模拟保留指数法分析汽油族组成

传统上用气相色谱正构烃类为基准的Kovats保留指数或线性保留指数对汽油的组份进行定性，分析汽油族组成．但此方法有一定的局限性，一是不适合多阶程序升温过程的分析，其次是对于烯烃含量较多的汽油用软件自动识别分析时，需人工干预，色谱峰总的识别率经常低于90.0％．提出了模拟指数的概念和计算规则．采用模拟保留指数定性，色谱峰识别准确，色谱峰总的识别率一般能达99．5％以上．

The PONA Analysis of Gasoline By Using Simulation Retention Index Method

The traditional methods with Kovats' retention indices or linear retention indices are used to identify the components for the PONA analysis of gasoline by gas-liquid chromatography. These methods exist some disadvantages to limit the scope of applications, such as multistage temperature programmed operation and analyses for poor-paraffin or rich-olefin gasoline samples. In the paper, a new concept simulation retention index is proposed and a method based on simulation index is developed for the PONA analysis of rich-olefin gasoline. The equation for the calculation of simulation index is the same as that for linear retention index. However, the meaning, calculation rules and scope of application of the simulation index are different from linear retention index. It is important to select rationally the reference peaks for new method with the simulation index. The ratio of chromatographic peaks to recognize accurately achieves over 99.5%.