Synthetic surfactants are toxic pollutants in natural waters. Otherwise, large amounts of synthetic surfactants are widely used in industrial and domestic detergents, which always cause pollution in environmental waters. Thus, it is necessary to determine these surfactants in water for the evaluation of pollution from industrial and domestic wastes [1. Liu and Lee reported a novel liquid–liquid microextraction technique which was termed continuous-flow microextraction (CFME) to provide higher enrichment in a much shorter time. This study presents a new version of the CFME method called continuous sample drop flow-based microextraction (CSDF-ME) reported by Soleyman Moinfar. The performance of CSDF-ME method is tested by the determination of benzene, toluene, ethyl benzene, and xylenes (BTEXs) in the water samples using gas chromatography flame–ionization detection (GC–FID) [2.
