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Hydrogen sulfide is a highly flammable, explosive gas, and can cause possible life-threatening situations if not properly handled. In addition, hydrogen sulfide gas burns and produces other toxic vapors and gases, such as sulfur dioxide.
Typical background concentrations. Odor threshold – rotten egg smell. Permissible Exposure Level – 8 Hours. Possible fatigue, loss of appetite, headache, irritability, poor memory, dizziness. Intense odor. Above 30ppm odor is sweet or sickeningly sweet. Mild Irritation - eyes, throat – 1 Hour.
It has also been reported that 50 to 100 ppm causes mild conjunctivitis and respiratory irritation after 1 hour; 500 to 700 ppm may be dangerous in 0.5 to 1 hour; 700 to 1,000 ppm results in rapid unconsciousness, cessation of respiration, and death; and 1,000 to 2,000 ppm results in unconsciousness, cessation of respiration, and death in a few ...
If H2S levels are below 100 ppm, an air-puri-fying respirator may be used, assuming the filter cartridge/canister is appropriate for hydrogen sulfide. A full facepiece respirator will prevent eye irritation. If air concentrations are elevated, eye irrita-tion may become a serious issue.
Content source: National Institute for Occupational Safety and Health. Hydrosulfuric acid, Sewer gas, Sulfuretted hydrogen Colorless gas with a strong odor of rotten eggs. [Note: Sense of smell becomes rapidly fatigued & can NOT be relied upon to warn of the continuous presence of H<SUB>2</SUB>S.
At low levels, hydrogen sulfide causes irritation of the eyes, nose, and throat. Moderate levels can cause headache, dizziness, nausea, and vomiting, as well as coughing and difficulty in breathing.
Much of OSHA’s Permissible Exposure Data is based on studies from the 1960’s 70’s and 8o’s. The current OSHA web site identifies additional exposure limits for Hydrogen Sulfide. H2S Limit Overview NIOSH. Current NIOSH Recommended Exposure Limit (REL): 10 ppm (15mg/m3 CEILING) ACGIH. H2S CAS Number : 7783-06-04.
These fact sheets summarize the information on occurrence and health effects of the chemicals covered, presenting guideline values where these have been derived and the basis for their derivation, or where guideline values have not been derived, the rationale for not establishing such values.
What are fire hazards and extinguishing media for hydrogen sulfide? What are the stability and reactivity hazards of hydrogen sulfide? What are unintentional release measures for hydrogen sulfide? What handling and storage practices should be used when working with hydrogen sulfide?
Hydrogen sulfide (also known as H 2 S, sewer gas, swamp gas, stink damp, and sour damp) is a colorless gas known for its pungent "rotten egg" odor at low concentrations. It is extremely flammable and highly toxic.