“…Many materials, such as silica-based (C2, C8, C18) sorbents, [13][14][15] strong cation exchanger, 14 carboxyl purified multi-walled carbon nanotubes, 17 and polystyrene, 18,19 are used as the sorbent in MEPS. Begheri et al have applied a polyaniline nanowire network, 20 and a polydiphenylamine nanocomposite, 21 as the sorbent in a packed syringe for the preconcentration and extraction of OPPs.…”