Fig. 4From: Ultrasound-assisted emulsification microextraction and preconcentration of trace amounts of silver ions as a cyclam complexEffect of time of extraction on USAEME of silver ions. Conditions: sample volume 5.0 mL; sample concentration 0.5 μg mL−1; extraction solvent volume (CHCl3) 200 μL; picric acid concentration 6 × 10−3 MBack to article page