Silica supported Fe3O4 magnetic nanoparticles for magnetic solid-phase extraction and magnetic in-tube solid-phase microextraction: application to organophosphorous compounds

Abstract

This work demonstrates the application of silica supported Fe3O4 nanoparticles as sorbent phase for magnetic solid-phase extraction (MSPE) and magnetic on-line in-tube solid-phase microextraction (Magnetic-IT-SPME) combined with capillary liquid chromatography-diode array detection (CapLC-DAD) to determine organophosphorous compounds (OPs) at trace level. In MSPE, magnetism is used as separation tool while in Magnetic-IT-SPME, the application of an external magnetic field gave rise to a significant improvement of the adsorption of OPs on the sorbent phase. Extraction efficiency, analysis time, reproducibility and sensitivity have been compared. This work showed that Magnetic-IT-SPME can be extended to OPs with successful results in terms of simplicity, speed, extraction efficiency and limit of detection. Finally, wastewater samples were analysed to determine OPs at nanograms per litre.

Recent advances of in-tube solid-phase microextraction

“…In-tube SPME-CapLC has been mostly used to analyze environmental samples. Organophosphorus compounds [27,28], triazines [29,30], lauralkonium chloride [31], chlorophyll [32] and sterols [33] have been successfully determined in water samples using in-tube SPME-CapLC-DAD (see Table 1). The same approach can be used in multiresidue analysis [7,8].…”

Advances in different configurations of solid-phase microextraction and their applications in food and environmental analysis

“…Silica-supported Fe 3 O 4 -NPs were applied as sorbent phase for MD-SPME combined with capillary LC-DAD to determine organophosphorus compounds at trace level [55,56]. A core-shell structure of Fe 3 O 4 /SiO 2 /TiO 2 composite was prepared by coating magnetite core particles with silica and titania layers.…”

Nanostructured biogel templated synthesis of Fe3O4 nanoparticles and its application for catalytic degradation of xylenol orange

“…alumina, silica and activated carbon) and macromolecular microspheres are commonly employed as the templates for the formation of Fe 3 O 4 nanoparticles. [17][18][19][20] In addition, surfactants, capping agents, and chelating agents are also widely applied to increase the stability and activity. [21][22][23] Hydrogels are three-dimensional polymeric networks containing a large portion of water.…”