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유기염소계 잔류농약이 제주도 연안 해양환경에 미치는 영향
오윤근,김정호 ( Youn Keun Oh,Jung Ho Kim ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.3
To obtain the effects of residual organochlorine pesticides in the coastal environment on the Cheju Island, the ocean environment of Cheju city and Wimi was surveyed in May, August and October 1996. The qualification defection concentration of captan, chlorothalonil and dicofol of organochlorine pesticides in the water were 0.009ng/㎖, 0.005ng/㎖ and 0.023ng/㎖ by GC-ECD, respectively. The qualification defection concentration of captan, chlorothalonil and dicofol of organochlorine pesticides in the plant and animal were 0.018ng/g, 0.010ng/g and 0.046ng/g by GC-ECD, respectively. Captan, chlorothalonil and dicofol of organochlorine pesticides used in the farm were not detected in any water, sediment, seaweed cava(Ecklonia Cava), Agar(Gelidium amansii), turban sell(Batillus cornutus) and sea urchin(Anthocidaris Crassispina). The coastal environment in the cheju island was not effected the captan, chlorothalonil and dicofol of organochlorine pesticides used in the farm on cheju island
제주도 동부해안에서의 지하해수에 대한 화학적 특성에 관한 연구
오윤근,박관석 제주대학교 환경연구소 1994 환경연구논문집 : 제주대 Vol.2 No.1
Hydrographic conditions (temperature, salinity, precipitation) and geochemical characteristics of ground-seawater have been studied in the easterncoast areas (Kimnyoung) of Cheju Island during July to September 1994. The results are summarized as follows. 1) The water temperature of the ground-seawater was approximately 17 ±1℃ and remained constant. 2) standard-seawater contained 38.69% of Na^(+), and 8.82% of M^(++), while ground-seawater contained 39.33%, of Na^(+) and 7.78% of M^(++). 3) The chemical characteristics of ground-seawater seemed to be determined by the component rates of Na^(+) and Mg^(++), therefore these two elements are considered to be important for determining the chemical composition. of ground-seawater.
오윤근 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-
The salinization of groundwater is widely known as one type of water contamination in all over the coastal area. To investigate this salinization of groundwater, the various approaches are needed because its characteristics is widely changed from area to area and from time to time. depending on the aquifer conditions. The purpose of this study is to investigate the physical and chemical Characteristics of salinization of groundwater at the east area of Jeju island. For this purpose. the major ions of groundwater. are analyzed according to the well depth and tidal levels. The results obtained from this study are summarized as follows: At D-28 well. the deeper the well depth, the greater the degree of water quality fluctuation with tidal levels. However. this phenomenon is appeared inversely at D-124 well. This difference is due to the existence of the specific permeation structure such as cracks and joints at the same level with mean sea level at their location. It is found that time lag between tidal level and the fluctuation of water quality is 2-2.5 hours at D-28 well. and 3-3.5 hours a t D-124 well. As the depth of well is deeper. the concentrations of major ions are increased. excepting the case of NO_(3)^(-) originated from the land sources.
오윤근,김경훈,류성필 한국환경과학회 2000 한국환경과학회지 Vol.9 No.3
The purpose of this study is to investigate the physicochemical characteristics of salinization of groundwater at the estern area of Cheju island. For this purpose, the major ions of groundwater. spring water are analyzed. The concentration of Cl^- and Na^-+K^- contained in the groundwater at near the coastline are higher than those at inland area away from the coastline. The water quality components of groundwater observed at this area can be classified into 4 types such as Na-Cl, HCO_3, Na-Cl-HCO_3 and Ca-HCO_3. The concentration ratio of SO_4^- to Cl^- is 0.1354(R^2=0.972) at this area. This value is very similar with Dittomer's ratio of 0.13. For Na^-, K^-, and Mg^2+ versus Cl^-, their ratios also show a significant relationship between sea water and groundwater in this area. From the chloride-bicarbonate ratio, it can be estimated that the intrusion distance of seawater from coastline to inland area is 2.8km at Onpyung-Nansan, Sangdo and Pyungdae areas, and 5.4㎞ at Kosung-Susan area. The mixing ratio between seawater and fresh water by the intrusion of seawater is decreased with the distance toward inland from coastline. This ratio(fresh water : seawater) is 80:20 in spring water adjacent the coastlines, Onpyung area and 99.8:0.2 in the well at No.3 of Susan located at inland away from the coastline. The concentration of Na^- observed at field is 25∼45% lower than that theoretically calculated by this mixing ratio. Based on the data of EC, the equipotential line of 500μmhos/㎝ is located at 4∼5㎞ point at Kosung-Susan area and 2.5㎞ point at the other area. The equation of correlation between Cl^- concentration and EC values is Cl^-=0.1927EC-16.683 for the area lower than 500μmhos/㎝ and Cl^-=0.2773EC for the area beyond 500 μmhos/㎝.
오윤근 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-
The salinization of groundwater is widely known as one type of water contamination in all over the coastal area. To investigate this salinization of groundwater, the various approaches are needed because its characteristics is widely changed from area to area and from time to time, depending on the aquifer conditions. The purpose of this study is to investigate the physical and chemical characteristics of salinization of groundwater at the east area of Jeju island. For this purpose, the major ions of groundwater, are analyzed according to the well depth and tidal levels. The results obtained from this study are summarized as follows : At D -28 well, the deeper the well depth, the greater the degree of water quality fluctuation with tidal levels. However. this phenomenon is appeared inversely at D-124 well. This difference is due to the existence of the specific permeation structure such as cracks and joints at the same level with mean sea level at their location. It is found that time la9 between tidal level and the fluctuation of water quality is 2∼2.5 hours at D-28 well. and 3∼3.5 hours at D-124 well. As the depth of well is deeper. the concentrations of major ions are increased, excepting the case of NO3- originated from the land sources.