Analytes were desorbed by sonication for 5 min using 350 L acetonitrile (Fig. 1(b)), which served as the dispersive solvent in the next extraction (DLLME) step.
Analytes were desorbed by sonication for 5 min using350 L acetonitrile (Fig. 1(b)), which served as the dispersive solventin the next extraction (DLLME) step.