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.