Determination of sodium bis(2-ethylhexyl)sulfosuccinate (AOT) surfactant with liquid chromatography: Comparative study of evaporative light scattering detector, ultraviolet detector and conductivity detector

This work presents comparison of performance of ultraviolet (UV) detector, conductivity detector (CD) and evaporative light scattering detector (ELSD) in terms of quantitative analysis of AOT (sodium bis(2-ethylhexyl)sulfosuccinate) using liquid chromatography. The employed chromatographic condition, including an acetonitrile/water (45:55, v/v) isocratic eluent system, is suitable for the three different detectors, and the figures of merits obtained by building up calibration plots are compared. The sensitivities of the detectors are in the order of ELSD ? CD >> UV detector. The linear range for quantification of AOT depends on the type of detector: the lower limits are in the order of UV detector (207 ? mL-1) < CD (310 ? mL-1)