http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effect of Organic Matters on CO<sub>2</sub> Hydrate Formation in Ulleung Basin Sediment Suspensions
Lamorena, Rheo B.,Kyung, Daeseung,Lee, Woojin American Chemical Society 2011 Environmental science & technology Vol.45 No.14
<P>Marine sediment core samples collected from a gas hydrate deposit site (Ulleung Basin (UB), East Sea, Korea) were explored to identify the role of sediment organic matters (SOMs) on the formation of CO<SUB>2</SUB> hydrate. Two distinct CO<SUB>2</SUB> hydrate formation regimes (favorable (≤40 min) and unfavorable (>250 min)) were observed from the hydrate formation tests. CO<SUB>2</SUB> hydrate induction time in UB sediment suspensions was approximately seven times faster than that in UB sediment suspensions without SOMs (baked UB), showing a direct influence of SOMs. Spectrometric and spectroscopic analyses confirmed the existence of different types of SOMs including nonhumic and humic substances in UB sediment samples. We found SOMs with aromatic ring structures in all sediment extracts and SOMs with amine and amide groups and lignin in alkaline extracts. SOMs were extracted from UB sediment core samples (1 g each). Measured CO<SUB>2</SUB> hydrate induction times were different in baked UB sediment suspensions with different extracts of UB sediments. The experimental results demonstrated that SOMs can play a significant role to accelerate the formation of CO<SUB>2</SUB> hydrate in UB sediment suspensions, suggesting that the gas hydrate deposit site at UB may be a proper place for CO<SUB>2</SUB> sequestration as a form of CO<SUB>2</SUB> hydrate.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2011/esthag.2011.45.issue-14/es201261y/production/images/medium/es-2011-01261y_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es201261y'>ACS Electronic Supporting Info</A></P>
Rheo B. Lamorena,Su Mi Park,Gwi Nam Bae,Woo Jin Lee 대한환경공학회 2007 Environmental Engineering Research Vol.12 No.2
Experiments were conducted to identify the emissions from the car air freshener and to identify the formation of ultra-fine particles and secondary gaseous compounds during the ozone-initiated oxidations with emitted VOCs. The identified primary constituents emitted from the car air freshener in this study were α-pinene, β-pinene, ρ-cymene and limonene. Formation of ultra-fine particles (4.4 - 160 nm) was observed when ozone was injected into the chamber containing emitted monoterpenes from the air freshener. Particle number concentrations, particle mass concentrations, and surface concentrations were measured in time dependent experiments to describe the particle formation and growth within the chamber. The irritating secondary gaseous products formed during the ozone-initiated reactions include formaldehyde, acetaldehyde, acrolein, acetone, and propionaldehyde. Ozone concentration (50 and 100 ppb) and temperature (30 and 40℃) significantly affect the formation of particles and gaseous products during the ozone-initiated reactions. The results obtained in this study provided an insight on the potential exposure of particles and irritating secondary products formed during the ozone-initiated reaction to passengers in confined spaces.
The Secondary Products by Ozone-initiated Reaction with Terpenes Emitted from Natural Paint
정상근,Rheo B. Lamorena,이우진,배귀남,문길주,김신도 한국실내환경학회 2004 한국실내환경학회지 Vol.1 No.1
The use of natural paint for the application to walls and furnishings is now increasing to improve indoor air quality, thereby the natural paint could be a significant source of biogenic volatile organic compounds(BVOCs) in indoor environments. Recent studies have shown that gas-phase reactions between terpenes and ozone can generate sub-micron size particles and toxic volatile organic compounds such as aldehydes and ketones. In this research, we have studied the formation of particles and secondary organic compounds during the reaction of ozone with terpenes emitted from commercial natural paint. The paint applied onto stainless steel was dried and oxidized in a Teflon chamber. Two monoterpenes(α- and β-pinenes) were identified by FTIR and GC/MS. Several tests were performed to evaluate the effects of ozone concentration on particle formation. Increased ozone levels significantly affect the increase of particle number concentration(monitored with SMPS), which results in the increase of particle counts ranging from 8,000 to 70,000 particles/cm3. Gas-phase products such as formaldehyde, acetaldehyde, acetone + acrolein, and propionaldehyde were identified during the terpene/ozone reactions by HPLC. These compounds are potential hazardous chemical compounds having harmful health effects to animals and plants. The results obtained from this study provide an insight on the adverse effect of eco-friendly natural product on indoor air quality(IAQ).
Sang-Guen Jung(정상근),Rheo B. Lamorena, Woo Jin Lee(이우진),Gwi-Nam Bae(배귀남),Kil-Choo Moon(문길주),Shin-Do Kim(김신도) 한국실내환경학회 2004 한국실내환경학회지 Vol.1 No.1
입자, 알데히드류, 케톤 같은 유해한 휘발성 유기화합물들이 생성된다는 보고가 있었다. 이번 연구에서는 천연 페인트에서 방출되는 털핀과 오존의 반응에 의한 미세 입자와 이차 유기화합물 생성에 대해서 조사하였다. 시편에 페인트를 칠하여 실내에서 건조시킨 후 테플론 챔버 내에서 오존과 반응시켰다. α, β-파이닌은 GC-MS와 FTIR을 사용하여 정성하였다. 입자생성에 대한 오존의 영향을 조사하기 위해 여러가지 실험이 수행되었다. 오존 농도가 100ppb에서 1000ppb로 증가할 때 입자 수농도는 8,000에서 70,000 particles/㎤까지 증가하였다. 포름알데하이드, 아세트알데하이드, 아세톤+아크로레인, 프로피온알데하이드 등의 반응 생성물은 HPLC로 분석하였다. 이런 화합물들은 잠재적으로 유해한 화합물이고, 인체에 해로운 영향을 끼친다. 이번 연구결과는 친환경제품의 실내공기질에 대한 해로운 영향에 대한 보기를 보여주었다. The use of natural paint for the application to walls and furnishings is now increasing to improve indoor air quality, thereby the natural paint could be a significant source of biogenic volatile organic compounds (BVOCs) in indoor environments. Recent studies have shown that gas-phase reactions between terpenes and ozone can generate sub-micron size particles and toxic volatile organic compounds such as aldehydes and ketones. In this research, we have studied the formation of particles and secondary organic compounds during the reaction of ozone with terpenes emitted from commercial natural paint. The paint applied onto stainless steel was dried and oxidized in a teflon chamber. Two monoterpenes (α- and β-pinenes) were identified by FTIR and GC/MS. Several tests were performed to evaluate the effects of ozone concentration on particle formation. Increased ozone levels significantly affect the increase of particle number concentration (monitored with SMPS), which results in the increase of particle counts ranging from 8,000 to 70,000 particles/㎤. Gas-phase products such as formaldehyde, acetaldehyde, acetone + acrolein, and propionaldehyde were identified during the terpene/ozone reactions by HPLC. These compounds are potential hazardous chemical compounds having harmful health effects to animals and plants. The results obtained from this study provide an insight on the adverse effect of eco-friendly natural product on indoor air quality (IAQ).