facile and rapid preparation of magnetic octadecylamine nanocomposite and its application as a capable adsorbent in magnetic dispersive solid phase extraction of some polycyclic aromatic hydrocarbons from wastewater samples

Polycyclic aromatic hydrocarbons (pahs) are a class of perilous carcinogenic compounds comprising of two or more fused aromatic rings [1]. these compounds are prevailing environmental contaminants that are formed during the incomplete combustion of organic materials. it has been postulated that long–term exposure to pahs is dramatically linked to human health threats such as lung cancers, reproductive abnormalities, dna damage, and cardiopulmonary mortality [2]. considering the stability and bioaccumulation risk of these compounds, development of a quick, sensitive, and simple analytical method for monitoring and determination of pahs in various industrial and environmental wastewaters is highly demanded. in this research, a highly-effective and reliable sorbent based on octadecylamine@fe3o4 was proposed and used in magnetic dispersive solid phase extraction (mdspe) procedure. the mdspe method was followed by dispersive liquid-liquid microextraction and employed for the extraction and preconcentration of some pahs (acenaphthene, phenanthrene, anthracene, pyrene, acenaphtylene, and benzo[a]pyrene) from wastewater samples. the developed process was performed by dispersing the nanoparticles into an aqueous sample solution containing the target analytes by vortexing. then the magnetic sorbent was collected by applying an external magnetic field followed by adding acetontrile to elute the analytes from the sorbent surface by vortexing for a few minutes. by utilizing an external magnet once again, the sorbent was separated, the attained eluent was mixed with an extraction solvent at µl–level and speedily injected into deionized water. after centrifugation, the enriched analytes were determined using a gas chromatograph equipped with flame ionization detection. it is worth mentioning that preparation of the utilized sorbent is effortless, convenient, and completed in nearly 2 h. good figures of merit including high enrichment factors (506–676) and extraction recoveries (63–84%), wide linear ranges of the calibration curves, and low limits of detection (0.11–0.30 µg l-1) and quantification (0.40–1.0 µg l-1) were achieved in the present approach.