simultaneous extraction and preconcentration of benzene, toluene, ethylbenzene and xylenes from aqueous solutions using magnetite–graphene oxide composites

For simultaneous extraction and determination of benzene, toluene, ethylbenzene, m,p-xylenes, and o-xylene (btex) gas chromatography -flame ionization detector (gc-fid) and magnetic dispersive micro-solid phase extraction were used for real water samples. to have an efficient sorbent, magnetic graphene oxide (fe3o4@go) was synthesized and utilized in the process of microextraction. the analytes were adsorbed by vortexing, supernatant was decanted using a magnet, and the sorbent was eluted using a proper solvent. screening and optimizing significant variables in the process of microextraction were carried out following a two-stage approach, including plackett-burman screening design, and central composite design, accompanied by response surface analysis. the ranges of linear dynamic were 10 - 3000 ng ml– 1 and limits of detection were 3-10 ng ml^– 1. the relative standard deviations of the intra-day and inter-day were blow 8.0 and 10.0% (n=5), respectively. the introduced technique was implemented in real water samples successfully, and the relative percentages of recovery determined for the spiked water samples at 200.0 ng ml^– 1 ranged from 80.3 to 103.0%.