Determination of the Content of Methanol in Xinmian Xu by Headspace Gas Chromatography
Objective To establish a method for determining the content of methanol in Xinmian Xu by headspace gas chromatography.Methods The part of gas chromatograph:gas chromatographic column(Agilent DB-624,30 m× 0.530mm,3μm)and the column temperature was programmed(0→8 min,50 ℃;8→13 min,50→65 ℃;13→18.4 min,65→200 ℃;18.4→28.4 min,200 ℃),the injector temperature was 200 ℃,N2 was the carries gas and the flow rate was 3 ml/min,the temperature of flame ionization detector(FID)was 220 ℃,the flow rate of H2 and air were 30 ml/min and 300 ml/min,respectively,the split ratio was 30:1.The part of headspace:the temperature of heating box,quantitative ring and transmission line were 85 ℃,95 ℃,and 110 ℃,respectively,the balance time of samples and cycle time were 20 min and 40 min,respectively,the injection volume was 1 ml.Results Methanol has a good linear relation-ship in 0.0005％～0.1％ml/ml,y=2832.30x+0.48(R2=0.999);the sample recovery rate was ≥98.55％,and the relative standard deviation(RSD)was ≤ 1.39％;the RSD of median precision was 0.89％.Conclusion A method for determining the content of methanol in Xinmian Xu has been developed in this study,it has good linearity and accuracy and can be used to determine the content of methanol in Xinmian Xu.
Headspace gas chromatographyXinmian XuMethanolQuality standardsContent determination
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万方数据
