[bungchung]

Hi All,

I'm currently stumped as to what the chemical reaction is that's producing H2S

I have a length of pipe made out of steel that has a layer of Iron Oxide. I've performed SEM EDS that indicate that there are clusters of Barium 50% wt, Sulfide 11% wt and Oxygen 26% wt; most likely BaSO4/Barite?
As soon as i pour 15% HCl into the pipe; H2S Draeger testing indicates that there is a production of H2S

From what i know; the reaction between Barite and HCl is extremely slow and the reaction would produce BaCl2 + H2SO4?

What could be happening to produce H2S?

Any help would be appreciated 

Cheers,

[chenbeier]

This can only be happen, if you have also sulfide S^2- in your sample. The SEM EDX doesn't indicate it is SO₄^2- or S^2-.