Selective sampling with direct ion mobility spectrometric detection for explosives analysis |
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Authors: | Scott D Harvey Robert G Ewing Melanie J Waltman |
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Institution: | (1) National Security Directorate, Pacific Northwest National Laboratory, MSIN P7-07, Richland, WA 99352, USA;(2) New Mexico Tech, Socorro, NM 87801, USA |
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Abstract: | This study investigates the potential and limitations of a field-deployable analytical approach that involves selective capture
of explosive materials with direct analysis by ion mobility spectrometry (IMS). Selective capture of explosives was performed
on deactivated quartz fiber filters impregnated with metal β-diketonate polymers. These Lewis acidic polymers selectively
interact with Lewis base analytes such as explosives. The filters were directly inserted into an IMS instrument for analysis.
The uptake kinetics of 2,4,6-trinitrotoluene (TNT) from a saturated atmosphere were characterized, and based on these studies,
passive equilibrium sampling was applied to estimate the TNT concentration within an ammunition magazine that contained bulk
TNT. Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) uptake from a saturated environment also was examined over a one-month
period. Each incremental sampling period showed increasing quantities of RDX culminating with collection of approximately
5 ng of RDX on the filter at the end of one month. This is the first time that gas-phase uptake of RDX has been demonstrated. |
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