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| Hydrogen sulfide | CAS 7783-06-4 | ||
| H2S | RTECS MX1225000 | ||
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Synonyms & Trade Names Hydrosulfuric acid, Sewer gas, Sulfuretted hydrogen |
DOT ID & Guide 1053 117 |
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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] | |||
| IDLH 100 ppm See: 7783064 | Conversion 1 ppm = 1.40 mg/m3 | ||
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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 |
BP: -77°F |
FRZ: -122°F |
Sol: 0.4% |
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VP: 17.6 atm |
IP: 10.46 eV |
RGasD: 1.19 |
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Fl.P: NA (Gas) |
UEL: 44.0% |
LEL: 4.0% |
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| Flammable Gas | |||
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Incompatibilities & Reactivities Strong oxidizers, strong nitric acid, metals |
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Measurement Methods NIOSH 6013; OSHA ID141 See: NMAM or OSHA Methods |
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Personal Protection & Sanitation Skin: Frostbite Eyes: Frostbite Wash skin: No recommendation Remove: When wet (flammable) Change: No recommendation Provide: Frostbite |
First Aid (See procedures) Eye: Frostbite Skin: Frostbite Breathing: Respiratory support |
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Important additional information about respirator selection 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 |
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| 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 | |
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Target Organs
Eyes, respiratory system, central nervous system |
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| See also: INTRODUCTION See ICSC CARD: 0165 See MEDICAL TESTS: 0119 |