|
چکیده
|
tIn this study, for the first time, a simple, inexpensive and sensitive method named emulsificationliquid–liquid microextraction based on deep eutectic solvent (ELLME-DES) was used for the extractionof benzene, toluene, ethylbenzene (BTE) and seven polycyclic aromatic hydrocarbons (PAHs) from watersamples. In a typical experiment, 100 L of DES (as water-miscible extraction solvent) was added to1.5 mL of sample solution containing target analytes. A homogeneous solution was formed immedi-ately. Injection of 100 L of THF (as emulsifier agent) into homogeneous solution provided a turbid state.After extraction, phase separation (aqueous phase/DES rich phase) was performed by centrifugation. DESrich phase was withdrawn by a micro-syringe and submitted to isocratic reverse-phase HPLC with UVdetection. Under optimum conditions obtained by response surface methodology (RSM) and desirabil-ity function (DF), the calibration graphs were linear in the concentration range from 10 to 200 g/L forbenzene, 10–400 g/L for toluene, 1–400 g/L for ethylbenzene, biphenyl, chrysene and fluorene, and0.1–400 g/L for anthracene, benzo[a]pyrene, phenanthrene and pyrene. The coefficients of determina-tion (r2) and limits of detection were 0.9924–0.9997 and 0.02–6.8 g/L, respectively. This procedure wassuccessfully applied to the determination of target analytes in spiked water samples. The relative meanrecoveries ranged from 93.1 to 103.3%.
|