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이온교환 수지에 대한 벤젠폴리칼 복시산들의 흡착성에 관한 연구
이대운,김영환,유의경 연세대학교 대학원 1980 延世論叢 Vol.16 No.2
Absorption behavior of benzene polycarbofylic acids such as benzoic, phthalic, trimesic, hemimellitic, trimellitic, pyromellitic, and mellitic acid, on Amberlite CG-400 and on XAD-2 was studied. In order to investigate sorption mechanism of these acids, effect of pH, concentration of MeOH, and other inorganic ion on long D value were studied. Several acids were separated by Amberlite CG-400, Cl- resin With ZnCl2-, NiCl2- and CdCl2- MeOH solutions
李大云,李垣,金珠姬,李承頀 연세대학교 대학원 1981 延世論叢 Vol.18 No.1
The application of the solvent-impregnated resin(SIR), 5,7-dibromo-8-hydroxyquinoline(DBQ)-impregnated polyurethane foam, to the selective recovery of some heavy metal ions from aqueous solution was investigated. The adsorption behavior of DBQ on polyurethane foam was studied to determine the optimum conditions for preparing the SIR. It was found that SIR impregnated with DBQ had adsorption capacity about 5×10-2 mmol M(II) per gram foam. The conditions for recovery and readsorption of metal ions were determined.
폴리우레탄 포움에 의한 방향족 니트로화합물의 흡착성에 관한 연구
문영자,정용순,이대운 연세대학교 교육대학원 1982 연세교육과학 Vol.21 No.-
방향족 니트로화합물의 open-pore polyurethane foam(OPP foam)에 의한 흡착성에 영향을 미치는 여러가지 인자 즉 진탕시간, 용액의 pH, 시료분자의 이온화상수, 유기용매의 농도 등에 따른 분포계수(Kd)를 측정함으로써 분자구조와 관련하여 검토하였으며 흡착현상을 AmberiteXAD-2수지에 대한 흡착과 비교하여 그 흡착메카니즘을 규명하였다. 니트로유기화합물은 benzene, benzoic acid, aniline, phenol의 유도체이며 8-hydro-xyquinoline도 아울러 시도하여 보았다. OPP foam에 대한 방향족 니트로화합물의 기본흡착은 분자흡착이며 이들 분자와 OPP foam메트릭스사이의 반텔바알스인력과, OPP foam의 작용기와 시료의 작용기와의 쌍극자-쌍극자 및 수소결합에 기인하는 것 같다. OPP foam에 대한 방향족 니트로화합물들의 흡착력은 일반적으로 시료분자의 분자량 증가 및 소수성의정도가 클수록 강하고, 중성분자상태에서 최고가 되고 온도가 증가하고, 유기용매의 농도가 증가할수록 흡착이 감소되었다. 또한 시료의 극성 및 이온화상수가 클수록, pKa가 작을수록 Kd값은 감소되었다. 한편 OPP foam에는 tri-n-butylphosphate(TBP)와 같은 가소제(plasticizer)가 쉽게 침윤되므로 TBP-OPP foam을 사용하면 유기화합물의 Kd값을 OPP foam 만의 Kd값보다 크게 증가시킬 수 있으며 OPP foam에 의한 금속이온의 흡착 및 제거실험법으로 그 응용이 가능하다. The adsorption behaviors of nitro compounds of benzene, benzoic acid, phenol, aniline and 8-hydroxyquinoline (8-HQ) have been investigated. Distribution coefficients have been determined by batch method to study absorption mechanism of nitro compounds on open-pore polyurethane foam (OPP foam) by changing pH, methanol percentage of the medium. The adsorption behaviors of the aromatic nitro compounds on OPP foam are likely due to van der Waal's attraction between the organic molecule and foam matrix, as well as due to hydrogen bond and dipole-dipole interaction between the functional groups of organic molecule and hydroxy or amide group of foam matrix. OPP foam and XAD-2 have shown the following. similar adsorption behaviors for nitro compounds ; Adsorption of organic compounds is molecular adsorption. Distribution coefficients decreased with increasing methanol percentage of the medium. Nitro compounds which have more hydrophobic group have larger distribution coefficient than that of more hydrophilic group.
Dai Woon Lee,Byung Yun Cho Korean Chemical Society 1993 Bulletin of the Korean Chemical Society Vol.14 No.4
The retention behavior of proteins was investigated by using hydrophobic interaction chromatography (HIC), comparing to the results obtained in reversed-phase chromatography (RPC) described in the previous paper. A SynChropak propyl column was employed with 0.05 M phosphate buffer (pH 7.0) containing sodium sulfate. Conformational changes were recognized by examining Z values as a function of sodium sulfate concentration over a range of temperature between 5 and 65$^{\circ}C$. Z values did not change significantly at the range of the temperature showing the consistent ${\Delta}H^{\circ}$ and ${\Delta}S^{\circ}$ values. The sign and the magnitude of ${\Delta}H^{\circ}$ and ${\Delta}S^{\circ}$ of proteins in HIC were compared with those obtained in RPC. The signs of ${\Delta}H^{\circ}$ and ${\Delta}S^{\circ}$ of proteins in HIC were all positive, while those of proteins in RPC were all negative. These results suggested that the retention of proteins in HIC and in RPC were entropy-driven and enthalpy-driven process, respectively. From the two different investigations, it was concluded that the retention mechanism of RPC and HIC was based on the same fundamental principle in which separation is dependent on hydrophobicity, but the retention behavior of the proteins in HIC is clearly different from that observed in RPC.
沃川地向斜帶에서 火成活動에 의한 鑛化作用의 類型에 關한 硏究
Dai Sung Lee(李大聲),Jeong Mann Chi(池楨蔓),Dai Woon Lee(李大云) 대한자원환경지질학회 1980 자원환경지질 Vol.13 No.3
The granitic plutons associated with Ogcheon geosynclinal zone can be grouped into three different subzones; SE-Subzone for the migmatitic and schistose granites of the southeast margin, 101-181m.y. old; NW-Subzone for those of the northwest margin, 112-163m.y. old; and C-Subzone for those of central part of the zone, 63-183m.y. old. The intrusives in C-Subzone are further subdivided into the older, adamellite to granodiorite (148-183m.y. old) and the younger, perthitic granites (63-106m.y. old). The metallogenic distribution of South Korea suggests that, in the Ogcheon Zone, it is possible to delineate an elongated polymetallogenic province in the general orientation of the zone intimately related with the migmatite and plutonic zones mentioned. Moreover, the mineralization in the province was basically controlled by the patterns of local geology involving country rocks and related igneous bodies, that permit subdivision of the province into the following three parts: Northeast (NE) Province consists dominantly of thick Paleozoic calcareous sediments; Middle (M) Province is characterized by predominant argillaceous and partly calcareous sediments of Precambrian to Late Paleozoic age; and Southwest (SW) Province consisting mainly of volcanic and arenaceous sediments of Mesozoic age. The three different plutonic zones with three different country rock provinces above mentioned make a combination which consists of nine classes. Each class can be assumed to be characterized by specific mineralization type. In order to classify the mineralization types, the present study sampled twenty six ore deposits and mineralized areas in Ogcheon zone as shown figure 2; eight ore deposits from plutonic SE-Subzone, ten from the plutonic NE-Subzone and eight from the plutonic C-Subzone. The characteristics of the classes are as follows: NE-SE is predominant in Au-Ag vein and Sn-migmatite of katazonal occurrence; NE-C is most productive in Pb-Zn and remarkable in Fe contact deposit in mesozone and partly Pb-Zn-Cu skarn in limestone and subordinate in mesozone and partly Pb-Zn pipes; M-SE is considerable in Au-Ag vein and rare elements (Nb, Ta, etc.) of pegmatite; M-C is predominant in F-veins in epizone and Mo-W, Fe, Cu veins occur in replacement type; M-NW is productive in Fe metamorphic and skarn types, partly remarkable in Cu, Pb-Zn contact; SW-SE is barren in mineralization related to Jurassic igneous rocks; SW-C is predominant in alunite and pyrophyllite in tuffs; and SW-NW is scarece in Pb-Zn, Cu, As and Au-Ag veins.
Determination of Pesticide Residues in Water using On-line SPE-HPLC Coupling System
Lee, Dai Woon,Lee, Sung Kwang,Park, Young Hun,Paeng, Ki-Jung 한국분석과학회 1995 분석과학 Vol.8 No.4
The on-line SPE-HPLC coupling system was developed for the efficient separation and determination of trace pesticides, such as phenoxyacetic acids and esters, and triazines in aqueous solutions. By using the developed SPE-HPLC on-line system, the band broadening usually observed in single precolumn switching mode was greatly reduced, consequently, the quantitative determination of trace pesticides could be achieved, Besides, since most of the analytes preconcentrated by SPE column could be injected directly into HPLC system, the limit of detection can be improved down to ppt level.