Paper Title
Magnetic Nanoparticles for Solid-Phase Microextraction: A Valuable Tool in the Analytical Laboratory

Abstract
Magnetic nanoparticles (MNPs) have proven to be suitable sorbents for the preconcentration of different analytes from a wide range of sample matrices in the analytical laboratory. The general procedure involves the dispersion of MNPs into the sample solution and, after adsorption of the analytes, the application of an external magnetic field to isolate the enriched MNPs, the supernatant being discarded. Finally, the target compounds are released of the magnetic sorbent with a small quantity of an adequate solvent to be analyzed using different analytical techniques such as mass spectrometry after a chromatographic separation or atomic spectrometry. Once the main parameters affecting the preconcentration procedure (type and amount of magnetic nanoparticles, amount of sample, adsorption and desorption times and desorption solvent nature and volume) are studied, reliable and sensitive analytical procedures result. This communication discusses some recent advances in this research line Keywords - Magnetic Nanoparticles, Chromatography, Atomic Spectrometry