【摘要】 <正> 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:更多还原

【Abstract】 A method is suggested for the calculation of retention index in programmed temperature open tubular GC when the programming goes through the following stages: (1) the temperature is at first kept constant from T to Tn(2) temperature is increasing linearly from T1 to T2, (3) temperalure is again kept constant after T2 The net retention volumes of peaks eluted at these stages are then calculated with the following formulas:The retention index RI is then calculated as follows:where x represents the individual solule, n and n + i the normal paraffins with carbon atom numbers n and n + i respectively.更多还原