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용매추출법에 의한 토양중의 미량 구리와 아연원소의 동시추출 및 정량에 관한 연구
정창웅,지석주,박종안 한국환경보건학회 1995 한국환경보건학회지 Vol.21 No.3
A rapid and selective co-extraction systems of copper and zinc-thiocyanate complex into various types of alkylamine for the simultaneous determination of two metal ions by atomic absorption spectrometry and ion chromatograph have been proposed. The quantitative extractions of Cu(II) and Zn(II) at 0.1 M-thiocyanate and 0.1 M-HCI were achieved with Aliquat 336-$CHCl_3$. The detection limits of Cu and Zn were 2 ppb and 0.9 ppb respectively.
이중추출과 분광광도법에 의한 미량 수은(Ⅱ)의 정량에 관한 연구
정창웅 순천향대학교 기초과학연구소 2004 순천향자연과학연구 논문집 Vol.10 No.2
A selective and highly sensitive spectrophotometric method has been developed for the determination of trace mercury(Ⅱ) with 0.3M-KSCN and 1% Aliquat 336-CHCI₃. Hg(Ⅱ)-thiocyanate complex was extracted into quaternary ammonium salt and stripped into 3M-HCIO₄ solution. Hg(Ⅱ)-Dithizone complex has maximum absorbance at 490㎚ and obeys Beer's law in the range of 0.2~0.8㎍/㎖ in aqueous solution. The molar absorptivity and Sandell's sensitivity are 1.6×10^(5) L/mole·㎝ and 1.25 ×10^(-3)㎍/㎠ respectively.
티오황산착염생성과 고분자량알킬아민에 의한 구리(11)의 추출(제1보)
정창웅 순천향대학교 1992 논문집 Vol.15 No.1
Micro smount of copper(11)from 0.01M sodium thiosulfate solution can be quantitatively extracted with 1% Aliquat336-MIBK. The mechanism of the extraction of copper(11)as thiosulfate complex into Aliquat 336 was elucidated. The effect of organic diluents and diverse ions on the determination of copper by atomic absortion spectrometry were examined.
액체-액체추출과 원자흡수분광법에 의한 토양중 미량 코발트(Ⅱ)의 정량에 관한 연구
정창웅 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
A rapid and selective extraction system for the subsequent determination of trace Co(Ⅱ) by atomic absorption spectrometry has been proposed. The quantitative extraction of Co in thiocyanate and nitric acid media was achieved with Aliquat 336-MIBK. The detection limit of Co was 1.1 ppb and analysis of Co in NBS sample was performed by the proposed method.
반도체레이저와 Flow Cell을 이용한 암모니아 측정
정창웅 순천향대학교 기초과학연구소 2001 순천향자연과학연구 논문집 Vol.7 No.1
A simple and inexpensive colorimetric spectrometer for determining ammonia has been developed, comprising a diode laser as the light source, optical fibers for the light guide and a photodiode as detector. The stability and performance of the new system was investigated by obtaining the calibration curve for the standard ammonia solution. The results showed that the developed spectrometer was useful for the determination of 19.6 μg ∼ 1.960 mg NH3-N/L levels.
역추출과 PAR법에 의한 수질중 미량 수은의 비색정량에 관한 연구
정창웅 한국환경보건학회 1995 한국환경보건학회지 Vol.21 No.3
A selective and highly sensitive spectrophotometric measurements have been developed for the determination of trace mercury(II) with thiosulfate and PAR. Hg(II)-thiosulfate complex was extracted into high molecular alkylamine such as quaternary ammonium salt and back extracted into 1 M-HCl solution. The Hg(II)-PAR complex has maximum absorbance at 499 nm and obeys Beer s law in the range of 0.04~1.0 $\mu g/mL$ of mercury(II). The molar absorptivity and Sandell s sensitivity are $6.27\times 10^4 L.mole^{-1} cm^{-1}$ and $3.2\times 10^{-3}g/cm^2$ respectively.
용매추출에 의한 생체시료중 미량 카드뮴의 분리, 농축 및 정량에 관한 연구
정창웅 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
Trace amount of cadmium was quantitatively extracted with 1% Aliquat 336-MIBK from 0.2M potassium thiocyanate and 0.01M-HCl solution. Of various liquid anion exchangers were tested, Aliquat 336 was found to be most efficient. The detection limit for the determination of Cd was 0.7ppb and proposed method was applied to the determination of Cd in serum and standard copper concentrates.