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원자흡수분광법에 의한 칼슘분석에서 양이온들의 방해작용에 따른 이트륨의 해방효과에 관한 연구
崔熙善 水原大學校 1987 論文集 Vol.5 No.-
In the atomic absorption spectrometry using an air-acetylene flame, theinterferences of ??,??,??, and ??, on the calcium absorption and the repression of this interference by the addition of yttrium have been studied. The interference by ?? and ?? is completely released by the addition of yttrium three times as much interfering cation, but the interference by ?? and ?? is not completely released.
Dibenzoylmethane 착물을 Benzophenone으로 흡착 분리한 후 Mn (Ⅱ)의 원자분광법 정량
崔熙善 水原大學校 2001 論文集 Vol.19 No.-
A method for the determination of Mn(Ⅱ) after separating by the adsorption of its dibenzoylmethane complex onto benzophenone was studied. When dibenzoylmethane as a complexing agent was added to the sample solution by 50 times of moles of Mn(Ⅱ). an effective separation was achieved. And, the other conditions such as pH of solution, amount of benzophenone, and stirring time were optimized to 6.0, 0.15g and 60min., respectively. Under the optimum conditions, the calibration curve of Mn(Ⅱ) was obtained over range 0.05∼1.0㎍/mL. The detection limit and the determination limit of Mn(Ⅱ) were 3.5ng/mL and 11.6ng/mL, respectively. Recovery yield of Mn(Ⅱ) in river water was more than 95%.
敎育委員會의 位相에 관한 硏究 : 地方議會와의 關係를 中心으로
崔熙善 仁川敎育大學校 1993 論文集 Vol.27 No.1
This study intended to search policy direction and tasks of governing local education in the age of local control. Specifically, this study gave focuses on the status of the local of education with the relation of local assemblies. Namelly, (1) re-examining principles and directions of current "Act of Local Education Autonomy", (2) reallocating power and responsibilities of performing local educational tasks. The methodology employed in this study were literature reviews, interviews with central and local educational administrators, surveys through local educational agencies, expert conferences, etc. Some major findings of thie study were as followes: (1) Public education should become one of the most inportant tasks which local government must give a high priority on the development of education in their region, (2) The board of education in Korea have more powers and responsibilities for the regional education development, (3) The current problems related to the organzation of the board of education is found in status, member, election, etc, of it. It is not desirable to the current status of the board of education. Therefore, findings of this study are applicable for the improvement of status of the board of education in Korea and those countries with similiar educational governance and historical backgrounds.
비이온성 미셀용액에서 Fe(Ⅲ), Co(Ⅱ), Ni(Ⅱ) 및 Cu(Ⅱ)의 분광광도법 정량
최희선 수원대학교 기초과학연구소 1996 基礎科學論文集 Vol.5 No.-
Various metal ions were determined by UV-visible spectrophotometry as their complexes with 1-nitroso-2-naphthol in the presence of micellar medium. In Tween 80 medium, it was found that the 1-nitroso-2-naphthol complexes of Fe(Ⅲ), Co(Ⅱ), Ni(Ⅱ), and Cu(Ⅱ) highly absorbed at pH 1.0, 5.0, 8.0 and 9.0, respectively, and that λ_max scarcely shifted around these pHs. The metal-1-nitroso-2-naphthol complexes could be quantitatively chelated if 1-nitroso-2-naphthol, chelating agent, was added to the sample solution more 20 times than the amount of metal ions. And, the calibration curves of metal-1-nitroso-2-naphthol with good linearity were obtained in 2.5% Tween 80 medium. Therefore, it is expected to determine various metal ions simply and conveniently in real samples.
Benzophenone 미세결정을 이용한 Cd^2+착물 추출 및 정량
최희선 수원대학교 기초과학연구소 1993 基礎科學論文集 Vol.2 No.-
It has been studied on the determination of Cd^(2+) with microcrystalline benzophenone by solid-liquid extraction. It is used 8-hydroxyquinoline as complexing agent. 8-hydroxyquinoline is added to this solution by 30 times of moles of Cde^(2+). The optimum pH is 8.0. And also 0.7g benzophenone is added. The optimum condition in standing time is about 1 hr. Under these conditions, a calibration curve for Cd^(2+) is obtained over range 0.02 - 0.18ppm. This resulting calibration curve in this range has a good linearity.