Abstract

A low-cost differential mobility spectrometer (DMS) was constructed using polytetrafluoroethylene printed circuit boards with two pairs of gold electrodes. The printed circuit boards were used to construct the drift tube into which the gas samples are introduced by a carrier gas and ionized. The ionized gas moves toward the gold electrode to which an asymmetric voltage is applied. Only the ionized gas with the proper ion mobility leaves the electrode region and reach the detection electrodes to form the ion current. Traces of five chemical warfare agents, including dimethyl methylphosphonate, triethylamine, 2-diisopropylaminoethanol, diethylaminoethanol, and N, N-dimethylethanolamine, were prepared using the permeation tube method and introduced into the sensor. All of the chemicals show characteristic ion peak shifts in the electric field. The limits of detection for the analytes are less than 1 ng/L. The recovery time was less than 10 s and the response time is 2 s. The developed sensor exhibits the ability to detect and distinguish between these chemical warfare agents.

摘要

使用带有两对金电极的聚四氟乙烯印刷电路板构建了一种低成本的差分迁移谱仪 (DMS)。印刷电路板用于构建漂移管，气体样品通过载气引入并电离。电离气体向施加有不对称电压的金电极移动。只有具有适当离子迁移率的电离气体才会离开电极区域并到达检测电极以形成离子电流。使用渗透管法制备痕量甲基膦酸二甲酯、三乙胺、2-二异丙基氨基乙醇、二乙氨基乙醇和N,N-二甲基乙醇胺等5种化学战剂并导入传感器。所有化学品在电场中都显示出特征性的离子峰位移。分析物的检测限小于 1 ng/L。恢复时间小于 10 秒，响应时间为 2 秒。开发的传感器具有检测和区分这些化学战剂的能力。