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Field ion spectrometry: a new technology for cocaine and heroin detection

机译：场离子光谱：可卡因和海洛因检测的新技术

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Abstract: Field ion spectrometry, also known as transverse field compensation ion mobility spectrometry, is a new technique for trace gas analysis that can be applied to the detection of cocaine and heroin. Its principle is based on filtering ion species according to the functional dependence of their mobilities with electric field strength. Field ion spectrometry eliminates the gating electrodes needed in conventional IMS to pulse ions into the spectrometer; instead, ions are injected in to the spectrometer and reach the detector continuously, resulting in improved sensitivity. The technique enables analyses that are difficult with conventional constant field strength ion mobility spectrometers. We have shown that a filed ion spectrometer can selectively detect the vapors from cocaine and heroin emitted from both their base and hydrochloride forms. The estimated volumetric limits of detection are in the low pptv range, based on testing with standardized drug vapor generation systems. The spectrometer can detect cocaine base in the vapor phase, at concentrations well below its estimated 100 pptv vapor pressure equivalent at 20 degrees C. This paper describes the underlying principles of field ion spectrometry in relation to narcotic drug detection, and recent results obtained for cocaine and heroin. The work has been sponsored in part by the United States Advanced Research Projects Agency under contract DAAB10-95C-0004, for the DOD Counterdrug Technology Development Program. !10
机译：摘要：场离子光谱法，又称横向场补偿离子迁移光谱法，是一种痕量气体分析的新技术，可用于可卡因和海洛因的检测。它的原理是根据离子种类的迁移率与电场强度之间的函数关系来过滤离子种类。场离子光谱法消除了常规IMS中将离子脉冲进入光谱仪所需的门控电极。而是将离子注入光谱仪，并连续到达检测器，从而提高了灵敏度。该技术可进行常规恒定场强离子迁移谱仪难以进行的分析。我们已经表明，场离子光谱仪可以选择性地检测从可卡因和海洛因的碱和盐酸盐形式释放的蒸气。根据标准药物蒸气生成系统的测试，估计的检测体积极限在低pptv范围内。该光谱仪可以检测气相中的可卡因碱，其浓度远低于其在20摄氏度时估计的100 pptv蒸气当量的浓度。本文描述了与麻醉药检测有关的现场离子光谱法的基本原理，以及可卡因的最新研究结果和海洛因。这项工作部分由美国高级研究计划局根据DAAB10-95C-0004合同赞助，用于DOD禁毒技术开发计划。 ！10

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