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HYDROGEN SULFIDE ICSC: 0165
Date of peer-review: October 2000

Sulfur hydride
(cylinder)
CAS # 7783-06-4 H2S
RTECS # MX1225000 Molecular mass: 34.1
UN # 1053
EC # 016-001-00-4
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Extremely flammable.
NO open flames, NO sparks, and NO smoking.
Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with water spray, powder, carbon dioxide.
EXPLOSION Gas/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding) if in liquid state. Do NOT use compressed air for filling, discharging, or handling.
In case of fire: keep cylinder cool by spraying with water.
EXPOSURE
AVOID ALL CONTACT!
IN ALL CASES CONSULT A DOCTOR!
Inhalation Headache. Dizziness. Cough. Sore throat. Nausea. Laboured breathing. Unconsciousness. Symptoms may be delayed (see Notes).
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Half-upright position. Artificial respiration if indicated. No mouth-to-mouth artificial respiration. Refer for medical attention.
Skin ON CONTACT WITH LIQUID: FROSTBITE.
Cold-insulating gloves.
ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.
Eyes Redness. Pain. Severe deep burns.
Safety goggles, or eye protection in combination with breathing protection.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion
Do not eat, drink, or smoke during work.

SPILLAGE DISPOSAL PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Remove all ignition sources. Ventilation. Remove gas with fine water spray. (Extra personal protection: gas-tight chemical protection suit including self-contained breathing apparatus).
EU Classification
Symbol: F+, T+, N
R: 12-26-50
S: (1/2-)9-16-28-36/37-45-61
UN Classification
UN Hazard Class: 2.3
UN Subsidiary Risks: 2.1

EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-20G43 NFPA Code: H4; F4; R0;
Fireproof. Separated from strong oxidants. Cool. Keep in a well-ventilated room. Install continous monitoring system with alarm.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 2001

SEE IMPORTANT INFORMATION ON BACK


HYDROGEN SULFIDE ICSC: 0165
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS COMPRESSED LIQUEFIED GAS, WITH CHARACTERISTIC ODOUR OF ROTTEN EGGS.

PHYSICAL DANGERS:
The gas is heavier than air and may travel along the ground; distant ignition possible. As a result of flow, agitation, etc., electrostatic charges can be generated.

CHEMICAL DANGERS:
Heating may cause violent combustion or explosion. The substance decomposes on burning producing toxic gas (sulfur oxides). Reacts violently with strong oxidants, causing fire and explosion hazard. Attacks many metals and some plastics.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 10 ppm (as TWA) (ACGIH 2000). TLV: 15 ppm (STEL) (ACGIH 2000). MAK: 10 ppm; 15 mg/m^3; (1999)
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes and the respiratory tract. The substance may cause effects on the central nervous system. Exposure may result in unconsciousness. Exposure may result in death. Inhalation of gas may cause lung oedema (see Notes). The effects may be delayed. Medical observation is indicated. Rapid evaporation of the liquid may cause frostbite.

PHYSICAL PROPERTIES
Boiling point: -60C
Melting point: -85C
Solubility in water, g/100 ml at 20C: 0.5
Relative vapour density (air = 1): 1.19
Flash point: Flammable Gas
Auto-ignition temperature: 260C
Explosive limits, vol% in air: 4.3-46
ENVIRONMENTAL DATA
The substance is very toxic to aquatic organisms.
NOTES
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort. Rest and medical observation are therefore essential. Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available. The substance blocks the sense of smell. The odour warning when the exposure limit value is exceeded is insufficient.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 2001

See Also:
        Hydrogen sulfide (EHC 19, 1981)
        Hydrogen sulphide (CHEMINFO)