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Rapid determination of ions by combined solid-phase extraction--diffuse reflectance spectroscopyWe introduce colorimetric solid-phase extraction (C-SPE) for the rapid determination of selected ions. This new technique links the exhaustive concentration of an analyte by SPE onto a membrane disk surface for quantitative measurement with a hand-held diffuse reflectance spectrometer. The concentration/measurement procedure is complete in approximately 1 min and can be performed almost anywhere. This method has been used to monitor iodine and iodide in spacecraft water in the 0.1-5.0 ppm range and silver(I) in the range of 5.0-1000 microg/l. Applications to the trace analysis of copper(II), nickel(II), iron(III) and chromium(VI) are described. Studies on the mechanism of extraction showed that impregnation of the disk with a surfactant as well as a complexing reagent results in uptake of additional water, which markedly improves the extraction efficiency.
Document ID
Document Type
Reprint (Version printed in journal)
Fritz, James S. (US Department of Energy, Iowa State University Department of Chemistry, Ames, IA 50011, United States)
Arena, Matteo P.
Steiner, Steven A.
Porter, Marc D.
Date Acquired
August 21, 2013
Publication Date
May 16, 2003
Publication Information
Publication: Journal of chromatography. A
Volume: 997
Issue: 1-2
Subject Category
Life Sciences (General)
Distribution Limits
NASA Program Advanced Human Support Technology
Non-NASA Center
NASA Discipline Life Sciences Technologies