HPLC Determination of Linear Alkylbenzenesulfonate (LAS) in Aquatic Environment. Seasonal Changes in LAS Concentration in Polluted Lake Water and Sediment

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Abstract
An analytical method for linear alkylbenzenesulfonate (LAS) using HPLC was studied. It was found that the peaks of different LAS isomers with alkyl chain lengths between 11 and 14 could be separated by gradient elution with aqueous NaClO4 solution and acetonitrile. The pretreatment of the LAS in the environmental samples was studied and an easy-to-use method involving solvent extraction with 4-methyl-2-pentanone was developed. By using these techniques the concentrations of the different LAS analogues in environmental samples could be measured respectively. The method was used to determine LAS in the aquatic environment; and the seasonal changes of these chemicals were clearly observed.