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노경호,이윤용 ( Kyung Ho Row,Youn Yong Lee ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6
According to the Montreal Protocol, CFC 113(1,1,2-trichloro 1,2,2-trifluoroethane), one of the ozone-depleting substances, will be prohibited to use as a cleaning solvent essentially in the electronic industry. Therefore, the development of the alternative cleaning solvents to CFC 113 is being accelerated. As one of the main characteristics of solvents, the solubility is theoretically calculated using the activity coefficient of solute from Scatchard-Hildebrand relation and the solubility parameters. Abietic acid is a major constituent of the rosin-based flux used for PCB soldering, and is designated as a contaminant. The cleaning solvents used in this work include water, acetonitrile, methanol, IPA, acetone, d-limonene, trichloroethylene, 1,1,1-trichloroethane, chloroform, methylene chloride, carbon tetrachloride, perchloroethylene as well as CFC 113. By use of a non-linear regression technique, the mole fraction solubilities are calculated and the heat of fusion of abietic acid is found to be 8831 ㎈/g-㏖. The results show that for the polar solvents(water, acetonitrile and methanol), the mole fraction solubility can not be calculated using the Scatchard-Hildebrand relation, but for the other nonpolar solvents, the agreements between the calculated and the experimental solubilities are relatively good.
Capillary Zone Electrophoresis 에서 Deoxyribonucleotides 의 분리
노경호 ( Kyung Ho Row ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.2
The effects of the addition of isopropanol as a organic modifier and the effects of concentration of sodium dodecyl sulfate(SDS) in capillary zone electrophoresis are discussed in terms of resolution using the four deoxyribonucleotides of dAmp, dGmp, dTmp, and dCmp. The system is consisted of a 60 ㎛ i.d. fused silica tubing(68.5 ㎝ column length), a high-voltage power supply, and an UV detector set at 254 ㎚. The effects of the eight different mobile phases on the column efficiency and resolution were compared to find the optimum mobile phase. The experimental results showed that the mobile phase of phosphate/Tris with 0.05 M SDS was most suitable for the separation of the components and the column efficiency(Number of theoretical plates) and resolution were affected by the separation voltage.