Abstract
The chlorobenzene isomers are used extensively as intermediates in a wide range of chemical products. More recently their determination in environmental situations has become of considerable importance and chromatographic procedures have been widely reported for their determination in both trace and major amounts. There are over 220 publications in which gas chromatography (GC) has been applied to the analysis of chlorobenzene. However, over 60 o/o of these works refer to the separation of only one isomer. Relatively few publications’-8 consider all the isomers, although the use of both capillary3’ and packedcolumns with polar and non-polar stationary phases has been reported. Temperature programming and isothermal operation have been used, with retention times, relative retention times and retention ratios being variously reported. The effect on retention of increasing chlorine substitution has not been reported and this paper shows the incremental effect in terms of retention indices on a non-polar (SE-30) and a polar (Carbowax 20M) capillary column. The elution order of the isomers is compared with that reported previously.
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