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

Figure 7

Length of hollow fibre (acceptor volume) and volume of sample solution. Extraction conditions: 300 μg·kg⁻¹ SAs mixture spiked in blank egg samples; hollow fibre length (4–8 cm); volume of aqueous sample solution (pH 2.5) from 5–10 mL; 6–12 μL of aqueous acceptor phase at pH 13; 10% TOPO in 1-octanol as an SLM; NaCl (4%); stirring rate: 400 rpm; extraction time: 60 min; and n = 5.