RT info:eu-repo/semantics/article
T1 In situ formation of hydrophobic magnetic ionic liquids for dispersive liquid-liquid microextraction
A1 Trujillo Rodríguez, María José
A1 Anderson, Jared L.
K1 Magnetic ionic liquids
K1 In situ dispersive liquid-liquid
microextraction
K1 Magnetic separation
K1 High performance liquid chromatography
K1 Organic pollutants
AB A new class of magnetic ionic liquid (MIL) containing paramagnetic cations has been applied for in situdispersive liquid-liquid microextraction in the determination of both polar and non-polar pollutants,including ultraviolet filters, polycyclic aromatic hydrocarbons, alkylphenols, a plasticizer and a preservative in aqueous samples. The MILs were based on cations containing Ni(II) metal centers coordinatedwith four N-alkylimidazole ligands and chloride anions. The MILs were capable of undergoing in situmetathesis reaction with the bis[(trifluoromethyl)sulfonyl]imide ([NTf2−]) anion during the microextraction procedure, generating a water-immiscible extraction solvent containing the preconcentratedanalytes. The MIL was then isolated by magnetic separation, followed by direct analysis using reversedphase high performance liquid chromatography with diode array detection. Among all of the studiedMILs, those containing the N-butylimidazole and N-benzylimidazole ligands ([Ni(C4IM)42+]2[Cl-] and[Ni(BeIM)42+]2[Cl-], respectively) exhibited the best extraction performance. The method under optimumconditions required 5 mL of sample at pH 3, 20 mg of [Ni(C4IM)42+]2[Cl-] or 30 mg of [Ni(BeIM)42+]2[Cl-],300 L of acetone or acetonitrile as dispersive solvent (depending on the MIL), a 1:2 M ratio of MIL to[NTf2−], and 3 min of vortex. The developed method achieved higher extraction efficiency comparedto the conventional MIL-dispersive liquid-liquid microextraction mode, with extraction efficiencies of46.8–88.6% and 65.4–97.0% for the [Ni(C4IM)42+]2[Cl-] and the [Ni(BeIM)42+]2[Cl-] MILs (at a spiked levelof 81 g L-1), respectively, limits of detection down to 5.2 g L-1, and inter-day relative standard deviationlower than 16%.
SN 1873-3778
YR 2019
FD 2019
LK http://riull.ull.es/xmlui/handle/915/36151
UL http://riull.ull.es/xmlui/handle/915/36151
LA en
NO Journal of Chromatography A10.1016/j.chroma.2018.12.032
DS Repositorio institucional de la Universidad de La Laguna
RD 27-nov-2024