Abstract
The effect of column temperature on the gas chromatographic separation of chloro-, bromo- and iodo-methanes, -ethanes and -ethenes with one or more of the same or different halogen atoms in the molecule was investigated by using non-polar (OV-1) and polar (SP-1000) stationary phases. Retention indices, I, at 75, 100 and 125°C were measured and their correlation with the structures and boiling points of the compounds was examined. A linear correlation between vapour pressure and I was found for the non-polar stationary phase, which permits the peak separation at any temperature to be predicted. On the polar column, this correlation is too poor for extrapolation of retention values at different temperature. An Antoine-type equation, the constants A, B and C of which can be calculated starting from experimental values, was found to be useful for the calculation of I values at any temperature on both the polar and non-polar stationary phases.
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