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.

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.

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.

미셀 용액에서 Ammonium Pyrrolidinedithiocarbamate를 이용한 Ni(Ⅱ)의 정량

최희선 수원대학교 자연과학연구소 1998 자연과학논문집 Vol.1 No.-

In has been studied on the determination of Ni(Ⅱ) with APDC(ammonium pyrrolidinedithiocarbamate) as a chelating agent in Tween80 micellar medium. UV-Vis spectrum of Ni(PDC)₂complex in Tween 80 medium had more appearance and sensitivity than that in chloroform solvent. Ni(PDC)₂complex 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 10 times than the amount of Ni(Ⅱ). The optimum concentration of Tween80 was 0.1%. And, the calibration curve of Ni(PDC)₂complex with good linearity(R²= 0.9955) was obtained in 0.1% Tween80 medium. Detection limit and determination limit of this proposed technique were 0.0855 ㎍/mL and 0.2849㎍/mL, respectively.

원자흡수분광법에 의한 칼슘분석에서 음이온들의 방해작용에 따른 이트륨의 해방효과에 관한 연구

崔熙善 水原大學校 1988 論文集 Vol.6 No.-

In an air-acetylene flame atomic absorption spectrometry, the interferences by ??,?? and ?? on the calcium absorption and the repression of these interferences by the addition of yttrium have been studied. The interference by ?? and ?? is completely released by the addition of yttrium three times as much as interfering anion but the releasing of the interference by ?? is not possible using the given amounts (??) of yttrium. The interference by ??, ?? and ?? is completely released when the concentration of these interfering anions in one-fifth amounts of yttrium.

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.

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.

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%

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.