What indicates a possible H2S leak?

What indicates a possible H2S leak?

• A. No odor detected
• B. An odor of rotten eggs
• C. Smell of chlorine
• D. Sweet chemical odor

Answer: (B)

A rotten-egg odor signals a possible hydrogen sulfide leak. Hydrogen sulfide has a distinctive sulfurous, rotten-egg smell at low to moderate concentrations, so detecting that odor in an AFFF transfer area serves as a warning that H2S could be present. Because H2S is highly toxic and olfactory fatigue can occur (you can lose the ability to smell it as concentrations rise), it’s essential to act on the odor by following safety procedures, using gas detectors, and evacuating or isolating the area as required. The other sensations listed don’t indicate hydrogen sulfide: no odor can occur even with a leak, a chlorine-like smell points to chlorine gas, and a sweet chemical odor suggests a different substance.

A rotten-egg odor signals a possible hydrogen sulfide leak. Hydrogen sulfide has a distinctive sulfurous, rotten-egg smell at low to moderate concentrations, so detecting that odor in an AFFF transfer area serves as a warning that H2S could be present. Because H2S is highly toxic and olfactory fatigue can occur (you can lose the ability to smell it as concentrations rise), it’s essential to act on the odor by following safety procedures, using gas detectors, and evacuating or isolating the area as required. The other sensations listed don’t indicate hydrogen sulfide: no odor can occur even with a leak, a chlorine-like smell points to chlorine gas, and a sweet chemical odor suggests a different substance.