中国人民解放军陆军防化学院
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张永谦, 高适, 左国民, 等. 基于水分掺杂的高场非对称波形离子迁移谱检测硫化氢的研究[J]. 分析测试学报, 2020,39(2):239-245.
Research on Detection of Hydrogen Sulfide by High field Asymmetric Waveform Ion Mobility Spectrometry Based on Water Doping[J]. 2020,39(2):239-245.
高场非对称波形离子迁移谱(FAIMS)是一种芯片级高灵敏度快速分析检测技术,其在大气压环境下工作的特点使之受环境影响明显,其中气体的湿度是显著影响因素,湿度的变化可引起迁移区离子反应机理以及迁移过程的变化。该文研究了干燥条件下痕量硫化氢的定量检测方法,确定了DF=33%时的检测线性范围与回归方程。利用PTFE管渗透作用,设定水浴温度为40~90 ℃,考察了不同含量水分对FAIMS检测硫化氢的影响。通过考察不同湿度下硫化氢的FAIMS特征谱图以及特征离子峰,研究了掺杂水分对于硫化氢谱峰峰值、补偿电压以及检测分辨率的影响。结果表明,FAIMS对于硫化氢的检测谱图清晰可见,能够准确定位其特征离子峰。随着气体中水分增多,不同分离电场下的产物离子峰峰值增大,说明湿度增大在一定程度上提高了灵敏度,DF=35%时的检出限为1.43×10-3 mg/m3。
High field asymmetric waveform ion mobility spectrometry(FAIMS) is a chip level rapid analysis technique with high sensitivity.Its characteristics under atmospheric pressure make it easily affected by the environment,of which the humidity of the gas is a significant factor.The variation of humidity caused change of the reaction mechanism of ions in the migration zone and change of the migration process.A method based on FAIMS was developed for the quantitative detection of trace hydrogen sulfide under dry conditions,and the linear range and regression equation of the detection at DF=33% were determined.Effects of different moisture contents on the detection of hydrogen sulfide by FAIMS were investigated by using the PTFE tube penetration effect and setting the water bath temperature at 40-90 ℃,while the effects of doped moisture on the peak value,compensation voltage,and resolution were studied by examining the FAIMS characteristic spectra and ionic peaks of hydrogen sulfide under different humidity.Results showed that FAIMS was clearly visible for the detection of hydrogen sulfide,and could accurately locate its characteristic ion peak.With the increase of moisture in the gas,the peak values of the product ions under different separation electric fields increased,indicating that the increase in humidity improved the sensitivity,to a certain extent.The detection limit at DF=35% was 1.43×10-3 mg/m3.
高场非对称波形离子迁移谱掺杂水分检出限分辨率
high field asymmetric waveform ion mobility spectrometry(FAIMS)waterdopingdetection limitresolution
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