Liquid-liquid microextraction and spectrophotometric determination of anionic surfactants using Astra Phloxine FF

摘要

A novel and simple procedure for determination of anionic surfactants has been developed. The method is based on the reaction of sodium dodecyl sulphate (SDS) with Astra Phloxine FF reagent at pH 3-8, followed by liquid-liquid microextraction of the formed ion associate into an organic phase containing a mixture of carbon tetrachloride and dichloroethane (4:1, v/v) and subsequent UV-Vis detection at 555nm. The calibration plot was linear in the range 0.006-0.29mgL(-1) of SDS. The limit of detection (LOD), calculated based on 3s, is 0.002mgL(-1). The method was applied to the determination of anionic surfactants in real wastewater samples.