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建立了气相色谱-质谱法测定甲醇汽油中醇类助溶剂的分析方法。在优化的实验条件下,采用选择离子法确定定量离子和参考离子,消除汽油中干扰组分的影响。C2~C8醇体积分数在0~0.03%范围内与峰面积具有良好的线性关系,相关系数均在0.997~0.999之间;检出限在6.0×10-4%~3.0×10-3%之间;分析时间小于15 min。重复测定6次的相对标准偏差小于4.0%,回收率在93.8%~105.3%。
An analytical method for the determination of alcohol co-solvents in methanol-gasoline by gas chromatography-mass spectrometry was established. Under optimized experimental conditions, ion-selective methods were used to determine the quantitative ions and reference ions to eliminate the influence of interfering components in gasoline. The volume fraction of C2 ~ C8 alcohol had a good linear relationship with the peak area in the range of 0% ~ 0.03% with the correlation coefficients between 0.997 and 0.999. The detection limits were 6.0 × 10-4% ~ 3.0 × 10-3% Between; analysis time is less than 15 min. The relative standard deviations of 6 replicates were less than 4.0% and the recovery rates were 93.8% -105.3%.