Low Density Ionic Liquid-Based Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction for the Preconcentration of Trace Aromatic Amines in Waters

Low density ionic liquid-based ultrasound-assisted dispersive liquid-liquid microextraction for the preconcentration of aromatic amines in river waters and wastewater before HPLC-UV analysis was studied. In the proposed method, the ionic liquid, trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl) phosphinate, was used as a low density extractant, and ultrasound was used as an efficient dispersing agent. After dispersion, the phases were separated by centrifugation. Next, the low density extractant phase floating on the surface was taken with a microsyringe and was dissolved in a small volume of methanol before chromatographic analysis. The limits of detection were 0.09 ng/mL for 4-toluidine, 0.12 ng/mL for 2,4-dichloroaniline and 0.07 ng/mL for 4-chloroaniline. The accuracy of this method was evaluated by preconcentration and determination of aromatic amines in wastewater and river waters with the recovery values in the range of 81.7-94.9% and precision of 2.8-6.0%.
Author(s): Justyna Werner [sup.1] Author Affiliations: (1) grid.6963.a, 0000 0001 0729 6922, Poznan University of Technology, Faculty of Chemical Technology, , 60-965, Poznan, Poland Main sources of aromatic amines occurrence [...]