基于紫外光离子源高场不对称波形离子迁移谱的化学战剂模拟剂检测

Detection of Chemical Warfare Agent Simulants by UV Photoionization High-Field Asymmetric Ion Mobility Spectrometry

通过扩散法制得低浓度的对甲基膦酸二甲酯(DMMP)、磷酸三丁酯(TBP)、二甲基亚砜(DMSO)3种化学战剂模拟剂蒸气,并用自制紫外光离子源高场不对称波形离子迁移谱仪(Ultraviolet photoionization high field asymmetric ion mobility spectrometry,UV-FAIMS)对其进行检测,得到不同样品在不同分离电压下特征谱图,并通过对多组分离电压(Dispersion voltage,DV)和补偿电压(Compensation voltage,CV)求解,建立了α2和α4二维谱图,提高了FAIMS的分辨识别能力。此外,对UV-FAIMS的检测灵敏度进行了测定。实验表明,此系统对甲基膦酸二甲酯(DMMP)的检测灵敏度优于0.55μg/L。

Accurate diffusion was used to get low concentrations samples, and then the samples were detected by UV photoionization high-field asymmetric ion Mobility spectrometry （UV-FAIMS）. The samples were chemical warfare agent simulants （CWAS） vapor： dimethyl methylphosphonate （DMMP）, dimethyl sulfoxide （DMSO）, tributyl phosphate （TBP） and dimethyl sulfoxide （DMF）. The results of FAIMS spectra data were analyzed by separation of spectra at different dispersion voltage （DV） and compensation voltage （CV）. A two-dimensional spectrum of % and a4 of CWAS was established. It was shown that FAIMS could identify CWAS well and have a good sensitivity. Take DMMP as a example, the detection limit was better than O. 55μg/L.