Abstract：At present,some alcohol, ether and ester additives were illegally added into gasoline in some gasoline stations, which resulted in potential hazards to the maneuverability, safety and environmental protection of vehicles. In response to this phenomenon, the analysis method of 19 types of alcohol, ether and ester additives in gasoline was established by gas chromatography mass spectrometry. The main analytical conditions were optimized by experiments. The optimal split ratio was 1∶100. The solvent was n-undecane and the dilution factor was 10-100. Meanwhile, the switch time of solvent was also investigated. The quantification ion and reference ion were determined by selected ion method (SIM), which could effectively eliminate the influence of complex components on target components in gasoline. The peak area of each target component against the corresponding mass concentration was plotted. It was found that the linearity was good when the mass concentration of methanol and ethanol was in range of 5.0-100.0 mg/L, and the mass concentration of other compounds was in range of 1.0-20.0 mg/L. The linear correlation coefficients of calibration curves were between 0.998 6 and 0.999 9. The detection limits of components were between 0.5 mg/L and 1.0 mg/L. The precision and accuracy tests of actual samples containing standard solution were performed. The relative standard deviations (RSD, n=8) of 19 components were between 2.1% and 6.2%, and the recoveries were in range of 85%-108%. The common gasoline samples (92#, 95# and 98#) were determined according to the experimental method. It was found that some samples contained oxide additives such as methanol, methyl tertiary butyl ether (MTBE) and sec-butyl acetate. The mass concentration was in range of 20-1200 mg/L.
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LIN Hai,LIAO Jian-meng,LI Chun-xiong,LI Zhan-jiang,LI Dan,ZHOU Ming-hui. Determination of alcohol,ether and ester additives in gasoline by gas chromatography mass spectrometry. , 2016, 36(6): 50-54.
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