http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
초임계 유체 크로마토그래피에서 이동상에 Modifier를 첨가시키는 새로운 방법과 첨가된 Modifier(H2O) 양의 측정방법
주도원,표동진,Ju Doweon,Pyo Dongjin 대한화학회 1993 대한화학회지 Vol.37 No.6
초임계 유체 크로마토그래피(Supercritical Fluid Chromatography, SFC)는 종래의 크로마토그래피 방법으로 분석하기 어려운 물질을 분석해 내는 기술로써 발전이 되어왔다. 그러나, SFC에서 이동상으로 많이 사용되고 있는 초임계 C$O_2$는 용매로써 특성이 n-hexane과 매우 비슷하여 극성이 큰 시료들을 용출(elution)시키기가 어렵다. 이러한 점을 해결하기 위하여 초임계 C$O_2$에 극성을 지닌 물질 즉, 변형제(modifier)를 섞어서 이동상으로 사용할 수 있다. 본 연구에서는 초임계 C$O_2$에 변형제를 첨가시키는 새로운 방법을 개발하였고, 변형제로써 초임계 C$O_2$에 첨가된 수분(H$_2O$)의 양을 perfluorosulfonate ionomer(PFSI) film을 이용해 만든 amperometric microsensor로써 측정하였다. 이와같은 방법을 사용함으로써 포화 column보다 상당히 긴 시간동안 일정하게 수분을 첨가할 수 있었고, 실제로 이 방법을 사용하여 순수한 C$O_2$ 이동상만으로는 분리하기 어려운 몇 가지 살균제와 살충제에 적용한결과 좋은 크로마토그램을 얻었다. Supercritical Fluid Chromatography(SFC) has become a technique for solving problems that are difficult by other chromatographic methods. However, the most widely used fluid, is no more polar than hexane. Polar samples which are difficult to be analyzed with pure supercritical C$O_2$ because of their high polarity can be separated by adding polar modifiers to supercritical C$O_2$. In this paper, a new method for monitering the mobile phase composition in modified supercritical fluid chromatography was developed. The amount of water dissolved in supercritical C$O_2$ was measured by amperometric microsensor which is made of thin film of perfluorosulfonate ionomer (PFSI). The amount of water dissolved in supercritical C$O_2$ stayed constant for a much longer time than with a saturator column. With this new mixing device, we could do good separations for insecticides and fungicides which are difficult to separate with pure C$O_2$.
현장연속측정용 저온농축 열탈착기와 GC/FID를 이용한 환경대기 중 4가지 신규 지정악취물질 [메틸에틸케톤, 메틸아이소뷰틸케톤, n-뷰틸아세테이트, i-뷰틸알코올] 분석방법 연구
임문순,주도원,김형수,송기봉,박강호 한국냄새환경학회 2007 실내환경 및 냄새 학회지 Vol.6 No.3
In this study, we attempt to analyze for 4 compounds (MEK, MIBK, n-Butyl acetate, i-Butyl alcohol) in ambient air using on-line thermal desorber (on-line TD) with gas chromatograph/flame ionization detector (GC/FID). These compounds will be regulated by KMOE (Korean ministry of environment) within 2010. We tested two different experimentation. First, we try to find the influence of Nafion dryer for the 4 compounds. Second, we want to know basic analytical characteristic of target compounds through the linearity, reproducibility, and minimum detection limit. According to this study, target compounds are removed in Nafion dryer more than 80 percent, respectively. So, we progressed next experimentation progressed without Nafion dryer using hydrophobic cold trap. Results for each compounds showed good linearity (r²=0.99 upper) and good precision (RSD=1 % below). In additional, we analyzed the ozone precusors standard gas (56 compounds) using the same method to see if there are any peaks to be overlapped in ambient air. These results showed that there is no peak overlapped. This means that analytical system of this study could be used on-line analytical system. Minimum detection limit (MDL) value for this system are less than minimum malodor threshold concentration.
환경대기 중 환원 황 성분의 분석을 위한 측정기관간 내부정도관리 비교연구
송기봉,한진석,이민도,주도원,임문순,김태현,송희일,이명진,곽완순,윤재성,문서연,조성렬 한국냄새환경학회 2007 실내환경 및 냄새 학회지 Vol.6 No.1
In this study, QA/QC (quality control/quality assurance) data of reduced sulfur compounds from several institutes were obtained and compared based on the Korean standard method for off-odor. From the results, attempts were made to optimize the analytical conditions and improve the measurement reliability of reduced sulfur compounds analyses from detailed CF/TD and GC/PFPD information. Analysis results (minimum detection limit, precision, recovery rate) of reduced sulfur compounds based on the each analytical condition corresponded with the Korean standard methods for off-odor. Therefore, we expect that we could execute the exact analysis if we use the analytical condition of CF/TD and GC/PFPD in this study
On-line 열탈착기와 GC/FID를 이용한 환경대기 중 유기산 성분 [프로피온산, n-뷰티르산, n-발레르산, i-발레르산]들의 분석방법 연구
김종보,김태현,김태화,주도원,임문순 한국냄새환경학회 2008 실내환경 및 냄새 학회지 Vol.7 No.4
We studied an analytical method for 4 organic acids will be regulated in 2010 using on-line thermal desorber with gas chromatograph/flame ionization detector. Results for each compounds showed good linearity(r² > 0.99) and good precision(RSD < 3%). Minimum detection limit values are about 2~3ppb when we sampled 1.5 L. These values will be reduced to 0.4~0.5 ppb when sampling 10L. We analyzed the 56 ozone precursor standard gas using the same method to see if there are any peaks to be overlapped in ambient air and the results showed that there is no peak overlapped. The linearity, precision and MDL in this study satisfied the guideline of Korean standard method for 4 organic acids. This analytical method in this study could be utilized effectively as on-line monitoring instrument to detect 4 organic acids.
안산시 주거지역을 중심으로 한 환경대기 중 휘발성 유기화합물과 황계열 성분의 온라인 연속측정 연구
김기현,주도원,최여진,홍윤정,사재환,박종호,전의찬,최청렬,구윤서,Kim K.-H,Ju DW,Choi YJ,Hong YJ,Sa JH,Park JH,Jeon EC,Choi CR,Koo YS 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1
In this study, the concentrations of major odorous compounds including reduced sulfur compounds (OMS, CS$_2$, and DMDS) and aromatic VOC (benzene, toluene, xylene, etc.) were measured continuously using an on-line GC analytical system. Our measurements were made from a residential area of Ansan sity during about two week period of October, 2004. The highest mean concentrations of Sand VOC were found as 56.9 pbb of DMS and 21.7 ppb of toluene, respectively. The results of this study generally show that the pollution levels for both types of chemicals are significant relative to previous measurement results reported from comparable sites, if the results are compared simply in terms of the magnitude of the measured concentration data. Moreover, when the relative importance of different compounds is compared in terms of the odor strength, it indicated that the contribution of reduced S compounds may be much more important than that of VOC in the study area.
공단인근 주택가를 대상으로 환경대기 중 휘발성유기화합물과 황계열 성분의 연속측정
김기현,주도원,최여진,홍윤정,전의찬,최청렬,구윤서 한국대기환경학회 2006 한국대기환경학회지 Vol.22 No.6
In this study, the concentrations of major odorous compounds including reduced sulfur compounds(DMS, CS2,and DMDS) and aromatic VOC (benzene, toluene, xylene, etc.) were measured continuously using an on-line GCanalytical system. Our measurements were made from a residential area of Ansan city during about two weeksDMS and 21.7 ppb of toluene, respectively. The results of this study generally show that the pollution levels forboth types of chemicals are signicant relative to previous measurement results reported from comparable sites, ifthe results are compared simply in terms of the magnitude of the measured concentration data. Moreover, when therelative importance of different compounds is compared in terms of the odor strength, it indicates that thecontribution of reduced S compounds may be much more important than that of VOC in the study area.
환경 대기 중 ppt 수준의 황화수소 분석을 위한 GC 방식의 검량 기법에 대한 연구
김기현,오상인,최여진,최규훈,주도원 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.6
In this study, we investigated the analytical techniques to quantify the ambient concentration of hydrogen sulfide (H₂S) in air at ppt concentration level. For this purpose, an on-line GC analytical system equipped with both pulsed -flame photometric detector (PFPD) and thermal desorption unit (TDU) was investigated by collecting ambient air samples. The results of our study generally indicated that calibration conditions of GC system is highly sensitive to affect the accuracy of the analytical technique. Most importantly, we found that the use of different matrices in the the preparation stage of working standards was sensitive to control the overall performance of this technique. The calibration of our analytical system was tested by the two types of working standard (prepared by mixing either with high purity N₂or with the ambient air). According to this test, the latter represented more efficiently the detecting conditions of actual air samples. The peak occurrence patterns of both air samples and standards (prepared by mixing with ambient air) were altered in a similar manner as the function of the loaded volume; however, it was not the case for the N₂-mixed standards. Results of our study suggest that detection of H₂S is highly different from other sulfides and that its quantification requires minimizing interfering effects of non -pure substance (like water vapor) and (either sorptive or destructive) loss effects.