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Continuous Liquid-Liquid Extraction of Medium-Chain Fatty Acids from Fermentation Broth Using Hollow-Fiber Membranes
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Dispersive liquid-liquid microextraction using extraction solvent lighter than water.

Mir Ali Farajzadeh1, Seyed Esmaeil Seyedi, Mohammad Safi Shalamzari

  • 1Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran. mafarajzadeh@yahoo

Journal of Separation Science
|September 12, 2009
PubMed
Summary

A new dispersive liquid-liquid microextraction method efficiently extracts organophosphorus pesticides (OPPs) from water. This technique offers high enrichment factors and recoveries, improving upon existing methods for OPP analysis.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Separation Science

Background:

  • Organophosphorus pesticides (OPPs) are widely used, necessitating sensitive detection methods in water.
  • Existing preconcentration techniques for OPPs can be time-consuming or less efficient.
  • Development of novel microextraction methods is crucial for environmental monitoring.

Purpose of the Study:

  • To introduce a novel dispersive liquid-liquid microextraction (DLLME) method for OPPs.
  • To preconcentrate three model OPPs from aqueous samples.
  • To optimize DLLME parameters for enhanced extraction efficiency.

Main Methods:

  • Employed a DLLME technique using cyclohexane as the extraction solvent and acetone as the disperser.
  • Rapid injection of solvent mixture into aqueous samples to form a cloudy solution for OPP extraction.
  • Separation and detection of OPPs using gas chromatography (GC) with flame ionization detector (FID) or mass spectrometry (MS).

Main Results:

  • Achieved high enrichment factors (EFs) ranging from 100 to 150.
  • Obtained extraction recoveries between 68% and 105%, surpassing published methods.
  • Demonstrated wide linear ranges and low limits of detection (LODs) for OPPs.

Conclusions:

  • The proposed DLLME method is effective for the preconcentration of OPPs from water samples.
  • The method offers significant advantages in terms of efficiency and sensitivity compared to existing techniques.
  • This approach provides a valuable tool for the trace analysis of OPPs in environmental monitoring.