چكيده به لاتين
Electromembrane extraction has received much attention due to its advantages, such as selectivity and significant concentration factors. In this process, which is the extraction based on the electric membrane, the desired species under the electric field from the aqueous samples, passing through the organic solvent stabilized in the membrane pores, enter the receiving phase inside the membrane channel. Three-phase electromembrane extraction, organic solvent, SLM, and acceptor phase are different from each other. The hollow membranes used in electromembrane extraction are mostly commercial fiber type and polypropylene, with a maximum diameter of 1.6 mm. In this study, the membrane used in the electromembrane extraction process is a double-layer polymethyl methacrylate/polyacrylonitrile microfiber. It is made by an electrospinning machine equipped in the laboratory, and the diameter of the hollow fiber prepared is 2 mm. It should be noted that the inner layer of microfiber is sprayed on the collector and the purpose of spraying this polymer is to reduce the adhesion of the fiber on the collector roller, and as a result, it is easier to separate the fiber. The fiber prepared in the extraction of nicotine was used as a model molecule at a concentration of 1 μg/ml and then measured by a high-performance liquid chromatography device. The applied voltage, extraction time, and pH are the factors affecting the extraction process and were optimized by the response surface method based on central design. The optimal points were calculated as 4-6, 54-57, and 29-31, respectively. In addition, the distance between the electrodes, the stirring speed, and the volume of the acceptor and donor phases were considered constant parameters. The reproducibility of the method is calculated as 5/08%.
