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Comment by refurb

9 years ago

If I remember correctly, a fatal concentration of H2S is actually lower than HCN (hydrogen cyanide).

Many people each year succumb to H2S poisoning. It's a pretty insidious poison.

And for those interested, H2Se has an LC50 about an order of magnitude lower than H2S. Fortunately S/Se in crude oil is likely to be >10000. It smells like garlic.