Enhanced detection of nitroaromatic vapors with a cryotrap and solute modulation through electron attachment reactions

Mark Gehrke; Shubhender Kapila; Paul K. Nam; Virgil I. Flanigan

doi:10.1117/12.324212

4 September 1998 Enhanced detection of nitroaromatic vapors with a cryotrap and solute modulation through electron attachment reactions

Mark Gehrke, Shubhender Kapila, Paul K. Nam, Virgil I. Flanigan

Author Affiliations +

Proceedings Volume 3392, Detection and Remediation Technologies for Mines and Minelike Targets III; (1998) https://doi.org/10.1117/12.324212
Event: Aerospace/Defense Sensing and Controls, 1998, Orlando, FL, United States

Abstract

An integrated approach for enhanced detection of nitroaromatic compounds in the vapor phase is being investigated. The approach involves the use of a very low volume cryoconcentrator with rapid desorbing capabilities. The concentrator desorber is coupled to solute modulated detection systems. Modulation of nitroaromatics via electron attachment reactions holds potential for nitroaromatics because of high electron affinity of these compounds. Under suitable conditions, i.e., low solute concentration and high electron population, these reactions occur at coulometric limits. The results show that the concentrator system permits rapid, quantitative enrichment of semivolatile nitroaromatics. Results of electron attachment reaction show that these reactions lead to disintegration of nitroaromatic radicals while the potentially interfering compounds such as polyhalogenated aromatics undergo hydrochlorination and yield distinctive products. These differences can be used for modulation of nitroaromatic compounds at low concentrations.

Citation Download Citation

Mark Gehrke, Shubhender Kapila, Paul K. Nam, and Virgil I. Flanigan "Enhanced detection of nitroaromatic vapors with a cryotrap and solute modulation through electron attachment reactions", Proc. SPIE 3392, Detection and Remediation Technologies for Mines and Minelike Targets III, (4 September 1998); https://doi.org/10.1117/12.324212

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