Electric currents in m-EMEs of SPADNS using two different extraction units.
m-EME conditions: micropipette tip (Kartel Spa, Part No. 959); PFA tubing (Vici-Jour,
Part No. JR-T-4007), 1.0/1.6 mm ID/OD, and 40 mm long; acceptor, 1.0 mL DI water;
FLM, 1.0 mL 1-pentanol; donor, 15 mL SPADNS (20 mM) in DI water; extraction
voltage,
150 V. RSD values of electric currents
9.6% for micropipette tip and
8.3% for PFA tubing, n = 3.