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Related Experiment Videos

Rapid determination of ions by combined solid-phase extraction--diffuse reflectance spectroscopy.

James S Fritz1, Matteo P Arena, Steven A Steiner

  • 1Microanalytical Instrumentation Center, Ames Laboratory, US Department of Energy, Department of Chemistry, Iowa State University, Ames, IA 50011, USA. kniss@ameslab.gov

Journal of Chromatography. A
|July 2, 2003
PubMed
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A new colorimetric solid-phase extraction (C-SPE) method enables rapid, on-site ion determination. This technique uses a spectrometer for quick, accurate measurements of various ions in water samples.

Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Traditional ion determination methods can be time-consuming and require specialized laboratory equipment.
  • There is a need for rapid, portable analytical techniques for field monitoring of water quality.

Purpose of the Study:

  • To introduce and validate a novel colorimetric solid-phase extraction (C-SPE) technique for rapid ion determination.
  • To demonstrate the versatility of C-SPE for analyzing various ions in different concentration ranges.

Main Methods:

  • Developed a C-SPE method utilizing membrane disks for analyte concentration.
  • Employed a hand-held diffuse reflectance spectrometer for quantitative measurement.
  • Investigated the impact of surfactants and complexing reagents on extraction efficiency.
Keywords:
NASA Discipline Life Sciences TechnologiesNASA Program Advanced Human Support TechnologyNon-NASA Center

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Main Results:

  • Achieved rapid (approx. 1 min) concentration and measurement of ions.
  • Successfully monitored iodine and iodide in spacecraft water (0.1-5.0 ppm).
  • Quantified silver(I) (5.0-1000 µg/l) and demonstrated applications for Cu(II), Ni(II), Fe(III), and Cr(VI).
  • Optimized extraction by impregnating disks with surfactants and complexing reagents, enhancing water uptake and efficiency.

Conclusions:

  • C-SPE is a rapid, portable, and effective technique for on-site ion analysis.
  • The method offers broad applicability for monitoring various ions in diverse water matrices.
  • Further optimization of C-SPE can significantly improve extraction performance.