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ATR-FT-IR membrane-based sensor for integrated microliquid-liquid extraction and detection.

Rafael Lucena1, Soledad Cárdenas, Mercedes Gallego

  • 1Department of Analytical Chemistry, Marie Curie Building (Annex), Campus de Rabanales, University of Córdoba, Spain.

Analytical Chemistry
|November 16, 2005
PubMed
Summary

A new membrane sensor using attenuated total reflection Fourier transform infrared (ATR-FT-IR) spectroscopy enables continuous on-line liquid-liquid extraction. This sensor efficiently detects and quantifies analytes like Triton X100 in water without cell disassembly.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Sensor Technology

Background:

  • Traditional analytical methods for detecting analytes in aqueous samples can be time-consuming and require complex sample preparation.
  • Microliquid-liquid extraction (µLLE) offers a more efficient approach for analyte preconcentration but often involves manual operation and cell disassembly.
  • Fourier transform infrared (FT-IR) spectroscopy is a powerful technique for molecular identification but requires effective sample presentation for aqueous matrices.

Purpose of the Study:

  • To develop a novel, straightforward membrane-based sensor for on-line microliquid-liquid extraction coupled with attenuated total reflection Fourier transform infrared (ATR-FT-IR) spectroscopy.
  • To demonstrate the continuous generation and regeneration of an organic solvent layer (OSL) for analyte enrichment without cell opening.
  • To evaluate the analytical performance for the detection and quantitation of Triton X100 in water samples.

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Main Methods:

  • Development of a flow cell integrating a commercial hydrophobic membrane for phase separation.
  • Utilization of a sequential injection manifold for automated on-line µLLE and OSL deposition/regeneration on the ATR surface.
  • ATR-FT-IR spectroscopy for real-time monitoring of analytes extracted into the OSL, avoiding water absorption bands.

Main Results:

  • The developed sensor system successfully performed on-line µLLE and analyte enrichment into the OSL.
  • Continuous OSL creation and regeneration were achieved, enhancing operational simplicity and reducing analysis time.
  • The system demonstrated effective exclusion of water absorption bands, improving spectral clarity for analyte detection.
  • Analytical performance was established for Triton X100 detection and quantitation in aqueous samples.

Conclusions:

  • The novel membrane-based ATR-FT-IR sensor provides a versatile and efficient platform for on-line analyte extraction and detection in water.
  • The automated sequential injection manifold facilitates continuous operation, making the system user-friendly and suitable for various organic solvents.
  • This approach offers a significant advancement for the analysis of trace contaminants in environmental and industrial water monitoring.