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KMID : 0385520170300050240
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Analytical Science & Technology
2017 Volume.30 No. 5 p.240 ~ p.251
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Determination of trace impurities of HFC-134a by gas chromatograph with atomic emission detector (GC/AED)
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Kim Myeong-Ja
Lim Jeong-Sik
Lee Jin-Bok
Lee Jeong-Soon
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Abstract
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1,1,1,2-Tetrafluoroethane (HFC-134a), which is used as refrigerant in air conditioners, has been recently regulated as a greenhouse gas and is recommended for reuse by refining. It is very important to quantitatively analyze trace impurities present in the refrigerant to evaluate the criteria for reuse. In this study, trace impurities including C, H, Cl, and F, which are difficult to quantify because there are no reference materials, were quantitatively analyzed by a gas chromatograph-atomic emission detector (GC/AED); for this analysis, this was preceded by a qualitative analysis with a GC-mass selective detector (GC/MSD). In addition, the AED response was investigated using a hydrocarbon mixed reference material, which was proportional to the number of atoms in the component. Fifteen refrigerant components were detected as trace impurities in HFC- 134a by qualitative analysis of trace impurities including C, H, Cl, and F in the samples. Based on the results of the qualitative analysis, quantitative analysis of trace impurities using AED showed that the highest mole fractions were for the CHClF2 component (45438.38 μmol/mol) in one sample and for the C2H2ClF3 component (1311.47 μmol/mol) in another sample. From this study, it has been shown that it is possible for this analytical method to be applied to the qualitative and quantitative analysis of trace compounds in refrigerants, which are difficult to quantify because of the absence of reference materials.
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KEYWORD
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gc/aed, trace impurity, linearity test, certified reference material, matrix effect
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