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.

비이온성 미셀내에서 킬레이트제와 그의 금속 착물의 용해도와 안정도

최희선 수원대학교 기초과학연구소 1995 基礎科學論文集 Vol.4 No.-

It was appeared that 1-nitroso-2-naphthol slightly dissolved in aqueous solution, but dissolved in 5% Tween 80 solution well as 770mg/100mL of its solubility. As the absorption spectra of 1-nitroso-2naphthol complexes of Cu(Ⅱ), Co(Ⅱ), Ni(Ⅱ), and Fe(Ⅲ) were able to obtain in 5% Tween 80 solution, it was proved that its metal complexes could also be dissolved in nonionic micelle. And 1-nitroso-2naphthol and its Cu(Ⅱ), Co(Ⅱ), Ni(Ⅱ), and Fe(Ⅲ) complexes in 5% Tween 80 solution were stable for at least 100 minutes. From the results of this experiment, it is expected that its Cu(Ⅱ), Co(Ⅱ), Ni(Ⅱ), and Fe(Ⅲ) complexes in nonionic surfactant Tween 80 solution can be determined by UV-Vis spectrophotometry.

Amberlite XAD-4 수지에 흡착되는 cupferron 착물을 이용한 구리(II)의 예비농축 및 정량

최희선 水原大學校 2017 論文集 Vol.31 No.-

A sensitive method for the determination of trace Cu(II) after the preconcentration by adsorbing its cupferron complex onto pulverized XAD-4 resin in glass column developed. Cu(II) was determined by a flame atomic absorption spectrophotometry. Several experimental conditions such as the pH of sample solution, concentration of cupferron, amount of XAD-4 resin and flowrate of sample solution were optimized to 5.0, 5.0 × 10-4 M, 0.20 g and 6.0 mL/minute respectively. The interfering effects of diverse concomitant ions were investigated. Fe(III) interfered seriously with, but the interference by Fe(III) was completely eliminated by adjusting the concentration of cupferron to 1.0 × 10-3 M. Under thees optimum conditions, the calibration curve of Cu(II) was obtained over concentration range of 1.0~60 ng mL-1. The detection limit of this method was 0.9 ng mL-1. For validating the technique, the aqueous samples (stream water, reservoir water, and wastewater) were used as real samples. The recovery yields obtained from the spiked Cu(II) standard solution were more than 95%. Based on the results from the experiment, this proposed technique could be applied to the determination of Cu(II) in real samples.

Salicylaldoxime이 흡착된 Silica Gel을 이용한 구리(II)의 예비농축 및 정량

최희선 水原大學校 2016 論文集 Vol.30 No.-

A technique on the preconcentration and determination of trace Cu(II) after adsorbing of Cu(II) on salicylaldoxime loaded silica gel was studied. The conditions on the separation of Cu(II) such as pH of solution, the amount of silica gel loaded salicylaldoxime, the flowrate for adsorption, and the desorption solvent were optimized to 9.0, 0.05 g, 25 mL min-1 and 1 M HNO3 in acetone, respectively. Under these optimum conditions, the calibration curve of Cu(II) was obtained over concentration range of 3~110 ng mL-1. The detection limit was 0.5 ng mL-1. Recovery yields of Cu(II) in various natural water samples were more than 90%

2-Mercaptobenzothiazole이 내포된 Benzophenone 미세결정을 이용한 Co(II)의 예비농축 및 정량

최희선 水原大學校 2013 論文集 Vol.27 No.-

A technique for the determination of trace Co(II) in various aqueous samples by FAAS after the column preconcentration onto microcrystalline benzophenone loaded with 2-mercaptobenzo -thiazole(2-MBT) has been developed. Several experimental conditions such as the pH of the sample solution, the amount of chelating agent 2-mercaptobenzothiazole, the amount of adsorbent benzophenone-2-MBT, and the flow rate of sample solution were optimized. The interfering effects of various concomitant ions were investigated. The linear range, the correlation coefficient(R2) and the detection limit obtained by this proposed technique were 2.0~120 ng mL-1, 0.9923, and 0.5 ng mL-1, respectively. For validating this technique, the aqueous samples(wastewater, reservoir water and stream water) were used. Recovery yields of 93~99 % were obtained. Based on the results from the experiment, it was found that this technique could be applied to the preconcentration and determination of Co(II) in various aqueous samples.

비이온성 미셀 용액에서 Ammonium Pyrrolidinedithiocarbamate 착물에 의한 Cd(Ⅱ)의 정량

崔熙善 水原大學校 1999 論文集 Vol.17 No.-

The determination of Cd(II) with ammonium pyrrolidinedithiocarbamate in Tween 80 micellar medium has been studied. The UV-Vis spectrum of Cd(PDC)2 complex in Tween 80 medium had more sensitivity than that in chloroform. Cd(PDC)2 complex was very stable at pH 7.0 and up to 100 minutes, and could be quantitatively chelated if APDC was added to the sample solution more 30 times than the moles of Cd(II). The optimum concentration of Tween 80 was 0.1%. And, the calibration curve of Cd(PDC)2 complex with good linearity(R2=0.9989) was obtained in 0.1% Tween 80 medium. The detection limit and the determination limit of this proposed technique were 0.2711㎍/mL and 0.6706㎍/mL, respectively.

Activated Carbon에 1-nitroso-2-naphthol 착물로 농축시킨 후 코발트(Ⅱ)의 정량

최희선 수원대학교 기능성생명소재연구소 2003 자연과학연구논문집 Vol.2 No.2

A method for the determination of cobalt after the preconcentration by adsorbing its 1 -nitroso-2-naphthol complex onto activated carbon was studied. Several experimental conditions such as the pH of the solution, the amount of 1-nitroso-2-naphthol and activated carbon, and the elution and desorption flowrate were optimized. Trace cobalt(Ⅱ) in 200mL water sample was chelated with 5.0mL of l000ppm 1-nitroso-2-naphthol at pH 9.0. After this solution was stirred for 30 minutes, its was passed through the activated carbon column at a flowrate of 1.0mL/min. The desorption of Co(Ⅱ)-1-nitroso-2-naphthol was carried out by treating the activated carbon with l0mL portion of 1M HNO_(3) in acetone. Cobalt was determined by flame atomic absorption spectrometry. The interfering effects of concomitant ions were investigated and eliminated. This method could be applied to natural water samples and the recovery of above 95% was obtained in the real samples.

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.

괴사성 치은구내염환아의 증례보고 : CASE REPORT

최남기,정희경,양규호,김선미 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.1

괴사성 치은염(Necrotizing ulcerative gingivitis, NUG), 괴사성 치주염(necrotizing ulcerative periodontitis, NUP),괴사성 구내염(necrotizing stomatits, NS), 그리고 수암(noma, cancrum oris)은 급속도로 파괴적이며 쇠약하게 하는 잠재성이 큰 구강감염으로 질환의 같은 진행과정에 대해 다른 임상단계로 간주되기도 하나 집합적으로 Vincent's infection, infectious oral necrosis 또는 괴사성 치은구내염(Necrotizing gingivostomati-tis, NG)라고 한다. 이러한 necrotizing gingivostomatitis(NG)의 발생률은 0.19~0.5%이며 2~6세에 가장 높은 발병율을 보인다. Necrotizing gingivostomati-tis는 치명적인 바이러스 감염과 면역체계가 약화된 경우 발생할 수 있으며 주 진단학적 증상으로 동통, 치간유두 부위의 궤양이나 괴사, 치은출혈이 있으며 이차적인 증상은 위막 등이 있다. 이에 본원 소아과에서 의뢰되어 necrotizing gingivostomatitis로 진단받은 환아의 구강내 소견 및 치료경과에 대해 보고하고자 한다. Necrotizing ulcerative gingivitis(NUG), necrotizing ulcerative periodontitis(NUP), necrotizing stomatitis(NS), and Noma(cnacrum oris) are rapidly destructive, debilitating, and potentially serious oral infection which considered to be different clinical stages of the same process. These have been collectively referred to as: Vincent's infection, infectious oral necrosis, or necrotizing gingivostomatitis(NG). Prevalence of necrotizing gingivostomatitis is 0.19~0.5% and peak incidence is 2-6 years of age. The etiology and pathogenesis of necrotizing gingivostomatitis have been associated with virulent bacteria and impaired host defense and the primary diagnostic signs are pain. interdental ulceration or necrosis. and gingival bleeding. Secondary diagnostic sign is pseudomembrane. This case report was about oral conditions and treatment of the patient who referred from the Dept. of PED and diagnosed a necorotizing gingivostomatitis.

Benzophenone에 Oxine착물로 흡착 농축시킨 후 니켈(Ⅱ)의 정량

최희선 수원대학교 기능성생명소재연구소 2003 자연과학연구논문집 Vol.2 No.1

A technique for the determination of nickel after the preconcentration by adsorbing its oxine complex onto benzophenone was developed. Several experimental conditions such as the pH of the solution, the amount of oxine and benzophenone and stirring time were optimized. Trace nickel in 100mL water sample was chelated with 1.5mL of 0.02M oxine at pH 6.0. After 0.15g benzophenone was added, the solution was stirred for 30minutes. The benzophenone containing Ni(Ⅱ)-oxine complex was filtered and dissolved in ethyl alcohol. Nickel was determined by flame atomic absorption spectrophotometry. The interfering effects of diverse metal ions were investigated and eliminated. This method could be applied to natural water samples and the recovery of about 95% was obtained in the real samples.