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Optode for uranium(VI) determination in aqueous medium.

J M Joshi1, P N Pathak, A K Pandey

  • 1Chemical Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.

Talanta
|July 1, 2008
PubMed
Summary
This summary is machine-generated.

A new membrane optode using Br-PADAP chromophore enables rapid, visual detection of uranium(VI) in water. This method offers preconcentration and determination, showing potential for screening uranium in environmental and industrial samples.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Accurate determination of uranium(VI) in aqueous samples is crucial for environmental monitoring and industrial processes.
  • Conventional spectrophotometric methods can be time-consuming and require specialized equipment.
  • Development of rapid, field-deployable sensing technologies for uranium detection is needed.

Purpose of the Study:

  • To develop a novel colorimetric method for simultaneous preconcentration and determination of uranium(VI) anions.
  • To create a membrane optode based on a chromophore embedded in a cellulose triacetate matrix.
  • To evaluate the optode's performance for visual colorimetric screening of uranium(VI).

Main Methods:

  • A membrane optode was fabricated by incorporating the chromophore 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP) and tricaprylylmethyl ammonium chloride (Aliquat-336) into a plasticized cellulose triacetate matrix.
  • Uranium(VI) uptake was studied in a bicarbonate/carbonate medium at pH 7-8.
  • Optode composition and experimental parameters were optimized for response time, sensitivity, and selectivity.

Main Results:

  • The developed optode exhibited a distinct color change from yellow to magenta upon uranium(VI) sorption, facilitating visual detection.
  • The intensity of the magenta color showed proportionality to the uranium(VI) concentration, enabling quantitative analysis.
  • The optode demonstrated good analytical performance, including evaluation of interference, equilibration time, reusability, and detection limits, and was tested on a real industrial effluent sample.

Conclusions:

  • The membrane optode offers a simple, rapid, and effective colorimetric method for preconcentration and determination of uranium(VI).
  • The visual detection capability makes it suitable for on-site screening of uranium in aqueous samples.
  • This approach provides a viable alternative to conventional spectrophotometric methods for uranium analysis.