GAS-CHROMATOGRAPHIC IDENTIFICATION OF COMPLEX-MIXTURES OF HALOMETHANES AND HALOETHANES BY USING THE CORRELATION BETWEEN THEIR RETENTION AND VAPOR-PRESSURE

The linear correlation between relative retention values of halogenated hydrocarbons (methanes, ethanes and ethenes) having one or more identical or different halogen atoms in the molecule and their vapour pressures was used for identification purposes in gas chromatography. Absolute and relative retention values were measured at various temperatures on non-polar (OV-1) and polar (SP-1000) packed columns, and some correlations were found that permit peak identification. The calculation of retention times when the vapour pressures of the substances are known or, on the contrary, the calculation of this parameter on the basis of gas chromatographic analysis are possible.