Analytical and Bioanalytical Chemistry

, Volume 407, Issue 29, pp 8753–8764 | Cite as

Double salts of ionic-liquid-based surfactants in microextraction: application of their mixed hemimicelles as novel sorbents in magnetic-assisted micro-dispersive solid-phase extraction for the determination of phenols

Research Paper

Abstract

The use of mixed hemimicelles of ionic liquid (IL)-based surfactants in a magnetic-based micro-dispersive solid-phase extraction (m-μdSPE) approach is described. Not only is the symmetric monocationic IL-based surfactant 1,3-didodecylimidazolium bromide (C12C12Im-Br) studied for first time in m-μdSPE, but double-salt (DS) IL (DSIL)-based surfactants are also examined. Nine DSIL-based surfactants were formed by combination of C12C12Im-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 C12C12Im-Br (molar fraction 0.5) and 1-hexadecyl-3-methylimidazolium bromide (C16MIm-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 C12C12Im-Br and 3.9 mg of C16MIm-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-μdSPE–HPLC–DAD method is characterized for limits of detection down to 1.3 μg · 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 μg · L-1; with enrichment factors between 15.7 and 141, and average relative recoveries of 99.9 %.

Keywords

Ionic liquids Double-salt ionic liquids Ionic-liquid-based surfactants Magnetic nanoparticles Mixed hemimicelles Dispersive solid-phase extraction 

Supplementary material

216_2015_9034_MOESM1_ESM.pdf (1.4 mb)
ESM 1(PDF 1451 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • María J. Trujillo-Rodríguez
    • 1
  • Verónica Pino
    • 1
  • Jared L. Anderson
    • 2
  • Juan H. Ayala
    • 1
  • Ana M. Afonso
    • 1
  1. 1.Área de Química Analítica, Departamento de QuímicaUniversidad de La LagunaLa Laguna (Tenerife)Spain
  2. 2.Department of ChemistryIowa State UniversityAmesUSA

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