Albert K J, Myrick M L, Brown S B, James D L, Milanovich F P, Walt D R
Department of Chemistry, Tufts University, Medford, Massachusetts 02155, USA.
Environ Sci Technol. 2001 Aug 1;35(15):3193-200. doi: 10.1021/es010829t.
A field-deployable instrument has been developed to detect low-level 2,4-dinitrotoluene (2,4-DNT) vapors. The system is based on previously developed artificial nose technology and employs an array of sensory materials attached to the distal tips of an optical fiber bundle. Both semiselective and nonspecific, cross-reactive sensors were employed. Each sensor within the array responds differentially to vapor exposure so the array's fluorescence response patterns are unique for each analyte. The instrument is computationally "trained" to discriminate target response patterns from nontarget and background environments. This detection system has been applied to detect 2,4-DNT, an analyte commonly detected on the soil surface above buried 2,4,6-trinitrotoluene (TNT) land mines, in spiked soil and aqueous and ground samples. The system has been characterized and demonstrated the ability to detect 120 ppb 2,4-DNT vapor in blind (unknown) humidified samples during a supervised field test.
已开发出一种可现场部署的仪器，用于检测低浓度的2,4 - 二硝基甲苯（2,4 - DNT）蒸气。该系统基于先前开发的人工鼻技术，采用附着在光纤束远端的一系列传感材料。使用了半选择性和非特异性的交叉反应传感器。阵列中的每个传感器对蒸气暴露的响应各不相同，因此阵列的荧光响应模式对于每种分析物都是独特的。该仪器经过计算“训练”，以区分目标响应模式与非目标和背景环境。此检测系统已应用于检测2,4 - DNT，2,4 - DNT是在掩埋的2,4,6 - 三硝基甲苯（TNT）地雷上方土壤表面常见的一种分析物，可用于加标土壤以及水性和地面样品的检测。该系统已得到表征，并在一次监督现场测试中证明了能够在未知湿度的盲样中检测到120 ppb的2,4 - DNT蒸气。
