Although natural sources provide significant amounts of hydrogen sulfide, you can create it in a laboratory by adding an acid, such as concentrated sulfuric acid, to a sulfide, such as sodium sulfide. Distillation of petroleum also produces the gas. You may purchase H2S if you don't want to make it, but shipping regulations could affect its sale. H2S is in the same chemical asphyxiate class as cyanide and carbon monoxide, and is extremely toxic. Therefore, it's important to minimize exposure to this gas; 50 to 200 parts per million can cause problems ranging from eye irritation to death.
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