All issues Volume 72 / No 4 (July–August 2017) Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 72 4 (2017) 24 Full HTMLH2S concentration for human contact time (Maddox, 1982).
| Period of exposure | Parts of H2S per million parts of air (ppm) |
|---|---|
| Maximum allowable concentration for prolonged exposure | 10 |
| Slight symptoms after exposure of several hours | 70-150 |
| Maximum concentration that can be inhaled for 1 h without serious consequences | 170-300 |
| Dangerous after exposure of 30 min to one hour | 400-500 |
| Fatal in exposure of 30 min or less | 600-800 |
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