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Hydrogen sulfide (or H2S) is a colorless, toxic and flammable gas. Hydrogen sulfide is considered a broad-spectrum poison, meaning that it can poison several different systems in the body, although the nervous system is most affected.
| H2S Toxicity |
Physical Reaction |
| 0.03 ppm |
Can smell. Exposure is safe for up to 8 hours. |
| 4 ppm |
May cause eye irritation. Mask must be used, as it damages metabolism. |
| 10 ppm |
10 minute maximum exposure. Kills smell in 3-15 min. Causes gas eye and throat injury. Reacts violently with dental mercury amalgam fillings. |
| 20 ppm |
Exposure for more than 1 min causes severe injury to eye nerves. |
| 30 ppm |
Loss of smell, injury to blood brain barrier through olfactory nerves. |
| 100 ppm |
Respiratory paralysis in 30-45 min. Needs prompt artificial resuscitation. Will become unconscious quickly (15 min max). |
| 200 ppm |
Serious eye injury and permanent damage to eye nerves. Stings eye and throat. |
| 300 ppm |
Loses sense of reasoning and balance. Respiratory paralysis in 30-45 min. |
| 500 ppm |
Asphyxia! Needs prompt artificial resuscitation. Will become unconscious in 3-5 min. Immediate artificial resuscitation is required. |
| 700 ppm |
Breathing will stop and death will result if not rescued promptly, immediate unconsciousness. Permanent brain damage may result unless rescued promptly. |
(Chart duplicated from: http://emedicine.medscape.com/article/815139-overview)
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