• Analytical Science and Technology
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• v.13 no.1
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• pp.72-80
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• 2000

The HS/GC/MS method was performed to analyze the volatile organic compounds in waste sludge samples. This study was performed to establish the fundamental data by studying the effects of salt, equilibrium temperature and time in the volatile organic compounds analysis. The presence of salts have been found to increase the sensitivity. The peak area is increased from 1.07 to 2.61 times by adding the salts to the water sample, compared with a salt tree sample. The recoveries of target compounds have found between 90% and 127% at sample temperature of $85^{\circ}C$ for 30 min. This HS/GC/MS method can be applied to analyze the volatile organic compounds and organohalo compounds in the environmental matrix.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.04a
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• pp.211-213
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• 1999

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1997.10a
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• pp.224-224
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• 1997

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1997.10a
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• pp.196-197
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• 1997

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2002.11a
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• pp.330-331
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• 2002

급격한 도시화와 산업화는 필연적으로 화석연료의 사용량 증가를 초래하였고 적절한 제어 대책이 마련되지 않는 한 결과적으로 인구가 집중된 도시 지역에서는 각종 대기 오염물질과 함께 환경 대기중의 휘발성 유기화합물(Volatile Organic Compounds VOCs)의 농도도 직접 혹은 간접적으로 증가하고 있다. VOC는 스모그 형성의 주요 원인물질인 오존의 전구물질일 뿐만 아니라 현재개선이 되지 않고 있는 시정 장애와 관련이 있는 물질이고 최근 수치상의 대기질 개선에도 불구하고 실제 피부로 느껴지게 하는 주요 원인물질이다. (중략)

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.5
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• pp.917-920
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• 2004

The migration potential of volatile organic solvents widely employed in the printing process of food packaging was investigated by using a closed experimental system, which contained a food sample and a paper sheet spiked with the contaminant solvents. The studied organic compounds included toluene and p,m,o-xylene which are relatively highly volatile. Typical food samples of caramel, beef jerky and butter were selected based on their chemical composition and were assigned to the migration system at 10, 25 and 4$0^{\circ}C$. The equilibrated migration level was very high with almost complete transfer in the butter with high fat, while caramel of high carbohydrate content and beef jerky of high protein showed migration degree of 37∼56% and 37∼77%, respectively. Temperature did significantly influence the migration on beef jerky with higher level at higher temperature. There was no difference in the migration level among the solvents.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.383-384
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• 1999

도시대기 중의 광화학 대기오염의 원인인 동시에 사람의 건강상에 유해한 성분(발암성 혹은 돌연변이성)들이 많이 존재하는 것으로 알려진 대기오염물질 중에서도 탄화수소성분에 대한 관심이 최근들어 고조되고 있다. 메탄을 제외한 탄화수소성분을 총칭하여 비메탄계 탄화수소(NMHC)라고 일컫고 있으며, 비메탄계 탄화수소는 알데히드등의 산소화합물을 함유하고 있지 않지만, 휘발성 유기화합물(Volatile Organic Compounds;이하 VOCs)은 산소함유화합물을 포함한 물질을 말한다.(중략)

• Clean Technology
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• v.13 no.4
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• pp.281-286
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• 2007

VOCs from the heat recovery ventilation system (total heat exchanger) are measured in this study. Two different types of element (L and M type) from heat recovery ventilating system are tested to study the intial release characteristics of VOCs under KS cooling and heating standard conditions. VOCs are measured for the various flow rates and different operating times. Considering errors in the test method and the measuring instrument, the tested heat recovery ventilating systems was found to release 6 major VOCs, such as acetic acid, 2-butanone (MEK), 2-(methylthio )ethylamine, toluene, styrene, and x-acids (Ion 57). The concentrations of released VOCs are not quite much affected by operating conditions. The results show much larger VOCs concentrations in the cooling mode than in the heating mode, due to the high operating temperatures.

• Membrane Journal
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• v.9 no.1
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• pp.51-62
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• 1999

The recovery of trace volatile organic components from water by pervaporation was investigated. Permeation experiments through homogeneous polydimethylsiloxane(PDMS) membrane was carried out and the effect of feed concentrations and membrane thicknesses on the permeation characteristics were investigated. A solution-diffusion model is used to describe the pervaporation transport mechanism. In homogeneous PDMS membrane it appeared that the selectivities of MEK and toluene are constant, and that organic flux has a linear relationship with feed concentration. These results indicate that the coupling effects between organics were negligible. The selectivity of PDMS membranes is invariant with respect to the membrane thickness. The intrinsic membrane permeability of organic components determined by using a solution-diffusion model. Comparing with various composite type membrane, the membrane using PEG treated nonwoven fabric as sublayer showed the best performance in VOC recovery by pervaporation.

• Applied Chemistry for Engineering
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• v.16 no.5
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• pp.719-723
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• 2005

Organic-inorganic hybrid mesoporous materials were prepared by co-condensation of organosilanes with tetraethyl orthosilicate (TEOS) or 1,2-bis(triethoxysilyl) ethane (BTSE). Their removal capability of volatile organic compounds (VOCs) in the air was evaluated and compared with that of inorganic hydrophilic mesoporous material, SBA-15 that was prepared with TEOS only. It was found that the increased hydrophobicity of mesoporous materials due to the presence of organic group, could enhance the VOCs removal by adsorption in the air. An organic-inorganic hybrid material prepared by the co-condensation of BTSE/phenyl triethoxysilane (90/10 by weight) was a typical example of superior adsorbent. It was also observed that these organic-inorganic hybrid materials can be utilized as absorbents for the removal of oil dispersed in water.