6533b833fe1ef96bd129c169

RESEARCH PRODUCT

Gas—liquid chromatographic analyses

subject

description

Abstract The gas chromatography (GC) of n -alkyl acetates (CH 3 COOR), chloroacetates (CH 2 ClCOOR), dichloroacetates (CHCl 2 COOR) and trichloroacetates (CCl 3 COOR), where the alcohol chain length (R) varied between 1 and 8, and certain of their monochlorinated derivatives, 176 compounds altogether, has been studied on SE-30 and OV-351 glass capillary columns under the same operating conditions. The isomeric monochlorinated esters are eluted in direct order from the 1- chloro to the ω-chloro isomer, the separation of the isomers being complete on OV- 351. On SE-30, however, the peaks of the 6- and 7-chlorooctyl esters are partly overlapped. The separation of the mixtures of odd- and even-carbon-number esters was better on a non-polar column. The GC analysis of the combined mixtures of all isomers resulted in several overlapping peaks, particularly with the chloroacetates. The isomeric chloro esters are eluted on SE-30 in the order mono-, di- and trichloro isomers, whereas on OV-351 the di- and trichloro esters are eluted in the reverse order while the 1-chloroalkyl C 2  C 8 trichloroacetates are eluted before the corresponding monochloro isomers. A different elution order of the compounds is observed on a polar column, 1 -chloro and ω-chloro isomers giving rise to the greates difference in elution order. The gas chromatograms of the mixtures and the relative retention times of the compounds are given.