Selectivity was verified by comparing the chromatograms of
standards dissolved in EtOH, standards extracted from the spiked
wastewater and extracts of wastewater. Linearity and range were
evaluated using calibration curves prepared in triplicate with a
set of six different standard concentrations of the spiked wastewater:
2; 4; 7; 10; 20; 30 ng mL1 for enantiomers of the NFLX and 4;
8; 14; 20; 40; 60 ng mL1 for enantiomers of the FLX. Calibration
curves were drawn by the injection of 20 lL of the reconstituted
500 lL extract dissolved in ethanol. LOD and LOQ were calculated
from spiked samples through the signal-to-noise (S/N) ratio of 3 for
LOD and 10 for LOQ.