본 논문에서는 유역과 강우특성을 통합하여 오염물질 부하량을 계산할 수 있는 접근방법을 제시하였다. 이 기법의 기본적인 개념은 특정유역에서 강우시 발생하는 오염물질의 유량 가중평균 농도, 즉 EMC 변화는 오로지 강우패턴에 의해 결정된다는 가정에 기초하고 있다. 이러한 가정은 적어도 유역의 토지이용에 급격한 변화가 없고(적어도 강우가 집중되는 경작기간동안) 점 오염원이 적은 농촌유역에서는 타당하다. 따라서, 다양한 농촌유역과 강우 패턴 조건에서 조사된 많

하천에 오염물질이 순간적으로 유입된 경우에는 연속적인 유입의 경우와 다르게 분산계수의 변화에 따라 오염물질의 거동 특성이 민감하게 변한다. 하천에 순간적으로 유입된 오염물질의 거동특성을 분석하기 위하여 한강하류부에서 수리인자 및 수질인자를 실측하였다. 분산계수 추정에 사용되는 경험식에 실측된 수리인자를 적용하여 갈수시 한강하류부의 분산계수의 규모를 분석하고, 적용 가능성이 큰 경험식을 제시하였다 또한, 실측된 수질인자를 RMA-4 모형의 계산치와 비교하

The purpose of this study was to develop the preliminary source fingerprints of volatile organic compounds (VOC). The source categories studied were vehicles, gasoline vapor, gasoline storage tank, coating, dry cleaning and road covering. The source samples were collected using 6L electro-polished stainless steel canisters for about 20 seconds. From this study, the main component emitted from VOC sources in Korea was toluene. The toluene proportion for road covering, vehicles, coating and gasoline vapor were 35, 18, 16 and 5%, respectively. The C2-C5 alkane and alkene compounds were mainly emitted from vehicles, gasoline vapor and gasoline storage tank. The main compounds of coating were m/p-xylene(34%), toluene(16%), 1,2,4-TMB(10%) and o-xylene(9%), which are aromatic hydrocarbons. In the case of dry cleaning, nonane(41%), 1,2,4-TMB (22%) and 1,3,5-TMB(13%) were mainly emitted.

In this study, the material cycle model was applied to suggest alternative management of water quality for Jeju Harbor. The distribution of COD, DIN (dissolved inorganic nitrogen) and DIP (dissolved inorganic phosphorus) concentrations was reasonably reproduced by simulations on the model area of the Jeju Harbor using a material cycle model. The simulations of COD, DIN and DIP concentrations were performed under the conditions of 20～100% pollution loadings reductions from pollution sources. In case of the 100% reduction of the input loads from Sanzi river, concentrations of COD, DIN and DIP were reduced to 39%, 78% and 52%, respectively at Jeju harbor. In contrast, in case of the pollutant loadings reductions from sediment, the effect of DIN and DIP reduction relatively seemed to increase around the center of study area. The 95% reduction of the pollutant loadings from river and sediment is required to meet the COD and nutrients concentration of second grade of ocean water quality criteria.

The purpose of this study is to investigate the characteristics of water quality in Jeju harbor and to estimate pollutant loadings discharged into Jeju Harbor. To know characteristics of water quality in Jeju harbor and pollutant loadings of Sanzi river, we have investigated from August, 2000 to May, 2001. The results showed that the concentrations of COD, DIN and DIP were in the range of 1.00～4.85㎎/L (mean 2.15㎎/L), 2.14～74.0㎍-at/L(mean 12.20㎍-at/L) and 0.52～4.00㎍-at/L(mean 1.18㎍-at/L), respectively. These values were under Ⅲ class of seawater quality criteria. The ratio of nitrogen to phosphorus was lower than 16 except for Station 1 in Jeju harbor. Therefore, nitrogen was playing an important role in phytoplankton growth as limiting factor in Jeju harbor. The mean values of eutrophication index were exceeding 1, which was the eutrophication criteria. The results of estimating pollutant loadings at Sanzi river are 0.30 ton/day for COD, 300㎏/day for DIN and 18.0㎏/day for DIP, respectively.

딸기를 항균소재에 침지 처리한 후 1% 농도로 항균성 소재를 첨가시킨 저밀도폴리에틸렌(LDPE) 필름에 의하여 딸기를 싸서 포장하고 5에 저장하면서 미생물 성장, 부패율, 텍스쳐, 화학적 품질을 측정한 결과 대조구에 비교해서 긍정적인 결과를 얻을 수 있었다. 즉, 항균성 소재를 포함시킨 LDPE 필름은 무첨가 대조 필름에 비해 호기성 총균수, 효모/곰팡이수로 측정된 미생물의 증식을 억제하는 것으로 나타났다. 이러한 미생물 증식억제의 효과로 인하여

천연물로부터 항산화 활성물질을 목적으로 DPPH 자유 라디칼 소거활성 검색법을 이용하여 검색을 실사하고, 유의한 활성을 나타낸 산국 메탄올 추출물로부터 2종의 화합물을 분리하고 기기분석을 이용하여 화합물 1과 2의 구조를 apigenin과 acacetin-7-O-rutinoside (Linarin)으로 동정하였다. 이들 화합물은 각각 13.3 및 42.1μg의 농도에서 DPPH 라디칼을 50% 소거하는 활성을 나타내었으며, 화합물 1은 양성 대조양물인 L-ascorbic acid (RC50 = 13.1μg)에 비하여 강한 활성을 나타내었다.

Urban air quality is usually worse than that of rural counterpart. The contrasting atmospheric properties seem to be direct result of different urban-rural air pollutant emission. Hence, the emission estimation of air pollutants plays an important role to the atmospheric environmental management. The main purpose of this study is to find out the temporal and spatial distribution of air pollutant emission in Daegu area. For the study, the Daegu statistical yearbook and data of waste facilities and the report on traffic survey issued by Daegu metropolitan city and the statistical yearbook on the road capacity issued by the ministry of construction and transportation are used. Each item for the emission estimation is SO2, CO, HC, NOx, PM-10 from point, line and area source. The result were as follow; (1) The air pollutants with the highest amount of emission from the emission source is CO fllowed by NOx, SO2, PM-10, HC in descending order of magnitude. (2) The annually totaled air pollutant emission consists of 81%(73,185 ton/year) of line, 11%(9,589% ton/year) of area and 8%(7,445 ton/year) of point source in Daegu. Air polluant emission was mainly due to line sources. (3) High-emission of the air pollutants of line source appeared ariond Bukgu, Dalseonggun, Dongu and Seogu ; the areas with highway networks.

This study analyzes the surface ozone, NO and NO2 concentration data from 1997 to 1999 in Daegu. It investigates effect on precursor during high-ozone episode days. The high-ozone episode is defined when a daily maximum ozone concentration is higher than 100 ppb(ambient air quality standard of Korea) in at least one station among six air quality monitoring stations. The frequency of episodes is 13 days(33 hours). The frequency is the highest in May and September, and the area with the highest frequency is Nowondong and Manchondong. The average value of daily maximum ozone concentration with high ozone episode is 81.6 ppb, and that of 8-hour average ozone concentration is 58.6 ppb. It means that ozone pollution is continuous and wide-ranging in Daegu. The daily variation of NO, NO2 and O3 in high-ozone episodes are inversely proportional one another. Nowondong an industrial area, is affected by pollutants that are emitted from the primary sources, while Manchondong a residential area, is affected by the advection of O3 or by the primary pollutants like VOCs.