Hydrogen Sulfide Gas in radiators - Advice needed

[Ric2013]

I'm a bit confused about this hydrogen sulphide issue. H2S would result from the anaerobic decomposition of organic matter, not as a byproduct of the oxidation of iron, which would, I think, be pure hydrogen. I'm not aware that there is any sulphur (S) to be found in a heating system primary circuit unless a bird has pooed in the F&E.

Feel free to shoot me down: chemistry always was my weakest science at school.

 

[Richard4241]

I'm a bit confused about this hydrogen sulphide issue. H2S would result from the anaerobic decomposition of organic matter, not as a byproduct of the oxidation of iron, which would, I think, be pure hydrogen. I'm not aware that there is any sulphur (S) to be found in a heating system primary circuit unless a bird has pooed in the F&E.

Feel free to shoot me down: chemistry always was my weakest science at school.

Hi Rick. Can confirm no bird or any other animal has poohed in my system. It's the rotten egg smell and Sentinel's website that lead me to beleive it was hydrogen sulphide. Since cleaner & flushing, the gassing (whatever it was) seems to have stopped.... so far. Thanks for your comments - sounds plausible.

 

[Richard4241]

Third & Final Update. Problem solved.
System drained (yet again), new magnet/vortex filter fitted then used Sentinel X300 cleaner to get rid of flux from new pipework, flushed out, refilled system and put in 1.5 litres of Sentinel X100 inhibitor.
No more hydrogen/hydrogen sulfide/hydrogen sulphide gas and no more gurgling noises or gas in the system!
Thanks to everybody for their help and advice and hope this thread helps others. Cheers and a Merry Christmas to all.