Solvent-assisted dispersive liquid-solid phase extraction of organophosphorus pesticides using a polypyrrole thin film-coated porous composite magnetic sorbent prior to their determination with GC-MS/MS.

A porous composite magnetic sorbent was developed and used as a solid phase for the solvent-assisted preconcentration of organophosphorus pesticides. The hierarchical porous composite sorbent was composed of polypyrrole thin film coated on the surface of porous alginate beads with embedded magnetite nanoparticles. The pores in the alginate hydrogel beads were produced by carbon dioxide bubbles from the reaction of incorporated calcium carbonate with hydrochloric acid.

Hierarchical porous nanostructured polypyrrole-coated hydrogel beads containing reduced graphene oxide and magnetite nanoparticles for extraction of phthalates in bottled drinks.

A hierarchically porous polypyrrole-coated nanostructured composite of reduced graphene oxide and magnetite nanoparticles (PPy-rGOx-FeO) incorporated into alginate hydrogel microspheres was synthesized and applied as a magnetic solid phase extraction adsorbent. The double network porous nanostructure of the composite hydrogel was created by CO produced from the reaction of hydrochloric acid with the CaCO in the hydrogel. The developed hydrogel microsphere was characterized and evaluated for the extraction and enrichment of phthalates.