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Evaluation of suspected interferents for TNT detection by ion mobility spectrometry.
MedLine Citation:
PMID:  18968239     Owner:  NLM     Status:  In-Data-Review    
The use of ion mobility spectrometry systems to detect explosives in high security situations creates a need to determine compounds that interfere and may compromise accurate detection. This is the first study to identify possible interfering air contaminants common in airport settings by IMS. Seventeen suspected contaminants from four major sources were investigated. Due to the ionization selectivity gained by employing chloride reactant ion chemistry, only 7 of the 17 compounds showed an IMS response. Of those seven compounds, only 4,6-dinitro-o-cresol (4,6DNOC) was found to have a similar mobility to 2,4,6-trinitrotoluene (TNT) with K(o) values of 1.55 and 1.50 cm(2) V(-1) s(-1), respectively. Although baseline resolution between TNT and 4,6DNOC was not achieved, the drift time for TNT was still easily identified. Alkyl-nitrated phenols, due to acidic fog, responded the strongest in the IMS. The effect of contamination on TNT sensitivity was investigated. Charge competition between TNT and 2,4-dinitrophenol (2,4DNP) was found to occur and to effect TNT sensitivity.
L M Matz; P S Tornatore; H H Hill
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Talanta     Volume:  54     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2001 Mar 
Date Detail:
Created Date:  2008-10-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  171-9     Citation Subset:  -    
Department of Chemistry, Washington State University, Pullman, WA 99164-4630, USA.
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