사가 이루어지지 않아 배출원 관리에 어려움이 있는 실정이다. (중략)

• Bulletin of Korea Environmental Preservation Association
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• v.6 no.1
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• pp.46-48
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• 1984

• Bulletin of Korea Environmental Preservation Association
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• v.6 no.4
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• pp.32-35
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• 1984

• Analytical Science and Technology
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• v.14 no.5
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• pp.422-431
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• 2001

One pulp manufacture facility was selected as surveying facility to examine the discharged amount and generation mechanism of dioxins excepts for bleaching stage wastewater. In recovery and finishing process, 2,3,7,8-TCDF, OCDD and OCDF were mainly detected, and the ratio of PCDDs and 1,2,3,4,7,8-HxCDD as the concentration of 2,3,7,8-substitute isomer were discharged which is known as the typical emission pattern of pulp and paper manufacture facility, and the 1,2,3,7,8-PeCDD and 1,2,3,4,7,8-HxCDD were discharged more than 90% in toxic equivalent concentration. Also, the OCDD and 2,3,7,8-TCDF for 2,3,7,8-isomer concentration, and 1,2,3,7,8-PeCDD and 2,3,7,8-TCDF as toxic equivalent concentration were discharged in effluent. The detected PCDDs/PCDFs concentration were surveyed 0.2266 ng-TEQ/L for influent and 0.0377 ng-TEQ/L for effluent.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.11a
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• pp.197-199
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• 2000

오존은 배출원에서 직접 배출되는 1차 오염물질이 전구물질들이 강한 태양광선에 의해 광화학 반응을 일으켜 생성되는 2차 광화학 오염물질이다. 대표적인 전구물질로는 질소산화물(NOx)과 휘발성유기화합물(VOC)이다. 이러한 전구물질들은 화석연료의 연소와 자동차에서 직접 배출되어 대기 중에서 복잡한 물리ㆍ화학과정을 통하여 오존을 생성한다. 최근에 도심 지역 및 주변지역 그리고 몇몇 시골지역에서 발생하고 있는 오존의 고농도 현상은 중요한 대기오염 문제중의 하나로 부각되고 있다. (중략)