采用高场非对称波形离子迁移谱对二氧化硫进行分析检测，建立了动态气体浓度配气系统，考察了0.025×10^-6~7.5×10^-6范围内的FAIMS响应峰值、信噪比等信号参数，分析得出了二氧化硫在负模式下电离生成了一种产物离子（SO₂）O₂^-（H₂O）_n-1，且峰值随浓度增大先增大后逐渐饱和，其中分离电场为45%时SO₂产物离子峰峰值与浓度呈一定线性，线性方程为y=0.793 3x+0.059 2，线性回归率为0.971，FAIMS对二氧化硫的检测下限为3.5×10^-9，证实了FAIMS灵敏度高的特性，并且可以对物质进行定量和半定量检测，对危险化学品事故应急侦检具有指导意义。

High field asymmetric waveform ion mobility spectrometry (FAIMS) is used to analyze and detect sulfur dioxide,and a dynamic gas concentration distribution system is established.Signal parameters such as FAIMS response peak values and signal-to-noise ratio in the range of 0.025×10^-6-7.5×10^-6 are investigated.It is analyzed that in the negative mode,sulfur dioxide ionizes to form a product ion,namely (SO₂)O₂^-(H₂O)_n-1.Peak value of product ion increases firstly and saturates then as the concentration of sulfur dioxide increases,where the product ion peak value of SO₂ has a linear relationship with the concentration at DF=45%.The linear equation is y=0.793 3x+0.059 2,with a linear regression rate of 0.971.The lower limit of detection for sulfur dioxide by FAIMS is 3.5×10^-9.It is confirmed that FAIMS exhibits high sensitivity,and can quantitatively and semi-quantitatively detect substances,which has important guiding significance for emergency detection of dangerous chemical accidents.

张永谦(1995-),男,硕士,研究方向为核生化特种污染环境,sneaker_zyq@sina.com