Preparation of barium sulfate-coated magnetite particles for the extraction of trimethoprim from environmental water samples based on mixed hemimicelles solid-phase extraction

摘要

In this study, barium sulfate-coated magnetite particles (Fe3O4/BaSO4) for mixed hemimicelles solid-phase extraction, have been successfully synthesized by a chemical coprecipitation method. Fe3O4/BaSO4 modified by sodium dodecyl sulfate (SDS) was applied for the extraction of trimethoprim from environmental water samples. Compared with other substrates, such as alumina, silica and titanium dioxide, Fe3O4/BaSO4 particles have better stability and resistance to acidity and alkalinity. A comprehensive study on the adsorption conditions, such as the amount of SDS, pH value, standing time, desorption solvent and the maximum extraction sample volume was presented. Good recovery (72.3a€“85.0%) and high concentration factor (800) were achieved using only 0.1 g of Fe3O4/BaSO4 and 20 mg of SDS. The detection and quantification limits of the proposed method were 0.05 and 0.16 ??g La?’1, respectively. It shows great analytical potential in the preconcentration of organic compounds from large volume water samples.