Pacific Northwest National Laboratory, Richland, WA 99352, United States.
Anal Chem. 2013 Jan 2;85(1):389-97. doi: 10.1021/ac302828g. Epub 2012 Dec 17.
The results in this manuscript represent a demonstration of RDX vapor detection in real time at ambient temperature without sample preconcentration. The detection of vapors from the low volatility explosive compound RDX was achieved through selective atmospheric pressure chemical ionization using nitrate reactant ions (NO(3)(-)) and NO(3)(-)·HNO(3) adducts generated in an electrical discharge source. The RDX vapors were ionized in a reaction region, which provided a variable (up to several seconds) reaction time. The reaction times were controlled either by flow in an atmospheric flow tube (AFT) or by an electric field in an atmospheric drift tube (ADT). Both AFT and ADT were interfaced to a quadrupole mass spectrometer for ion detection and identification. Recorded signals were observed for RDX concentrations below 25 ppq using selected ion monitoring (SIM) of the RDX-nitrate adduct at m/z 284.
本文展示了一种无需样品预浓缩即可在环境温度下实时检测 RDX 蒸气的方法。通过使用硝酸盐反应离子（NO(3)(-))和在放电源中生成的 NO(3)(-)·HNO(3)加合物进行选择性常压化学电离，实现了对低挥发性爆炸化合物 RDX 蒸气的检测。RDX 蒸气在反应区中被离解，该反应区提供了可变（长达数秒）的反应时间。通过在大气流管（AFT）中流动或在大气漂移管（ADT）中施加电场来控制反应时间。AFT 和 ADT 均与四极杆质谱仪接口，用于离子检测和识别。使用 m/z 284 处的 RDX-硝酸盐加合物的选择离子监测（SIM），在低于 25 ppq 的 RDX 浓度下观察到了记录的信号。
