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Faster dispersive liquid-liquid microextraction methods using magnetic ionic liquids as solvents.

Honglian Yu1, Josias Merib2, Jared L Anderson1

  • 1Department of Chemistry, Iowa State University, Ames, IA 50011, USA.

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|August 13, 2016
PubMed
Summary

Three novel magnetic ionic liquids (MILs) were developed for efficient extraction of various pollutants. The trihexyltetradecylphosphonium tetrachloromanganate(II) ([P6,6,6,14(+)]2[MnCl4(2-)]) MIL showed superior performance in liquid chromatography analysis.

Keywords:
Dispersive liquid-liquid microextractionHigh-performance liquid chromatographyInsecticidesMagnetic ionic liquidsPharmaceuticals

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Development of efficient extraction solvents is crucial for environmental monitoring and analysis.
  • Magnetic ionic liquids (MILs) offer unique properties like magnetic susceptibility and hydrophobicity for advanced separation techniques.
  • Tetrachloromanganate(II) ([MnCl4(2-)]) anion-based MILs have not been extensively explored for complex environmental sample matrices.

Purpose of the Study:

  • To synthesize and characterize three hydrophobic MILs containing the tetrachloromanganate(II) anion.
  • To evaluate the efficacy of these MILs as extraction solvents in dispersive liquid-liquid microextraction (DLLME) coupled with HPLC for analyzing diverse organic contaminants.
  • To optimize DLLME parameters for maximizing extraction efficiency and to assess the performance of the developed method in real water samples.

Main Methods:

  • Synthesis of three MILs: aliquat tetrachloromanganate(II) ([Aliquat(+)]2[MnCl4(2-)]), methyltrioctylammonium [MnCl4(2-)] ([N1,8,8,8(+)]2[MnCl4(2-)]), and trihexyltetradecylphosphonium [MnCl4(2-)] ([P6,6,6,14(+)]2[MnCl4(2-)]).
  • Application of MILs as extraction solvents in DLLME coupled to reversed-phase HPLC with UV detection.
  • Systematic optimization of DLLME parameters including disperser solvent type and volume, MIL mass, extraction time, sample pH, and salt concentration.

Main Results:

  • The [P6,6,6,14(+)]2[MnCl4(2-)] MIL demonstrated the highest extraction efficiencies for most target analytes, including pharmaceutical drugs, phenolics, insecticides, and polycyclic aromatic hydrocarbons.
  • The method achieved good linearity with correlation coefficients (R) ranging from 0.997 to 0.999.
  • Low limits of detection (LODs) from 0.25 to 1.00 μg L⁻¹ were obtained, with relative recoveries generally between 42.9% and 114.7% in lake and river water samples.

Conclusions:

  • Hydrophobic tetrachloromanganate(II)-based MILs, particularly [P6,6,6,14(+)]2[MnCl4(2-)], are effective extraction solvents for DLLME-HPLC analysis of organic pollutants.
  • The developed DLLME-MIL-HPLC method offers good sensitivity, linearity, and applicability to real environmental water samples.
  • MILs provide a promising alternative to conventional extraction solvents, combining ease of separation with efficient analyte recovery.