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

Figure 8

Effect of the stirring rate. Extraction conditions: 300 μg·kg⁻¹ SAs mixtures 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; 10% TOPO in 1-octanol as an SLM; NaCl (4%, w/v); stirring rate: 200–1000 rpm; extraction time: 60 min; and n = 5.