Hydrogen sulfide sensor

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A hydrogen sulfide sensor or H2S sensor is a gas sensor for the measurement of hydrogen sulfide.[1]

In laboratory , hydrogen sulphide is prepared by the action of dilute sulphuric acid on iron sulphide.  
            FeS(s)+H2So4(aq) = Feso4(aq) + H2S(g)

Conc.H2so4 and nitric acid cannot be used for this process as they behave as oxidizing hydrogen sulphide to sulphur A Woulf's bottle is fitted with thistle funnel and a delivery tube as shown in figure . Dilute H2SO4 is run down the funnel so as to cover the iron sulphide placed at bottom of the bottle. When iron sulphide react with dilute sulphuric acid, hydrogen sulphide is formed which is collected in the gas jar by upward displacement of air. Purification of H2S gas H2s gas obtained from above may contain hydrogen gas and acid impurities. So it is passed through a suspension of MgO in water which gives magnesium bisulphide . the bisulphide on heating abovItalic texte 60degree centigrade gives a steady stream of pure H2S gas.

     MgO + 2H2S = Mg(HS)2 + H2O

Mg(HS)2- MgS + H2S Drying of gas H2S gas is dried over phosphorous pentoxide (P203).


This type of sensor has been under constant development because of the toxic and corrosive nature of hydrogen sulfide:

  • The H2S sensor is used to detect hydrogen sulfide in the hydrogen feed stream of fuel cells to prevent catalyst poisoning and to measure the quality of guard beds used to remove sulfur from hydrocarbon fuels.[2]/-


See also[edit]