期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 407, 期 29, 页码 8753-8764出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-015-9034-2
关键词
Ionic liquids; Double-salt ionic liquids; Ionic-liquid-based surfactants; Magnetic nanoparticles; Mixed hemimicelles; Dispersive solid-phase extraction
资金
- MINECO [MAT2013-43101-R, MAT2014-57465-R]
- Fundacion CajaCanarias [SPDs-AGUA05]
- University of La Laguna
- Chemical Measurement and Imaging Program at the National Science Foundation [CHE-1413199]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1602091] Funding Source: National Science Foundation
The use of mixed hemimicelles of ionic liquid (IL)-based surfactants in a magnetic-based micro-dispersive solid-phase extraction (m-mu dSPE) approach is described. Not only is the symmetric monocationic IL-based surfactant 1,3-didodecylimidazolium bromide (C(12)C(12)Im-Br) studied for first time in m-mu dSPE, but double-salt (DS) IL (DSIL)-based surfactants are also examined. Nine DSIL-based surfactants were formed by combination of C(12)C(12)Im-Br with other IL-based surfactants, including nonsymmetric monocationic and dicationic ILs combined at three different molar fractions. The analytical application was focused on the determination of a group of eight phenols, including bisphenol A, in water samples. The best results were obtained with the DSIL formed by C(12)C(12)Im-Br (molar fraction 0.5) and 1-hexadecyl-3-methylimidazolium bromide (C(16)MIm-Br), after proper optimization of the overall method in combination with high-performance liquid chromatography (HPLC) and diode-array detection (DAD). The optimum conditions for 100 mL of water samples require a small amount (10 mg) of Fe3O4 magnetic nanoparticles, a low content (5.0 mg of C(12)C(12)Im-Br and 3.9 mg of C(16)MIm-Br) of the selected DSIL, pH 11, a sonication time of 2.5 min, and an equilibration time of 5 min with the aid of NdFeB magnets, followed by elution of phenols, evaporation, and reconstitution with 0.5 mL of acetonitrile. The overall m-mu dSPE-HPLC-DAD method is characterized for limits of detection down to 1.3 mu g center dot L-1, intraday relative standard deviations lower than 13 % (n = 3), and interday relative standard deviations lower than 17 % (n = 9), with a spiking level of 15 mu g center dot L-1; with enrichment factors between 15.7 and 141, and average relative recoveries of 99.9 %.
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