Comparison of 10% CO2-N2 and 5% CH4-Ar gas mixture as a make-up of gas chromatography with electron capture detection (GC-ECD) for the measurement of sulfur hexafluoride (SF6) was investigated. It was found that 10% CO2-N2 shows the make-up characteristic comparable to 5% CH4-Ar. Thus, 10% CO2-N2 is considerable as an alternative to 5% CH4-Ar.
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