The chain length distribution of sulphonated surfactants was determine
d by high resolution capillary gas chromatography. Prior to analysis t
he sulphonate functionality was converted into the methyl ester deriva
tive. Two methods of derivatisation were investigated and compared. Th
e procedure was used for the major types of anionic surfactants includ
ing alkane sulphonate, alkylbenzene sulphonate and alpha-olefin sulpho
nate.