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Author Spotlight: Optimizing Hollow-Fiber Membranes for Continuous Liquid-Liquid Extraction of Medium-Chain Fatty Acids
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Dissolved carbon dioxide flotation: an effective way for phase separation in emulsification microextraction method.

Saeideh Molaei1, Abolfazl Saleh2, Vanik Ghoulipour1

  • 1Faculty of Chemistry, Kharazmi University, 43 Mofateh Ave., Tehran 1571914911, Iran.

Journal of Chromatography. A
|March 3, 2015
PubMed
Summary

A new method, dissolved carbon dioxide flotation after emulsification microextraction (DCF-EME), efficiently extracts organochlorine pesticides from seawater. This technique offers sensitive detection for environmental monitoring.

Keywords:
Dissolved carbon dioxide flotationEmulsification microextractionLow density organic solventsOrganochlorine pesticidesSeawater

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry

Background:

  • Organochlorine pesticides (OCPs) are persistent environmental pollutants.
  • Accurate determination of OCPs in complex matrices like seawater is crucial for environmental safety.

Purpose of the Study:

  • To develop a novel, efficient method for the preconcentration and determination of OCPs in seawater.
  • To introduce the dissolved carbon dioxide flotation after emulsification microextraction (DCF-EME) technique coupled with gas chromatography-electron capture detection (GC-ECD).

Main Methods:

  • The DCF-EME method utilizes in situ generated carbon dioxide bubbles and ultrasound to facilitate phase separation.
  • A low-density organic solvent is rapidly collected at the surface for easy retrieval.
  • Analysis is performed using gas chromatography-electron capture detection (GC-ECD).

Main Results:

  • The method achieved low limits of detection (2.6-9.2 ng L(-1)) for six OCPs.
  • High preconcentration factors ranging from 271 to 307 were obtained.
  • The technique was successfully applied to analyze Caspian seawater samples.

Conclusions:

  • The developed DCF-EME-GC-ECD method is a sensitive and efficient technique for OCP determination in seawater.
  • This method offers a valuable tool for environmental monitoring and analysis of trace organic pollutants.