Abstract
Abstract A high-performance, liquid-chromatographic procedure is presented that rapidly and quantitatively separates alkylbenzene sulfonates according to their alkyl chain length and structure. The separation employs octadecylsilanized silica gel as a stationary phase and an aqueous acetonitrile solution of tetrabutyl ammonium chloride (TBAC) as the mobile phase. The TBAC acts as an ion-pair reagent and suppresses the ionic nature of the sulfonates. Separation is effected by gradients in TBAC concentration and mobile phase polarity. The concentration of each component is then quantitatively measured by a UV detector. Gradient selection and sample matrix effects are discussed. Several examples are presented that demonstrate the utility of this analytical procedure.
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