Determination of Trace Hydrogen Sulfide by Cryogenic Adsorption-Thermal Desorption Gas Chromatography

A method for the determination of trace hydrogen sulfide(H_2S) in the air by gas chromatography was developed.Chromosorb G was used as the adsorbent to adsorb the H_2S and the self-developed thermo-regulator oven was used to desorb it at 130 ℃ for 4 min.The gas was then introduced directly into gas chromatograph and detected by FPD.The detection limit for one liter sample was 0.192 ng/L.The precision and recovery tests were satisfactory.