Chormey, Dotse SelaliAkkaya, ErhanErulas, Fatih AhmetBakirdere, Sezgin2024-12-242024-12-2420190026-36721436-5073https://doi.org/10.1007/s00604-019-3821-yhttps://hdl.handle.net/20.500.12604/5997Nanosized magnetic nanoparticles (MNPs) were utilized for the preconcentration of 12 analytes including pesticides, alkylphenols, hormones and bisphenol A prior to their determination by GC-MS. The extraction efficiency of the MNPs was enhanced by coating them with oleic acid and stearic acid. A binary system consisting of the two kinds of coated MNPs was optimized using a multivariate experimental design which evaluated main experimental variables and their interactions. Under optimized conditions, the following figures of merit are found: (a) Enrichment factors ranging from 64 to 345; (b) detection limits between 0.13 and 2.7 mu g L-1; and (c) recoveries from spiked underground well water and municipal wastewater between 90 and 109%. The closeness of the results to 100% validated the method and underpinned its trueness for quantitative determinations.eninfo:eu-repo/semantics/closedAccessPesticidesEndocrine disruptorsMultivariate optimizationMicroextractionOleic and stearic acid-coated magnetite nanoparticles for sonication-assisted binary micro-solid phase extraction of endocrine disrupting compounds, and their quantification by GC-MSArticle18612Q1WOS:000499469300004Q12-s2.0-850756782593177668610.1007/s00604-019-3821-y