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Reversible Hydrophobic Deep Eutectic Solvent-Based Uranyl-Sensing Optode Film in Aqueous Streams: Color

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A novel hydrophobic deep eutectic solvent (HDES)-based optode efficiently preconcentrates and determines uranyl ions (UO22+) in water. This sensor offers high selectivity and a low detection limit for uranium analysis in various aqueous samples.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Accurate determination of uranyl ions (UO22+) in aqueous media is crucial for environmental monitoring and nuclear safety.
  • Existing methods for UO22+ detection often require complex sample preparation and lack selectivity.
  • Development of sensitive and selective sensors for UO22+ preconcentration and determination is an ongoing research area.

Purpose of the Study:

  • To design and characterize a hydrophobic deep eutectic solvent (HDES)-based optode for UO22+ preconcentration and determination.
  • To evaluate the optode's performance using spectroscopic techniques like energy-dispersive X-ray fluorescence (EDXRF) and colorimetric analysis.
  • To assess the optode's selectivity and applicability in real-world samples, such as seawater.

Main Methods:

  • Fabrication of the optode by incorporating HDES, tri-(2-ethylhexyl) phosphate, and Br-PADAP into a cellulose triacetate matrix.
  • Characterization of the optode using various techniques to elucidate the roles of HDES and other components.
  • Uptake studies to determine optimal conditions (e.g., pH) and sorption behavior (adsorption isotherm).
  • Analysis of UO22+ using EDXRF and colorimetric methods with established linear dynamic ranges and limits of detection.
  • Application of the optode for direct UO22+ determination in seawater samples.

Main Results:

  • The HDES-based optode effectively preconcentrates UO22+ from aqueous solutions at an optimal pH of 3.
  • The optode demonstrated a wide linear dynamic range for uranium analysis using EDXRF (0.021 × 10-3–2.1 × 10-3 Mol L-1) and colorimetric analysis (0.84 × 10-6–84 × 10-6 Mol L-1).
  • A low limit of detection (0.084 × 10-6 Mol L-1) was achieved by colorimetric analysis.
  • The optode showed excellent selectivity for UO22+ over other cations, including Sr2+ and Cs+.
  • Direct analysis of UO22+ in seawater yielded a concentration of 1.30 ± 0.06 × 10-8 Mol L-1.

Conclusions:

  • The developed HDES-based optode is a promising tool for the selective and sensitive preconcentration and determination of UO22+ in aqueous media.
  • The optode offers advantages over existing optical sensors in terms of pH, equilibration time, reusability, and detection limit.
  • This method provides a simplified approach for analyzing UO22+ in complex matrices like seawater without prior separation.
  • The findings contribute to the advancement of sensor technology for environmental monitoring and nuclear waste management.