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토양계내의 Cd(Ⅱ) 흡착 및 용출 특성 규명을 통한 토양환경 관리
이성홍 김천대학교 1999 김천대학교 논문집 Vol.20 No.-
Soil properties which affect the retention of Cd(Ⅱ) were investigated in the laboratory. It was determined, through selective removal, that organic matter and Fe-oxides are of lesser importance in influencing Cd retention than are soil clay minerals. The following trend : clays > organic matter > Fe-oxides represents the relative importance of each constituent in the adsorption of Cd by soil. The consistently greater Cd uptake by surface over subsurface samples was apparently due to differences in organic matter content, in as much as organic matter removal from both resulted in similar adsorption characteristics. All five soils studied exhibited a pH-dependent trend of adsorption. The extent of Cd adsorption was least at low pH values(4~5), was maximum in the neutral pH range, and leveled off or diminished under more alkaline conditions. There was no strong corrlation between Cd uptake and soil cation exchange capacity as routinely measured by the NH4OAc method. A knowledge of clay mineralogy in conjunction with soil pH is suggested as being the most reliable guide to predicting Cd retention by soils.
이성홍 김천대학교 1992 김천대학교 논문집 Vol.13 No.-
The experimental conditions for the removal of Zinc from aqueous solutions by crab shell have been studied, Crab shell was consisted of calcium carbonate (CaCO3), protein, moisture and chitin. Chitin was reported that it combines with metals through adsorption, and chelation as natural polymer. Zinc may be treated from aqueous solutions by contacting the solution with crab shell. Crab shell powder showed high zinc ion adsorptivity and there was a significant increase in adsorption capacity with pH variation. Zinc removal was pH dependent and increased up from pH 6-7. lonic strength in solution did not greatly affect the Zinc removal capacity of crab shell.
이성홍 김천대학교 1990 김천대학교 논문집 Vol.11 No.-
Trihalomethanes in drinking water occur principally as produ-cts of Chlorination process. The four most frequently occuring trihalomethanes are chloro-form, bromodichlorome thane, dibromochloromethane and bromo-form. Chloroform and other THMS have been shown to cause canser in laboratory animals. Trihalome thanes in tap water of Taegu, Kimcheon and Kumi Citi-es were analysed by gas chromatograph. The contents of THMS were 0.030 mg/l (Taegu), 0.013 mg/l(Kim-cheon) and 0.025 mg/l (Kumi). To eliminate THMs in drinking water, (1) use of an oxidant disinfectant that does not generate THMS in water. (2) treatment to reduce precursor concentrations prior to chlori-nation. (3) treatment to remove THMs after formation.
이성홍 김천대학교 1989 김천대학교 논문집 Vol.10 No.-
Several methods of water quality classification have been developed using biological indices. Saprobic system ,was developed first by Kolkwitz and Marsson(1908) and is widely used. This system is based on the tolerance of aquatic organisms to four levels of pollution. Other systems are based on the diversity and tolerance of aquatic species as affected by pollution. Biological indices offer some advantages when compared to chemical indicators. These methods are more comprehensive and reflect the overall water quality, conditions over a period of time preceding the survey, but preclude an accurate quantification of water quality using only biological indicators.