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The effect of sample holder material on ion mobility spectrometry reproducibilityWhen a positive detection of a narcotic occurs during the search of a vessel, a decision has to be made whether further intensive search is warranted. This decision is based in part on the results of a second sample collected from the same area. Therefore, the reproducibility of both sampling and instrumental analysis is critical in terms of justifying an in depth search. As reported at the 2nd Annual IMS Conference in Quebec City, the U.S. Coast Guard has determined that when paper is utilized as the sample desorption medium for the Barringer IONSCAN, the analytical results using standard reference samples are reproducible. A study was conducted utilizing papers of varying pore sizes and comparing their performance as a desorption material relative to the standard Barringer 50 micron Teflon. Nominal pore sizes ranged from 30 microns down to 2 microns. Results indicate that there is some peak instability in the first two to three windows during the analysis. The severity of the instability was observed to increase as the pore size of the paper is decreased. However, the observed peak instability does not create a situation that results in a decreased reliability or reproducibility in the analytical result.
Document ID
19950026861
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jadamec, J. Richard (Coast Guard Research and Development Center Groton, CT, United States)
Su, Chih-Wu (Coast Guard Research and Development Center Groton, CT, United States)
Rigdon, Stephen (Analysis and Technology, Inc. New London, CT., United States)
Norwood, Lavan (Tectonic Technologies, Inc. Wethersfield, CT., United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1995
Publication Information
Publication: NASA. Johnson Space Center, Third International Workshop on Ion Mobility Spectrometry
Subject Category
Inorganic And Physical Chemistry
Accession Number
95N33282
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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