Determination of Pyrethroids in Paris polyphylla Sample by High-Performance Liquid Chromatography Using Ultrasound-Assisted Magnetic Solid-Phase Extraction

Figure 7

Effect of desorption solution. Extraction conditions: sample volume, 50.0 mL spiked with 100 ng mL⁻¹ of four pyrethroids; pH, 7.0; ultrasonication time, 2 min; magnetic nanoparticles (MNPs), 60 mg.