Chart of the Toxicity of Hydrogen Sulfide Gas







Chart corrected 1/12/2002, due
to e-mail from a victim of H2S poisoning
 0.03 ppm Can smell. Safe for 8 hours exposure
 4 ppm May cause eye irritation. Mask must
be used as it damages metabolism.
 10 ppm Maximum exposure 10 minutes. Kills
smell in 3 to 15 minutes. Causes GAS EYE and throat injury. Reacts violently
with dental mercury amalgam fillings.
 20 ppm Exposure for more than 1 minute 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 to 45 minutes.
Needs prompt artificial resuscitation. Will become unconscious quickly (15
minutes maximum)
 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 to 45 minutes
500 ppm Asphyxia! Needs prompt artificial
resuscitation. Will become unconscious in 3 to 5 minutes. 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.


 
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 References

0.03 ppm	Can smell. Safe for 8 hours exposure
4 ppm	May cause eye irritation. Mask must be used as it damages metabolism.
10 ppm	Maximum exposure 10 minutes. Kills smell in 3 to 15 minutes. Causes GAS EYE and throat injury. Reacts violently with dental mercury amalgam fillings.
20 ppm	Exposure for more than 1 minute 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 to 45 minutes. Needs prompt artificial resuscitation. Will become unconscious quickly (15 minutes maximum)
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 to 45 minutes
500 ppm	Asphyxia! Needs prompt artificial resuscitation. Will become unconscious in 3 to 5 minutes. 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.