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介绍了测定汽油中C_5—C_7馏分的28个单体烃的气液色谱方法.在最佳的操作条件下,用季戊四醇酯的色谱柱得到了23个色谱峯;用氯萘的色谱柱得到了21个色谱峯.综合两色谱柱所得结果,就可以得到28个单体烃的含量.文中列出了各单体烃在两柱上的相对保留时间及保留体积值,保留体积的对数值与碳原子数呈线性关系.用配制的已知组成试样验证本方法的绝对误差在1％左右,对直馏汽油及石油二次加工汽油平行测定差值为1％.文中还讨论了柱温对分离的影响及不同极性固定液的选择性.试验是在自制的气液色谱仪上进行的,采用热敏电阻热导池作鉴定器.本方法分析一个试样约需4小时.
A gas-liquid chromatographic method for the determination of 28 monomer hydrocarbons in the C_5-C_7 fraction of gasoline was presented. Under the optimum operating conditions, 23 peaks were obtained with a pentaerythritol ester column; 21 chromatographic peaks.Combining the results of two chromatographic columns, the content of 28 monomer hydrocarbons can be obtained.The relative retention time and retention volume of each monomer in two columns are listed, the logarithm of retention volume and The linear relationship between the number of carbon atoms.With the known composition of the sample prepared to verify the absolute error of this method is about 1%, straight-run gasoline and petroleum secondary processing of gasoline parallel determination of the difference of 1% .The article also discusses the column temperature On the separation and the selectivity of different polar fixatives.The experiment was carried out on a homemade gas-liquid chromatograph using a thermistor thermal conductivity cell as a detector.The method of analyzing a sample takes about 4 hours.