Hollow Fibre-Supported Liquid Membrane for the Determination of Sulfonamide Residues in Egg Samples

Figure 9

Effect of the extraction time. Extraction conditions: 300 μg·kg⁻¹ SAs mixture spiked in blank egg samples; hollow fibre length (4 cm); 5 mL of aqueous sample solution (pH 2.5); 6 μL of aqueous acceptor phase at pH 13; 1-octanol in (10% TOPO) as an SLM; NaCl (4%); stirring rate: 600 rpm; extraction time: 30–150 min; and n = 5.