Progresses in Magnetic Enrichment Techniques Based on Ionic Liquids and Their Applications in Analytical Chemistry

KeyWord:ionic liquids  magnetic solid phase extraction  pretreatment technique  environmental analysis  review

Abstract:

      Magnetic solid phase extraction is a kind of new sample pretreatment technique based on magnetic materials.It is currently a hot research in sample pretreatment field£¬and the study on magnetic adsorbent material is the key to this technique.The ionic liquids are a kind of liquid and organic salts composed of organic cations and organic or inorganic anions.Due to their low volatility£¬chemical and thermal stability£¬and good dissoluvability toward organics and inorganics£¬ionic liquids have been developed as a new adsorbent material for the preconcentration of organic pollutants and heavy metal ions in aqueous samples.However£¬the research on ionic liquids application in magnetic solid phase extraction is still in early stages.This paper summarizes the types of ionic liquids used in the magnetic enrichment techniques£¬and the present magnetic enrichment techniques based on ionic liquids into three categories£¬namely£¬the magnetic solid phase extraction based on ionic liquids functioned magnetic nanoparticles£¬the mixed hemimicelle magnetic solid phase extraction based on ionic liquids and the dual magnetic microextraction based on ionic liquids.The application of magnetic enrichment techniques based on ionic liquids in environmental£¬food and biological sample pretreatment are also reviewed.Subsequently£¬the principles that should be taken into consideration are briefly summarized when the magnetic enrichment techniques based on ionic liquids according to the analytes are selected.In the end£¬the future development direction of the magnetic enrichment techniques based on ionic liquids is outlooked.