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Kovats提出的保留指数原系用于恒温分析,但由于要分析的样品越来越复杂,往往必须使用程序升温操作。van den Dool采用保留温度来计算程序升温下的保留指数,虽然计算方法简单,但只适用于单纯直线升温而不含恒温阶段的操作过程,其应用受到很大限制。Majlat等人的方法可应用于多阶升温,多阶恒温的过程,论述十分详尽。其关键是采用了Takacs等人推导的压力校正因子计算式:
The retention index proposed by Kovats was originally used for thermostatic analysis, but due to the ever-increasing complexity of the samples to be analyzed, it is often necessary to use programmed warming operations. van den Dool uses the retention temperature to calculate the retention index at programmed temperature. Although the calculation method is simple, it is only applicable to the operation of simple linear heating without thermostatic phase, and its application is greatly limited. The method of Majlat et al. Can be applied to the process of multi-stage heating, multi-stage thermostat, and the discussion is very exhaustive. The key is to use Takacs et al derived pressure correction factor calculation formula: