Chromatograms of direct injection of standards at concentration level of
1.00 mg L1 (A), apple sample (B) and spiked apple sample at concentration level of
70.0 mg kg1 for imidacloprid and diazinon (C) obtained by using SDLLME-SFO combined
HPLC-UV. Conditions: sonication time, 20 min; type of extraction solvent in
sonication stage and its volume, acetone, 5 mL, respectively; sample amount, 1.00 gr;
extraction solvent in DLLME stage and its volume, 1-undecanol, 30 mL, respectively;
volume of disperser solvent (acetone), 1000 mL; sedimented phase volume, 25 ± 1 mL;
room temperature.