工團地域 小河川의 底泥中 重金屬 含量

權五億,梁成鎬,姜善泰 대구산업정보대학 1992 논문집 Vol.6 No.-

This study was carried out to investigate the contents of six heavy metals (Cd, Cr, Cu, Mn, Pb and Zn) in sediment collected at seven sites of 3-Gongdan stream receiving industrial wastewater. The mean Zn, Cu, Mn, Pb, Cr and Cd contents in sediment of all sites investigated was 1496.6mg/kg, 764.4mg/kg, 562.0 mg/kg, 231.6 mg/kg, 37.3 mg/kg and 9.5 mg/kg, respectively. It can be esteimated that the high amount of heavy metals is possibly due to the industrial wastewater, and alkaline pH water when most of the heavy metals are precipitated.

汚染된 河川 底泥에 含有된 燐의 存在形態

權五億 대구산업정보대학 1995 논문집 Vol.9 No.2

Fractional composition of sediment phosphorus in Kumho river are investigated. The regeneration of sedimented particulate phosphorus is known to be affected by the fractional composition of phosphorus ; adsorbed-P, nonapatite inorganic-P, apatite-P, and residual-P. The mean contents of total-P was higher in main stream(888.3 mg/kg) than in tributaries(753.7 mg/kg). The most abundant fraction of sediment phosphorus is NAI-P, and secondly residual fraction, thirdly apatitef raction. Adsorbed fraction is minor part of the total-P. Release of fraction of the sediment phosphorus are 48.4% of total-P in main stream, and 37.8% of total-P in tributaries, respectively. Release of sediment phosphorus in Kumho river is most likely to occur when the pH increase or oxygen depleted in bottom water.

밭토양에 살포된 질소비료의 거동 연구

권오억 대구산업정보대학 2000 논문집 Vol.14 No.2

Large quantities of nitrogen fertilizers are being used for crop production. The fate of nitrogen at and below the surface is governed by a variety of interrelated and complex processes. The various inorganic and organic forms exist simultaneously and undergo reversible and/or irreversible transformations depending on chemical and microbiological processes. Simultaneously, the physical processes of leaching, diffusion, and possibly ion exchange also are occurring. Therefore, Inorganic nitrogens resulting from fertilizers are possible contaminants of bank-filtered ground water, which is an alternative source of safe drinking water. Soil batch incubation were conducted to investigate the effects of pH, amount of nitrogen fertilizer, water content, oxygen supply and soil temperature on the biotransformation activities of inorganic nitrogens in the near field of bank filtration sites. Soil properties were found to be well equivalent to those of other cultivated field soils in Korea except surface soil pH 4.55±0.55 which is lower than average level. Overall, NH₄^(+)-N level in the field decreased, while N0₃^(-)N increased along with increasing depth of soil. With increased usage of nitrogen fertilizer, nitrification rate increased during incubation time. In batch incubation without sufficient oxygen supply and phosphorous, even if pH was amend with CaCO₃ solution, the nitrification was not quite active than incubation using of respirometer. Under the conditions of 25% of water content, nitrification potential was higher at pH 8 than at pH 5, and was higher at 18% of water content than at 35% under the conditions of pH 7. Nitrification potential under the conditions of varying temperature(10, 20 and 30℃) was highest at 30℃.

자생식물 추출물의 세포접착인자 저해활성 검색

권오억,이승웅,정미연,김영호,노문철,이현선,김영국 한국생약학회 2002 생약학회지 Vol.33 No.4

금호강하류의 저니중 중금속 함량분포

권오억 한국환경보건학회 1994 한국환경보건학회지 Vol.20 No.4

This study was performed to investigate the contents of six heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) with respect to the particle sizes and depths in sediment collected at nine sites of the lower Kumho river. The mean Cd, Cr, Cu, Ni, Pb and Zn contents in sediment of all sites ranged from 1.59~5.32 mg/kg, 17.4~301.7 mg/kg, 23.2~399.9 mg/kg, 9.48~116.8 mg/kg, 31.1~294.1 mg/kg and 74.2~964.3 mg/kg, respectively. The highest heavy metal contents was generally found to be Zn and lowest was Cd. The mean contents of heavy metal by particle sizes (1.0~0.5, 0.5~ 0.25, <0.25 mm)was the highest in particle sizes less than 0.25 mm, but the coefficients of variation was lowest in particle sizes less than 0.25 mm. Mean contents and coefficient of variation by depths (0~5 cm, 5~10 cm, 10~15 cm) were generally found to be higher in the upper parts of sediment than in the lower parts of sediment. Organic substances were found to be higher as the particle sizes become more small. Moreover, contents of heavy metal increased with the amounts of organic substances in sediment.

汚染된 河川底泥로부터 營養鹽 溶出에 關한 硏究

權五億,徐承敎,姜善泰 대구산업정보대학 1992 논문집 Vol.6 No.-

Past dicharges of settleable and colloidal organic solids into natural waterways have resulted in appreciable accumulations of sediment in the botton of many lakes, estuaries and river stretches over the years. Under such conditions, bottom sediments, when present, may be come one of the most important factots influencing the quality of natural water. Thus, this study was performed to investigate the nutrients release through chamber experimentation at Gangchang bridge which one of polluted places in Kumho River. The coefficients of sediment oxygen demand for aerobic and anaerobic conditions were 0.864, 5.04 day^(-1), respectively. Also, the release rate of NH₃-N and PO₄-P for aerobic conditions were 0.242g/m²·day, 0.029g/m²·day, and the released rate of NH₃-N and PO₄-P for anaerobic condition were 0.665g/m²·day, 0.186g/m²·day, respectively.

오염된 하천 저니에 함유된 중금속 존재형태

권오억 한국환경보건학회 1996 한국환경보건학회지 Vol.22 No.2

The species of four heavy metals (Cr, Cu, Ni and Pb) associated with sediments (viz exchangeable, carbonates, reducible, organic and residual fractions) were determined with respect to the particle sizes and depths at four locations of the lower Kumho river. In the exchangeable fraction, 3.7~19.52% of Ni and 2.8~14.81% of Pb were found, and in the carbonates fraction 2.12~19.43% of Ni and 1.39~15.42% of Pb were found. The reducible fraction retained about 8.66~44.93% of Cr, 0.41~9.79% of Cu, 17.38~35.74% of Ni and 9.5~44.89% of Pb. In the organic fraction about 0~21.06% of Cr, 2.95~35.74% of Cu, 0~14.66% of Ni and 0~10.65% of Pb were found. The residual fraction retained about 52.6~83.53% of Cr, 63.86~86.39% of Cu, 39.66~66.16% of Ni and 39.97~71.75% of Pb. The order of release or mobility of heavy metals was Ni > Pb > Cr > Cu. Mobile fraction of heavy metals by particle sizes (1.0~0.5 mm and 0.5~0.25 mm) was found to be higher in particle sizes 1.0~0.5 mm than that of 0.5~0.25 mm. The release or mobility of heavy metals by depths (0~5 cm, 5~10 cm and 10~15 cm) was found to be higher in the upper sediments than in the lower sediments, except Cu.

하천 퇴적물에 의한 영양염 용출특성

權五億 대구산업정보대학 1997 논문집 Vol.11 No.2

This study was performed to investigate variation of released nutrients according to DO, water temperature and depth in river sediment. The amount of released NH₃-N, PO₄-P in anaerobic condition was higher than that of aerobic condition. This implies that DO inhibited because of oxidation of released inorgnic substance from sediment. And the released NH₃-N, PO₄-P concentration depended on water temperature in direct proportion. The amounts of released NH₃-N, PO₄-P by depth(0-2cm, 2-7cm and 7-12cm) was found to be higher in upper sediment than in lower sediment under anaerobic condition, but almost not released under aerobic condition.

廢水로 汚染된 小河川의 底泥中 重金屬 存在形態

權五億 대구산업정보대학 1993 논문집 Vol.7 No.-

This study was conducted to predict the heavy metals behavior in sediments of 3-Gongdan stream polluted with wastewater. The most predominant fraction of heavy metals in sediments was residual fraction for Cd, Cr, Cu and Pd, reducible fraction for Mn, and carbonate fraction for Zn. Labile fraction of heavy metals were 65.1% of total Cd, 55.5% of total Cr, 60.8% of total Cu, 77.5% of total Mn, 58.8% of total Pb, and 77.4% of total Zn respectively. Most of labile fraction consisted of carbonate fraction for Cd, Cr, Pb and Zn, organic fraction for Cu, and reducible fraction for Mn.

강둑여과지 주변 밭토양의 질소용탈 특성

권오억,김종근 한국위생과학회 2001 한국위생과학회지 Vol.7 No.2

강둑여과지 주변 밭 토양을 채운 칼럼상에서 일정량(220mgN, 1100mgN)의 요소와 유안을 분말상태로 표면시용하고, 4일 간격으로, 1회에 250mL와 500mL의 증류수를 각각 칼럼에 유입시켜 질소용탈 변화를 조사한 결과, 다음과 같은 결론을 얻었다. 1. NO_3^--N의 용탈량은 동일한 시비량에 대해서는 물 유입량이 적은 토양에서 많았고, 동일한 물 유입량에 대해서는 시비량이 많은 토양에서 높게 나타나 토양 함수율이 낮고 질소량이 많을수록 질산화 작용이 활발하여 NO_3^--N가 많이 용탈된다는 것을 알 수 있었으며, 또한 유안을 첨가한 토양은 요소를 첨가한 토양보다 NO_3^--N가 다소 적게 용탈됨으로써 유안에서 생성된 SO_4^2- 이온이 질산화 작용에 미치는 영향이 크다는 것을 알 수 있었다. 2. 20일 및 52일간의 용탈실험후의 토양깊이별 잔류된 NH_4^+-n와 NO_3^--N 농도는 물 이동에 의해 토양깊이에 따라 모두 증가하였으며, 52일간의 용탈실험후 토양에 잔류된 NH_4^+-N와 NO_3^--N 농도는 20일간의 용탈실험에 비해 매우 낮게 나타나 용탈기간이 길수록 대부분의 무기성 질소는 용탈되고 토양에 잔류되는 양은 적다는 것을 알 수 있었다. 그리고, 칼럼에 첨가한 질소성분중 유츌율은 26~56%, 잔류율은 2~26%, 불회수 질소율은 27~60%, 질산화율은 57~94% 범위이었다. Leaching of applied N fertilizers can cause NO_3^--N contamination of groundwater. A leaching column study was conducted to evaluate N transformation and leaching from applied N fertilizers in the near field of bank filtration sites. Two sources of N, urea and ammonium sulfate were used and each leaching was followed by 4 days if incubation at 25~27℃. During each leaching event, 250 and 500mL of distilled water were applied once. A greater part of NH_4^+ was nitrified in the percolation through the soil column and little NH_4^+ was found in the leachate when 250ml of water was applied once. However, NH_4^+ was not perfectly nitrified and passed through soil columns with increased amounts if water and nitrogen. In 20 and 52 days of leaching experiments, the concentration of both NH_4^+-N and N)_3^--N increased slightly with soil depth, but in the 52 days of leaching there was very little difference with soil depth, and the concentration of nitrogen remaining in the soil. Percentage of leached nitrogen, soil residual nitrogen and losses of nitrogen through denitrification out of total nitrogen applied ranged 26~56, 3~26 and 27~60%, respectively.