Hydrogen sulfide
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Synonyms & Trade Names
Hydrosulfuric acid, Sewer gas, Sulfuretted hydrogen
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CAS No.
7783-06-4
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RTECS No.
MX1225000
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DOT ID & Guide
1053 117
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FormulaH2S
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Conversion
1 ppm = 1.40 mg/m3
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IDLH
100 ppm
See: 7783064
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Exposure Limits
NIOSH REL: C 10 ppm (15 mg/m3) [10-minute]
OSHA PEL†: C 20 ppm 50 ppm [10-minute maximum peak]
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Measurement Methods
NIOSH 6013;
OSHA ID141
See: NMAM or OSHA Methods |
Physical Description
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 H2S. Shipped as a liquefied compressed gas.]
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MW: 34.1
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BP: -77°F |
FRZ: -122°F |
Sol: 0.4% |
VP: 17.6 atm |
IP: 10.46 eV |
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Fl.P: NA (Gas) |
UEL: 44.0% |
LEL: 4.0% |
RGasD: 1.19 |
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| Flammable Gas |
Incompatibilities & Reactivities
Strong oxidizers, strong nitric acid, metals
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Exposure Routes
inhalation, skin and/or eye contact
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Symptoms
irritation eyes, respiratory system; apnea, coma, convulsions; conjunctivitis, eye pain, lacrimation (discharge of tears), photophobia (abnormal visual intolerance to light), corneal vesiculation; dizziness, headache, lassitude (weakness, exhaustion), irritability, insomnia; gastrointestinal disturbance; liquid: frostbite
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Target Organs
Eyes, respiratory system, central nervous system
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Personal Protection/Sanitation
(See protection codes)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite wash |
First Aid
(See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support
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Respirator Recommendations
NIOSH Up to 100 ppm:
(APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern
(APF = 10) Any supplied-air respirator*
(APF = 50) Any self-contained breathing apparatus with a full facepiece Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern
Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection |
| See also: INTRODUCTION
See ICSC CARD: 0165
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832-615-3588