Journal
TALANTA
Volume 175, Issue -, Pages 352-358Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2017.07.063
Keywords
Selenium; Speciation; Deep eutectic solvent; Ultrasound energy; Dispersive liquid liquid microextraction; Electrothermal atomic absorption spectrometry
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Funding
- Scientific and Technological Research Council of Turkey (Tubitak) [2216]
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A novel ultrasound-assisted liquid phase microextraction (UALPME) based on environmental friendly extractants, deep eutectic solvent (DES) was first time presented for speciation of selenium. In present study, five DES solvents of different composition was prepared and used as efficient extractive medium for hydrophobic chelate of Se(IV) with 3,3'-Diaminobenzidine (DAB). The total inorganic Se species were determined after pre-reduction of Se(VI) to Se(IV), prior to applying developed method. The concentration of Se(VI) was calculated by the difference of Se(IV) values and total selenium contents. The concentration of Se in DES rich phase was measured with electrothermal atomic absorption spectrometer (ETAAS). The effects of different parameters on extraction efficiency of study analyte, including pH, ligand concentration, type and volume of DES, sonication time, volumes tetrahydrofuran and aqueous samples were examined. At the optimum conditions, limit of detection and quantification, preconcentration factor, and relative standard deviation (RSD %) were determined as 4.61 ng L-1, 15.4 ng L-1, 50% and 4.1%, respectively. The accuracy of the presented method was confirmed by analysis of certified reference material and standard addition method for different water and ice tea samples. The developed method was effectively applied to real water and food samples.
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