Fig. 3. Effect of the surfactant concentration on the extraction of zinc from edible oil samples by EIEB procedure. Conditions: sample volume, 4 mL; HNO3 concentration, 10% (w/v); equilibrium temperature, 80 C; equilibrium time in 30– 120 min.
Fig. 3. Effect of the surfactant concentration on the extraction of zinc from edible oil samples by EIEB procedure. Conditions: sample volume, 4 mL; HNO3 concentration, 10% (w/v); equilibrium temperature, 80 C; equilibrium time in 30– 120 min.