Tankerman · Safety — H2S
When handling a cargo that may contain hydrogen sulfide (H2S), a key precaution is that H2S:
- ACan deaden the sense of smell at dangerous concentrations, so detection must rely on instruments✓ Correct
- BHas no health effect
- CIs lighter than air and harmless
- DSmells stronger as it gets more dangerous
Explanation
H2S smells of rotten eggs at low levels but rapidly paralyzes the sense of smell, so odor is no warning at lethal concentrations. Personal and fixed H2S monitors, PPE, and special procedures are required for sour cargoes.
Authority: ISGOTT; OSHA
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