Determination of Methanol in Wine by Head Space GC with Capillary Column
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Abstract:
In this paper, through four factors such as temperature, time, the ratio of gas-liquid phase and salting out, the determination of methanol in wine by head space GC with capillary column was studied and the optimal conditions were found as following: using a Phenomenex ZB-WAX chromatographic column and a FID detector. The split ratio was 20 with split liner tube (2mm I.D) and the flow rate of carrier gas was 2.0 mL/min. The heated temperature was 70℃ with head space sampling used and vial equilibration time was 15 min and sample volume was 5 mL in a 20mL vial. The linear of this method was satisfied when the concentration of methanol was at the range of 10.2~407.6 mg/L (r=0.9997). The lowest method detection limit was 8.5 mg/L and the average recovery rate was 99.2%. RSD of Repeat was 1.4%. It was shown that this method is more simple and efficient than GC method in GB/T15038-2006, and the result was reliable.
