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Application of Colorimetric Solid Phase Extraction (C-SPE) to Monitoring Nickel(II) and Lead(II) in Spacecraft Water SuppliesArchived water samples collected on the International Space Station (ISS) and returned to Earth for analysis have, in a few instances, contained trace levels of heavy metals. Building on our previous advances using Colorimetric Solid Phase Extraction (C-SPE) as a biocide monitoring technique, we are devising methods for the low level monitoring of nickel(II), lead(II) and other heavy metals. C-SPE is a sorption-spectrophotometric platform based on the extraction of analytes onto a membrane impregnated with a colorimetric reagent that are then quantified on the surface of the membrane using a diffuse reflectance spectrophotometer. Along these lines, we have determined nickel(II) via complexation with dimethylglyoxime (DMG) and begun to examine the analysis of lead(II) by its reaction with 2,5- dimercapto-1,3,4-thiadiazole (DMTD) and 4-(2- pyridylazo)-resorcinol (PAR). These developments are also extending a new variant of C-SPE in which immobilized reagents are being incorporated into this methodology in order to optimize sample reaction conditions and to introduce the colorimetric reagent. This paper describes the status of our development of these two new methods.
Document ID
20050217258
Acquisition Source
Johnson Space Center
Document Type
Preprint (Draft being sent to journal)
Authors
Diaz, Neil C. (Ames Lab. IA, United States)
Gazda, Daniel B. (Ames Lab. IA, United States)
Fritz, James S. (Ames Lab. IA, United States)
Porter, Marc D. (Ames Lab. IA, United States)
Rutz, Jeff (Wyle Labs., Inc. Houston, TX, United States)
Mudgett, Paul (Wyle Labs., Inc. Houston, TX, United States)
Schultz, John (Wyle Labs., Inc. Houston, TX, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Subject Category
Space Processing
Meeting Information
Meeting: 34th International Conference on Environmental Systems
Location: Colorado Springs, CO
Country: United States
Start Date: July 19, 2004
End Date: July 22, 2004
Funding Number(s)
CONTRACT_GRANT: W-7405-eng-82
CONTRACT_GRANT: NAG9-1191
CONTRACT_GRANT: NAS9-02078
CONTRACT_GRANT: NAG9-1510
Distribution Limits
Public
Copyright
Public Use Permitted.

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