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Name: Melonie P.
Status: other
Age: 30s
Location: N/A
Country: N/A
Date: 2000-2001


Question:
Is it possible, when exposed to sewer gases or hydrogen sulfide at low or high consitration for long periods of time 8 hours day 5 days a week over a couple of years. Could it be possible that the exposure could alter body chemistry to cause gall stones or gall bladder problems? also, when exposed to this gas is it possible to have several women miscarry babies?


Replies:
Hydrogen sulfide is extremely toxic. The Environmental Protection Agency has set a time weighted average of an 8 hr. exposure at about 5 parts per million. However, I do not know the specific physiological changes it would cause.

Vince Calder

Up-date 1/26/2005

There are various concentrations of exposures set by different regulatory governmental agencies depending upon the level and time of exposure. These vary as new data becomes available. My info could have been based on older data. The most up to date info on H2S I've found is: OSHA Ceiling = 20 ppm; Peak = 50 ppm / 10 min; TLV/TWA = 10 ppm; TLV/STEL (short term exposure limit) = 15 ppm; TLV/IDLH (immediate danger to live/health)= 300 ppm; NIOSH Ceiling 10 ppm / 10 min. Evacuation = over 65 ppm.

Hydrogen sulfide is a colorless, very flammable gas. In low concentrations it smells like "rotten eggs" however the sense of smell is lost after 2-15 min of exposure making it impossible to smell dangerous concentrations.

Source: http://www.amgas.com/h2s.htm.

It is still a very toxic gas.

Vince Calder


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