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

Figure 3

Evaluation of modifier. 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 4); 6 μL of aqueous acceptor phase (pH 12); 0–13% TOPO in 1-octanol as an SLM; stirring rate: 400 rpm; extraction time: 60 min; and n = 5.