Abstract
The elution temperatures and degree of separation of a model system series of hydrocarbons were followed as functions of the rate of temperature programming and carrier gas velocity. Graphs are presented that permit individual assessment of these variables. Lower elution temperatures can be achieved by raising the carrier gas velocity or lowering the rate of temperature programming. In glass capillary columns of normal dimensions (0.25-mm i.d. × 50 m), the former is much less effective and results in lower column efficiency. The elution temperature of n-pentadecane varied from 139 to 309°C and the separation efficiency of the column decreased by 50% as the program rate varied from 1 to 32°C/min at constant pressure drop. A simplified glass inlet splitter and constant pressure-drop device is also described.
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