محبوبه شیرانی

In recent years, the usage of magnetic sorbents in sample preparation and contaminants 23 removal techniques has received considerable attention as they can be easily recovered using an 24 external magnetic field. This ability reduces sample treatment time and simplifies the procedure. 25 In this review, the most recent and outstanding applications (2017-2021) of magnetic sorbents 26 for preconcentration and removal purposes is reviewed and discussed. This review firstly, 27 discusses preparation, advantages, limitations and possible interactions of different types of 28 magnetic sorbents briefly (nanoparticles, nanocomposites, sponges, foams, beads and hydrogels) 29 and also views on how to choose the appropriate sorbent based on the intended application. 30 Secondly, the role of magnetic sorbents in the common sample preparation techniques such as 31 solid phase extraction, solid phase microextraction, stir bar sorptive extraction and liquid phase 32 microextraction are also investigated and discussed. In conclusion, remarkable features and 33 future trends are commented