Field-Deployable Sniffer for 2,4-Dinitrotoluene Detection
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- 作者：Keith J. Albert ; M. L. Myrick ; Steve B. Brown ; Dale L. James ; Fred P. Milanovich ; and David R. Walt
- 刊名：Environmental Science & Technology
- 出版年：2001
- 出版时间：August 1, 2001
- 年：2001
- 卷：35
- 期：15
- 页码：3193 - 3200
- 全文大小：593K
- 年卷期：v.35,no.15(August 1, 2001)
- ISSN：1520-5851
文摘
A field-deployable instrument has been developed todetect low-level 2,4-dinitrotoluene (2,4-DNT) vapors. Thesystem is based on previously developed artificial nosetechnology and employs an array of sensory materialsattached to the distal tips of an optical fiber bundle. Bothsemiselective and nonspecific, cross-reactive sensorswere employed. Each sensor within the array respondsdifferentially to vapor exposure so the array's fluorescenceresponse patterns are unique for each analyte. Theinstrument is computationally "trained" to discriminatetarget response patterns from nontarget and backgroundenvironments. This detection system has been applied todetect 2,4-DNT, an analyte commonly detected on thesoil surface above buried 2,4,6-trinitrotoluene (TNT) landmines, in spiked soil and aqueous and ground samples. Thesystem has been characterized and demonstrated theability to detect 120 ppb 2,4-DNT vapor in blind (unknown)humidified samples during a supervised field test.