• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.271-272
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• 2003

다환방향족 탄화수소(PAHs)는 도시 대기입자상물질 중에 광범위하게 존재하고 있으며 그들의 발암성 및 변이성으로 인하여 건강과 관련하여 많은 주목을 받고 있다(Kado et at., 1996; Nielsen et al., 1996; Kao, 1994; Manzie et al., 1994). 다환방향족 탄화수소는 탄소나 수소를 함유한 유기물질의 불완전연소나 열분해에 의해서 생성된다. 연소과정에서 배출되는 다환방향족 탄화수소는 배출원에서 초기에 가스상태로 배출되나 상당량은 대기중의 입자상물질에 흡착된다. 산불이나 화산 등에서도 다환방향족 탄화수소에 기여하나 대기로 유입되는 대부분은 인위적인 배출원에서 배출된다. (중략)

• Publications of The Korean Astronomical Society
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• v.32 no.1
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• pp.93-95
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• 2017

The existence of polycyclic aromatic hydrocarbons (PAHs) astronomically is well accepted, but the specific molecular forms observed remain uncertain. To better understand the molecular structures which may be present along a given sightline, the $3.0-3.6{\mu}m$ region is modelled with careful consideration given to the underlying sub-features arising from specific structures within emitting molecules.

• Proceedings of the Korea Environmental Mutagen Society Conference
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• 2003.10a
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• pp.196-196
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• 2003

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.04a
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• pp.346-349
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• 2004

Surfactant-enhanced electrokinetic (EK) process was investigated to remove polycyclic aromatic hydrocarbons (PAHs) from low-permeable soils. Phenanthrene and kaolinite were selected as a representative PAH and a model soil, respectively. A nonionic surfactant Tergitol 15-S-12 was applied to improve the solubility of phenanthrene and sodium chloride was used as an electrolyte at the various concentrations from 0.001 to 0.1M. The addition of electrolyte affected both the removal efficiency and operation cost. When electrolyte was introduced, the electrical potential gradient became low and thus power consumption was reduced. However, as electrolyte concentration increased, the electroosmotic flow also decreased, so the removal efficiency of contaminant decreased. Therefore, the removal efficiency and power consumption should be considered simultaneously to determine the iptimum surfactant concentration, so a relatively lower concentration of electrolyte than certain value is desired.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2001.09a
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• pp.195-198
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• 2001

Bioremediation of hazardous hydrophobic organic compounds, such as polycyclic aromatic hydrocarbons (PAHs), is a major environmental concern due to their toxic and carcinogenic properties. Bue to their low solubility in water, the compounds are microbiologically persistent. This work investigates optimal conditions to enhance the biodegradation of phenanthrene in water and soil-slurry systems. Biodegradation tests were performed with three different types of supplements: glucose as a general carbon source, salicylate as an enzyme inducer, and Triton X-100 as a surfactant. The tests indicate that glucose and Triton X-100 were not very effective to increase biodegradation rate, even though the number of microorganisms are highly increased in the case of glucose addition. Salicylate accelerated biodegradation of phenanthrene, but the addition above optimal concentration inhibited microbial growth. Salicylate is considered to be an attractive alternative for the successful bioremediation of PAH-contaminated soil.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.04a
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• pp.340-343
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• 2003

Soils contaminated by hazardous hydrophobic organic compounds, such as polycyclic aromatic hydrocarbons (PAHs), have become a major environmental issue due to toxic and carcinogenic properties of those compounds. In this work, we investigated effects of various metabolic inducers on phenanthrene biodegradation. Biodegradation tests were peformed with two different Pseudomonads: Pseudononrdia hydrocarboxydans (Gram positive) and Pseudomonas putida (Gram negative). Intermediates of phenanthrene metabolism (1-hydroxy-2-naphthoate, salicylate, catechol, phthalate and protocatechuate) were selected as inducers. The tests indicated that 1-hydroxy-2-naphthoate was the most effective inducer and enhanced the phenanthrene degradation rate up to 5.7 times, even though all the others also had induction ability to some extent. The effective induction could be achieved even at a low concentration of 1-hydroxy-2-naphthoate. Addition of metabolic inducers would be an attractive trick for the successful bioremediation of PAH-contaminated soil.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.141-142
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• 2001

Liquid smoke is made by concentration of smoke generated from charcoal of broad-leaved trees, or by refinement of smoke originated from incomplete combustion of wood condensate (Park et al., 1994). Generally, it is well known that phenol and its derivatives have antioxidative effect, while acids and formaldehyde have antimicrobial effect (Park et al., 1994). Meanwhile, some studies (Alonge, 1988; Dungel, 1961) reported that the high incidence of stomach cancer has been associated with the consumption of smoked fishes, and these were investigated to direct intake of fishes treated with smoke, containing polycyclic aromatic hydrocarbons(PAHs)(Moret et al., 1999). (omitted)

• Proceedings of the Korea Environmental Mutagen Society Conference
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• 2002.05a
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• pp.136-136
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• 2002

• Journal of Korean Society for Atmospheric Environment
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• v.22 no.E2
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• pp.57-68
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• 2006

Four intensive seasonal sampling campaigns between October 1998 and October 1999 were undertaken at an urban site of Chongju, in which polyurethane foam (PUF) sampler was used to collect particulate- and vapor-phase polycyclic aromatic hydrocarbons (PAHs). The contribution to total (particulate+vapor) PAH concentration by the vapor phase component exceeded the particulate phase contribution by factor of ${\sim}2.6$. Summed concentrations of phenanthrene (30.9%), pyrene (16.6%), naphthalene (11.3%) and fluoranthene (11.0%) account for significant amounts of the vapor-phase, while chrysene (12.5%), benzo[b]fluoranthene (11.6%), indeno[123-cd]pyrene (9.9%), benzo[ghi]perylene (9.5%), benzo[k]fluoranthene (9.4%), pyrene (8.9%), and benzo[a]pyrene (8.3%) are found to be the most common PAH compounds in the particulate phase. The results from application of principal component analysis to particulate-phase PAH data demonstrate that a combination of PAH and $PM_{2.5}$ inorganic data is a more powerful tracer of emission sources than PAH species data alone. Particulate-phase PAH species were found to be associated predominantly with emissions from diesel engine vehicles and incineration.

• Journal of Environmental Science International
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• v.12 no.7
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• pp.775-782
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• 2003

The photodegradations of pyrene, chrysene and benzo[a]pyrene that were similar in structure among polycyclic aromatic hydrocarbons (PAHs) were investigated with a low-pressure mercury lamp(the wavelength of 253.7 nm and UV output of 1.35${\times}$10$\^$-3/J/s). The optimum concentrations of TiO$_2$ and H$_2$O$_2$ on the photodegradation of pyrene, chrysene and benzo[a]pyrene were 1 g/L and 1.5${\times}$10$\^$-3/ M, respectively. By these optimum concentrations, their rates increased with increasing the concentration of TiO$_2$ and H$_2$O$_2$ because the amounts of OH radical formed increased, but for the higher concentrations than the optimum, their rates decreased with increasing those concentrations because the white turbidity phenomena occurs in case of TiO$_2$ and H$_2$O$_2$ acts as an OH radical inhibitor. The photodegradation rates among the photodegradation processes such as UV, UV/TiO$_2$, UV/H$_2$O$_2$, and UV/H$_2$O$_2$/TiO$_2$ decreased in the following sequences.: UV/H$_2$O$_2$/TiO$_2$> UV/H$_2$O$_2$> UV/TiO$_2$> UV.