Magnetic ionic liquids as non-conventional extraction solvents for the determination of polycyclic aromatic hydrocarbons

Journal Article

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Analytica Chimica Acta

Anal.Chim.Acta

31-Aug

934

106

113

Netherlands

1873-4324; 0003-2670

PMID: 27506350

eng

Journal Article; IM

10.1016/j.aca.2016.06.014 [doi]

Unknown(0)

27506350

This work describes the applicability of magnetic ionic liquids (MILs) in the analytical determination of a group 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, and their performance examined in a microextraction method for hydrophobic analytes. The magnet-assisted approach with these MILs was performed in combination with high performance liquid chromatography and fluorescence detection. The study of the extraction performance showed that MIL A was the most suitable solvent for the extraction of polycyclic aromatic hydrocarbons and under optimum conditions the fast extraction step required approximately 20 muL of MIL A for 10 mL of aqueous sample, 24 mmol L(-1) NaOH, high ionic strength content of NaCl (25% (w/v)), 500 muL 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 (the separation requires few seconds), two back-extraction steps for polycyclic aromatic hydrocarbons retained in the MIL droplet with n-hexane, evaporation and reconstitution with acetonitrile. The overall method presented limits of detection down to 5 ng L(-1), relative recoveries ranging from 91.5 to 119%, and inter-day reproducibility values (expressed as relative standard derivation) lower than 16.4% for a spiked level of 0.4 mug L(-1) (n = 9). The method was also applied for the analysis of real samples, including tap water, wastewater, and tea infusion.

Elsevier B.V

Trujillo-Rodriguez,M.J., Nacham,O., Clark,K.D., Pino,V., Anderson,J.L., Ayala,J.H., Afonso,A.M.

Departamento de Quimica (Area de Quimica Analitica), Universidad de La Laguna (ULL), La Laguna, Tenerife, 38206, Spain. Electronic address: mtrujill@ull.edu.es.; Department of Chemistry, Iowa State University, Ames, IA, 50011, USA. Electronic address: ona

20160615

http://vp9py7xf3h.search.serialssolutions.com/?charset=utf-8&pmid=27506350

2016