InertSep AL-N/C18/SAX/PSA is a four-layer-type solid phase extraction cartridge, from the top layer it packed with AL-N (100 mg), C18 (200 mg), and SAX (100 mg) and PSA (100 mg). The cartridge is small-packed volume and small reservoir size, suitable for rapid analysis. The main application field is simultaneous screening analysis of pesticide residues in agricultural crops. Only use acetonitrile solvent to easily operate.