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Chemical Hazards - Hydrogen sulfide |
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NIOSH Chemical Hazards-Hydrogen sulfide
Hydrogen sulfide |
CAS 7783-06-4 |
H2S |
RTECS MX1225000 |
Synonyms & Trade Names
Hydrosulfuric acid, Sewer gas, Sulfuretted hydrogen |
DOT ID & Guide
1053 117 |
Exposure
Limits |
NIOSH REL: C 10 ppm (15 mg/m3) [10-minute] |
| OSHA PEL†: C 20 ppm 50 ppm [10-minute maximum peak] |
IDLH 100 ppm See: 7783064 |
Conversion 1 ppm = 1.40 mg/m3 |
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.] |
MW: 34.1
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BP: -77°F
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FRZ: -122°F
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Sol: 0.4%
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VP: 17.6 atm
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IP: 10.46 eV
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RGasD: 1.19
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Fl.P: NA (Gas)
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UEL: 44.0%
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LEL: 4.0%
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| Flammable Gas |
Incompatibilities & Reactivities
Strong oxidizers, strong nitric acid, metals |
Measurement Methods
NIOSH 6013; OSHA ID141
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: When wet (flammable)
Change: No recommendation
Provide: Frostbite wash
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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 |
Exposure Routes inhalation, skin and/or eye contact |
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 |
Target Organs Eyes, respiratory system, central nervous system
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