RT info:eu-repo/semantics/article
T1 Magnetic ionic liquids as non-conventional extraction solvents for the determination of polycyclic aromatic hydrocarbons
A1 Trujillo Rodríguez, María José
A1 Nacham, Omprakash
A1 Clark, Kevin D.
A1 Pino, Veronica
A1 Anderson, Jared L.
A1 Ayala, Juan H.
A1 Afonso, Ana M.
A2 Química
A2 MAT4LL
Materials for chemical analysis 
(https://portalciencia.ull.es/grupos/6582/detalle)
K1 Ionic liquids
K1 Magnetic ionic liquids
K1 Magnetic-assisted microextraction
K1 Polycyclic aromatic hydrocarbons
K1 High-performance liquid chromatography
AB This work describes the applicability of magnetic ionic liquids (MILs) in the analytical determination of agroup of heavy polycyclic aromatic hydrocarbons. Three different MILs, namely, benzyltrioctylammonium bromotrichloroferrate (III) (MIL A), methoxybenzyltrioctylammonium bromotrichloroferrate (III) (MIL B), and 1,12-di(3-benzylbenzimidazolium) dodecane bis[(trifluoromethyl)sulfonyl)]imide bromotrichloroferrate (III) (MIL C), were designed to exhibit hydrophobic properties, andtheir performance examined in a microextraction method for hydrophobic analytes. The magnet-assistedapproach with these MILs was performed in combination with high performance liquid chromatographyand fluorescence detection. The study of the extraction performance showed that MIL A was the mostsuitable solvent for the extraction of polycyclic aromatic hydrocarbons and under optimum conditionsthe fast extraction step required ~20 mL of MIL A for 10 mL of aqueous sample, 24 mmol L1 NaOH, highionic strength content of NaCl (25% (w/v)), 500 mL of acetone as dispersive solvent, and 5 min of vortex.The desorption step required the aid of an external magnetic field with a strong NdFeB magnet (theseparation requires few seconds), two back-extraction steps for polycyclic aromatic hydrocarbonsretained in the MIL droplet with n-hexane, evaporation and reconstitution with acetonitrile. The overallmethod presented limits of detection down to 5 ng L1, relative recoveries ranging from 91.5 to 119%, andinter-day reproducibility values (expressed as relative standard derivation) lower than 16.4% for a spiked level of 0.4 mg L1 (n ¼ 9). The method was also applied for the analysis of real samples, including tapwater, wastewater, and tea infusion
YR 2016
FD 2016
LK http://riull.ull.es/xmlui/handle/915/36181
UL http://riull.ull.es/xmlui/handle/915/36181
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 19-nov-2024