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SODIUM HYDROGENSULFIDE
ICSC: 1710
Peer-Review Status: 09.04.2008 Validated
Sodium bisulfide
Sodium mercaptan
Sodium mercaptide
Sodium hydrosulfide
Sodium sulfhydrate
CAS #: 16721-80-5 RTECS #: WE1900000
UN #: see Notes
EINECS #: 240-778-0
    Formula: NaHS
Molecular mass: 56.1

TYPES OF HAZARD
/ EXPOSURE
ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE-FIGHTING
FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames.  Use water spray, foam, powder, carbon dioxide. 
EXPLOSION     In case of fire: keep drums, etc., cool by spraying with water. NO direct contact with water. 
 
EXPOSURE   AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Sore throat. Burning sensation. Shortness of breath. Laboured breathing. Unconsciousness.  Use local exhaust or breathing protection.  Half-upright position. Artificial respiration may be needed. Refer immediately for medical attention. 
Skin Redness. Pain. Skin burns.  Protective gloves. Protective clothing.  Rinse skin with plenty of water or shower. Refer immediately for medical attention. 
Eyes Redness. Pain. Burns.  Wear safety goggles or eye protection in combination with breathing protection.  Rinse with plenty of water (remove contact lenses if easily possible). Refer immediately for medical attention. 
Ingestion Sore throat. Burns in mouth and throat. Abdominal pain. Vomiting. Shock or collapse.  Do not eat, drink, or smoke during work.  Rinse mouth. Give one or two glasses of water to drink. Do NOT induce vomiting. Refer immediately for medical attention. 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance and filter respirator for inorganic gases and vapours adapted to the airborne concentration of the substance. Sweep spilled substance into covered plastic containers. Then store and dispose of according to local regulations.  Do not transport with food and feedstuffs. 
EC Classification
 
UN Classification
 
GHS Classification
Signal: Danger
Fatal if swallowed
Toxic in contact with skin
Causes severe skin burns and eye damage
May cause respiratory irritation 
corrskull;toxic

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-80S2949 or 80GC6-II+III for UN 2949; 42GS4-II+III for UN 2318.  Fireproof. Dry. Keep in a well-ventilated room. Separated from acids and strong oxidants. 

IMPORTANT DATA
Physical State; Appearance
WHITE HYGROSCOPIC CRYSTALS WITH CHARACTERISTIC ODOUR. 

Physical dangers
 

Chemical dangers
The solution in water is a strong base. It reacts violently with acid and is corrosive. Decomposes on heating. This produces sulfur oxides. Decomposes on contact with water. This produces highly toxic and flammable hydrogen sulfide (see ICSC 0165). Attacks metal. Reacts with strong oxidants. This produces sulfur oxides. 

Occupational exposure limits
TLV not established.
MAK (not established):. 

Routes of exposure
Serious local effects by all routes of exposure. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly when dispersed. 

Effects of short-term exposure
The substance is substance corrosive to the eyes, skin and respiratory tract. Inhalation may cause lung oedema. See Notes. Corrosive on ingestion. The substance hydrolyses rapidly on exposure to moisture releasing H2S. See ICSC 0165 . 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Decomposes at 350°C
Density: 1.8 g/cm³
Solubility in water, g/100ml at 20°C: 50-60 (good)
Vapour pressure: negligible
Octanol/water partition coefficient as log Pow: -3.5  
 

NOTES
CAS No for sodium hydrogensulfide hydrate is 207683-19-0.
UN 2318 refers to SODIUM HYDROSULFIDE with less than 25% water of crystallization; Hazard Class 4.2, Packing Group II.
UN 2949 refers to SODIUM HYDROSULFIDE, hydrated with not less than 25% water of crystallization; Hazard Class 8 (corrosive), Packing Group II
Immediate administration of an appropriate inhalation therapy by a doctor, or by an authorized person, should be considered. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
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    See Also:
       Toxicological Abbreviations