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주물공정에서 발생하는 VOCs 및 악취 유발물질에 관한 연구
안문호 ( Wen-hao An ),박성호 ( Sung-ho Park ),신철호 ( Chul-ho Shin ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.3
본 연구는 주물공정에서 배출되는 먼지, 악취물질 및 VOC를 분석하였다. 먼지는 TSP와 PM-10을 중량법으로 측정하였으며, VOC, 알데히드 유도체 및 암모니아는 저온흡착-고온열탈착 GC/MS, HPLC 및 분광광도계를 이용하여 분석하였다. 주형해체와 주물사처리 공정에서의 TSP는 5,000~10,000ug/㎥을 나타내 PM-10보다 2~3배 정도 높게 나타났다. GC/MS와 HPLC 크로마토그램을 분석한 결과 검출된 유기화합물은 BTEX, 페놀, MIBK, 벤젠유도체, 퓨란유도체, 지방족탄화수소, 포름알데히드, 아세트알데히드, N,N-dimethyl ethyl amine 및 암모니아 등이며, 이들 중 일부 화합물은 인체의 최소감지농도를 초과하는 것으로 나타났다. 이들 유기 화합물은 주물공정에서 원료로 사용하는 화합물이 분해되어 생성되는 반응부산물이거나 분해되지 않은 물질로서 휘발성유기화합물을 포함한 알데히드 및 아민으로 다양하다. This study was analysed a volatile organic compounds, odor compounds and dust from samples emitted a casting process. Volatile organic compounds were analysed using gas chromatography/mass spectrometer (GC/MS) with cryo-focusing/thermal desorption(CF/TD) system. The total suspended particles from casting dismantlement and casting sand treatment process are about 2 and 3 times higher than PM-10 of same positions. From the GC/MS and HPLC chromatograms, BTEX(benzene, toluene, ethylbenzene, and xylene), phenol, MIBK, benzene derivative, furan derivative, aliphatic hydro carbon, formaldehyde, acetaldehyde, N,N-dimethyl ethyl amine and ammonia were detected. These organic compounds indicates that by-products in the casting process vary in compounds from volatile organic compounds to aldehydes and amines.
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안문호 ( Wen-hao An ),박성호 ( Sung-ho Park ),신철호 ( Chul-ho Shin ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.4
본 연구에서는 금속의 절삭공정에서 방출되는 배출가스 중 휘발성유기화합물과 악취물질의 성분과 농도를 분석하였다. 휘발성유기화합물은 CF-TD 방식을 결합한 GC/MS로 분석하였다. 본 연구 결과에 의하면 아래와 같다. 1. 수용성 절삭공정에서 배출되는 휘발성유기화합물은 데칸, 운데칸과 지방족 유기화합물이 주된 화합물이다. 2. GC/MS 크로마토그램으로부터, C10~C18 사이의 지방족유기화합물이 RT 19~35분 사이에 나타났다. 3. 방청액에서의 데칸과 운데칸의 농도는 각각 5.62와 1.58ppm으로 조사됐다. 4. 금속의 절삭공정에서 검출된 알데히드와 황화합물의 유도체는 포름알데히드, 아세트알데히드, 프로피온알데히드 및 황화수소 등이다. This study was carried out to investigate the VOC(Volatile Organic Compound) and odor compounds which caused from metal cutting process. Volatile organic compounds were analysed using gas chromatography/mass spectrometer (GC/MS) with cryo-focusing/thermal desorption(CF/TD) system. Based on the results of this study, the followings are conclusions. 1. Volatile organic compounds from water soluble metal cutting solutions are decane, undecane and saturated aliphatic organic carbons. 2. From the GC/MS chromatograms, aliphatic organic carbons of the C10~C18 are detected at retension time 19~35 minute. 3. The concentrations of decane and undecane from corrosion inhibition solution were estimated as 5.62 and 1.58ppm, respectively. 4. The detected aldehydes and sulfur derivatives in metal working process were formaldehyde, acetaldehyde, propionaldehyde, and hydrogen sulfide.
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안설화(Xue?Hua An),안문호(Wen?Hao An),임일빈(Il?Bin Im),이상복(Sang Bok Lee),강종국(Jong?Gook Kang) 한국농약과학회 2006 농약과학회지 Vol.10 No.4
The adsorption and persistence of pencycuron {1-(4-chlorobenzyl) cyclopentyl-3-phenylurea} in soils were investigated under laboratory and field conditions to in order to assess the safety use and environmental impact. In the adsorption rate experiments, a significant power function of relation was found between the adsorbed amount of pencycuron and the shaking time. Within one hour following the shaking, the adsorption amounts in the SCL and the SiCL were 60 and 65% of the maximum adsorption amounts, respectively. The adsorption reached a quasi-equilibrium 12 hours after shaking. The adsorption isotherms followed the Freundlich equation. The coefficient (1/n) indicating adsorption strength and degree of nonlinearity was 1.45 for SCL and 1.68 to SiCL. The adsorption coefficients (K<SUB>d</SUB>) were 2.31 for SCL and 2.92 to SiCL, and the organic carbon partition coefficient, Koc, was 292.9 in SCL and 200.5 inSiCL. In the laboratory study, the degradation rate of pencycuron in soils followed a first-order kinetic model. The degradation rate was greatly affected by soil temperature. As soil incubation temperature was increased from 12 to 28℃, the residual half?life was decreased from 95 to 20 days. Arrhenius activation energy was 57.8 kJ mol<SUP>-1</SUP>. Furthermore, the soil moisture content affected the degradation rate. The half?life in soil with 30 to 70% of field moisture capacity was ranged from 21 to 38 days. The moisture dependence coefficient, B value in the empirical equation was 0.65. In field experiments, the half-life were 26 and 23 days, respectively. The duration for period of 90% degradation was 57 days. The difference between SCL and SiCL soils varied to pencycuron degradation rates were very limited, particularly under the field conditions, even though the characteristics of both soils are varied.
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정팔진 ( Paul Gene Chung ),김민정 ( Min Jeong Kim ),박정훈 ( Jeong Hun Park ),안문호 ( Wen Hao An ) 전북대학교 공학연구원 (구 전북대학교 공업기술연구소) 2005 工學硏究 Vol.36 No.-
In this study, water quality characteristics in rainwater samples was analyzed to examine the microbial risk of rainwater for utilization. Unlike the quality of ground water and surface water, only a few total colonies have found in the precipitation samples. Many colony which inhabits in rainwater(rain-off) was found. It was examine water quality of rainwater. The study covers six months monitoring period. pH varied from 3.2 to 7.6 and color ranged from 20 to 60 CU. Turbidity was below 50NTU. The coliforms number ranged from 1000 to 41,111 number/ml. In the present study, a feasibility of an advanced oxidation using Plasma, Ozone, UV process for rainwater reclamation was investigated. Plasma, Ozone, UV process were introduced as a disinfection method to increase the killing effect for microorganisms. Contact time was changed from 3min to 20min to determine the optimum operation condition for the system. Increasing contact time, The coliforms number and the total colonies number was rapidly decreased. It is interesting to note that a 100% reduction in total coliforms and total colonies were achieved. Total coliforms and total colonies were successfully inactivated to the level of satisfying. Besides disinfection of the coliforms, approximately a 50% removal in DOC was pronounced at a contact time of 10min. More than 90% removal in turbidity, ss and color was also observed at a contact time of 10min with plasma. The application of plasma appeared to be one of options to reuse rainwater.
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경엽 및 관주처리에 따른 배추 중 Trifloxystrobin의 안전성 평가
안설화(Xue?Hua An),이상복(Sang Bok Lee),안문호(Wen?Hao An),김재덕(Jai Duk Kim) 한국농약과학회 2007 농약과학회지 Vol.11 No.1
Trifloxystrobin standard was analyzed by high performance liquid chromatography (HPLC). The recovery of the trifloxystrobin and it’s metabolite CGA321113 were 84.6~95.3% and 86.4~87.3% and their detection limits for both of them were 0.04 ㎎ ㎏?¹. In case of foliar application in the chinese cabbage (Brassica campestris L. ssp pekinnensis (Lour.) Rupr.), the amount of the residue of trifloxystrobin was above the maximum residue level (temporary MRL, 0.5 ㎎ ㎏?¹) when it was treated either two times three to five days before harvest or three times three to seven days before harvest. Whereas in case of drenching the mount of the residue was below the temporary MRL, the residues in the cabbage in both the cases where the recommended amount (150 mL of the solution diluted 1500 times) and double of the amount were treated were 0.16 and 0.31 ㎎ ㎏?¹, respectively. In conclusion, it should be safe to apply the trifloxystrobin (22% WP) in the soil of cabbage field abiding by the tentative recommendation level, but for the foliar application it appeared inappropriate.
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