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 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.

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.

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.

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.

Bismuthiol I이 내포된 p-Dicholorobenzene 미세결정으로 예비농축한 후 Copper(II) 정량

최희선 水原大學校 2015 論文集 Vol.29 No.-

A column preconcentration method with p-dichlorobenzene loaded with bismuthiol I (BI) was developed for the determination of trace Cu(II) in various aqueous samples by flame atomic absorption spectrophotometry. Several experimental conditions such as the pH of the sample solution, the amount of chelating agent bismuthiol I, the amount of adsorbent p-dichlorobenzene-BI, and the flow rate of sample solution were optimized. When the interfering effects of various concomitant ions were investigated, Bi(III) and Sn(II) interfered with. The dynamic range, the correlation coefficient (R2) and the detection limit of Cu(II) obtained by this proposed technique were 3.0~120 ng mL-1, 0.9913 and 1.6 ng mL-1, respectively. For validating this technique, the aqueous samples (wastewater, reservoir water and stream water) were used. Recovery yields of 95~98% were obtained. Based on the experimental results, it was found that this proposed technique could be applied to the determination of Cu(II) in various aqueous samples.

농부가 아닌 환자에서 발생한 긴털가루진드기(Tyrophagus Putrescentiae)에 의한 기관지천식 1례

최대로,김형수,고창옥,김희선,윤호성,박용범,김상훈,이재영 대한천식 및 알레르기학회 2004 천식 및 알레르기 Vol.24 No.1

Storage mites are believed one of the most important allergens in farmers and rural regions. Tyrophagus putrescenitiae, belonging to storage mites, is found not only within storehouses but also in the house dust, and the third most common mites following Dematophagoides farinae and Dermatophagoides pteronyssnus in house dust in Korea. The sensitization rate to Trophagus putrescentiae was reported as high as that of house dust mite in patients visiting the allergy clinic in large cities in Korea. We experienced a 69-year-old man who had suffered from dyspnea, wheezing, and coughing for 10 years. He retired from the teaching profession, and had lived in a large city. Deajeon. The skin prick test showed a positive reaction to Tyrophagus putrescentiae and negative reactions to house dust mites. The bronchial challenge test with Tyrophagus putrescentiae showed late asthmatic reaction. We confirmed a Tyrophagus putrescentiae induced asthma in non occupational setting. (J Asthma Allergy Clin Immunol 24 : 141-5, 2004)

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.

관속의 Benzophenone에 삼성분 착물을 흡착-예비농축한 후 구리의 정량

최희선 수원대학교 기능성생명소재연구소 2004 자연과학연구논문집 Vol.3 No.2

A technique for the determination of trace amount of copper(Ⅱ) after the preconcentration by adsorbing on benzophenone in a column as Cu(Ⅱ)-nitroso-R salt-CTAB ternary complex was developed. Several experimental conditions such as the pH of sample solution, the amount of nitroso-R salt and cetyltrimethylammonium bromide(CTAB), the amount of benzophenone, and the flowrate of sample solution were optimized. The interfering effects of diverse ions were investigated. Co(Ⅱ) and Ni(Ⅱ) interfered with heavier than any other ions, but these effects could be overcome sufficiently by adjusting the concentration of nitroso-R salt to be 10^(-3)M. The detection limit of this technique was 0.8 ngmL^(-1). Recovery yields of Cu(Ⅱ) in real samples were mostly above 93%. Based on the experimental results, this proposed technique could be applied to the determination of trace amount of Cu(Ⅱ) in real aqueous samples.

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.