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Magnetic Materials in Separation Science Barrado Esteban, Enrique Rodríguez Ávila, José Ángel Sample pretreatment is one of the most important steps in chemical analysis. Extensive clean-up procedures are normally required to remove matrix components which may interfere in the analysis. Some common strategies to these steps are based on the liquid–liquid extraction or solid phase extraction (SPE) techniques, in which the separation occurs by the analyte partition coefficient between the sample solution phase and the solid sorbent. SPE has several merits such as lower cost, higher enrichment factor and less consumption of organic solvents. 2019-10-24T10:51:09Z 2019-10-24T10:51:09Z 2019-10-24T10:51:09Z 2019 info:eu-repo/semantics/bookPart Extraction: Magnetic Materials in Separation Science ENCYCLOPEDIA OF ANALYTICAL SCIENCE 3rd Edition. Vol 3. 2019, 63-66 Book: CHEMISTRY MOLECULAR SCIENCES AND CHEMICAL ENGINEERING 9780081019832 http://uvadoc.uva.es/handle/10324/38726 63 66 ENCYCLOPEDIA OF ANALYTICAL SCIENCE eng https://www.sciencedirect.com/science/article/pii/S0149639503800107 info:eu-repo/semantics/restrictedAccess Elsevier Elsevier