TY - JOUR ID - 118260 TI - Simultaneous Extraction and Preconcentration of Benzene, Toluene, Ethylbenzene and Xylenes from Aqueous Solutions Using Magnetite–Graphene Oxide Composites JO - Chemical Methodologies JA - CHEMM LA - en SN - 2645-7776 AU - Ameri Akhtiar Abadi, Mohammad AU - Masrournia, Mahboubeh AU - Abedi, Mohamad Reza AD - Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran AD - Department of Applied Chemistry, Quchan Branch, Islamic Azad University, Quchan, Iran Y1 - 2021 PY - 2021 VL - 5 IS - 1 SP - 11 EP - 20 KW - graphene oxide KW - Magnetic adsorbent KW - magnetic dispersive micro-solid phase extraction KW - BTEX DO - 10.22034/chemm.2021.118260 N2 - 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%.   UR - https://www.chemmethod.com/article_118260.html L1 - https://www.chemmethod.com/article_118260_ef5f9931b4a5ea91a77da605e84d2680.pdf ER -