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KMID : 0385520120250060382
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Analytical Science & Technology
2012 Volume.25 No. 6 p.382 ~ p.387
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Determination of the mole fractions of ethylene oxide and freons in medical liquefied gas mixture by GC/AED
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Kim Hyun-Joo
Kim Dal-ho
Kim Jin-Seog
Lim A-rang
Lee Taeck-Hong
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Abstract
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Ethylene oxide (C2H4O, EtO) is used as a raw material for the production of ethylene glycol and other industrially important material such as ethanolamines and also used as a disinfecting agent. It is applied for gas-phase sterilization of thermally sensitive medical equipment, and for processing of storage facilities as a mixture with fluorinated hydrocarbon. In this perspective, accurate determination of the mole fractions of components in the liquefied gas mixture is required for the quality control and safety of production and use. Each component of the liquefied gas mixture has different chemical and physical properties such as vapor pressure and boiling point. Therefore, we can suppose that analytical results can be different according to the introduction method for the gas phase of upper layer, or for the liquid phase of lower layer in gas cylinder. In this study, we designed a new on-line sample injection device for the liquefied gas mixture in liquid or
gas state, and applied to the analysis of liquefied gas mixture of ethylene oxide and fluorinated hydrocarbons by GC/AED (gas chromatograph-atomic emission detector). We studied performance of AED, and effect of sample introduction and selected wavelength to the accuracy and repeatability of analytical results.
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KEYWORD
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standard gas, GC/AED, liquefied gas, mole fraction, ethylene oxide, hydrofluorocarbon, on-line sample injection device
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