Sodium sulhydrate
Sodium bisulfide
Sodium mercaptan
Sodium mercaptide
Sodium hydrosulfide
NaHS
Molecular mass: 56,1
ICSC # 1710
CAS # 16721-80-5
RTECS # WE1900000
UN # See Notes
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Types of Hazard/ Exposure
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Acute Hazards/ Symptoms
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Prevention
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First Aid/
Fire Fighting
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FIRE
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Combustible.
Gives off irritating or toxic fumes (or gases) in a fire.
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NO open flames.
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Water spray, foam, powder, carbon dioxide
.
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Explosion
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In case of fire: cool drums, etc., by spraying with water but avoid contact of the substance with water.
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Exposure
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AVOID ALL CONTACT!
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IN ALL CASES CONSULT A DOCTOR!
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•Inhalation
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Sore throat.
Burning sensation.
Shortness of breath.
Laboured breathing.
Unconsciousness.
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Local exhaust or breathing protection.
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Half-upright position.
Artificial respiration may be needed.
Refer immediately for medical attention.
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•Skin
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Redness.
Pain.
Skin burns.
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Protective gloves.
Protective clothing.
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Rinse skin with plenty of water or shower.
Refer immediately for medical attention.
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•Eyes
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Redness.
Pain.
Burns
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Safety goggles
or
eye protection in combination with breathing protection.
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Rinse with plenty of water (remove contact lenses if easily possible).
Refer immediately for medical attention.
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•Ingestion
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Sore throat.
Burns in mouth and throat.
Abdominal pain.
Vomiting.
Shock or collapse.
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Do not eat, drink, or smoke during work.
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Rinse mouth.
Give one or two glasses of water to drink.
Do NOT induce vomiting.
Refer immediately for medical attention.
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Spillage Disposal
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Storage
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Packaging & Labelling
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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 plastic containers
then remove to safe place.
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Fireproof.
Dry.
Keep in a well-ventilated room.
Separate from acids
and
strong oxidants.
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Do not transport with food and feedstuffs.
Signal: Danger
Corr-Skull
Fatal if swallowed
Toxic in contact with skin
Causes severe skin burns and eye damage
May cause respiratory irritation
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Important Data
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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.
The substance decomposes
on heating
producing
sulfur oxides
.
The substance decomposes
on contact with
water
producing
hydrogen sulfide
.
Attacks metal.
Reacts with strong oxidants
to produce
sulfur oxides
(See ICSC 0165)
.
Occupational Exposure Limits:
TLV not established.
MAK not established.
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Routes of Exposure:
Serious local effects by all routes of exposure.
at 96mg/kg; 150 mg/kg; 200 mg/kg. Dermal LD50 mouse 200 mg/kg. Corrosive so no route selected.
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 corrosive to
the eyes
,
the skin
and
the respiratory tract.
Inhalation may cause lung oedema (see Notes).
Corrosive on ingestion.
The substance hydrolyses rapidly on exposure to moisture releasing H2S
:
see also ICSC 0165
Effects of Long-Term or Repeated Exposure:
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Physical
Properties
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Melting point: 350°C
Decomposes
Density: 1.8 g /cm3
Solubility in water, g/100 ml at 20°C: 50-60
(good)
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Vapour pressure, Pa at °C: negligible
Octanol/water partition coefficient as log Pow: -3.5
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Environmental
Data
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N O T E S
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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 a person authorized by him/her, should be considered.
Transport Emergency Card: TEC (R)- 80S2949 or 80GC6-II+III for UN 2949; 42GS4-II+III for UN 2318
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ADDITIONAL INFORMATION
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ICSC: 1710
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SODIUM HYDROGENSULFIDE
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(C) IPCS, CEC, 1994
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IMPORTANT LEGAL NOTICE:
Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH,
the CEC or the IPCS is responsible for the use which might be made of this
information. This card contains the collective views of the IPCS Peer Review Committee and may
not reflect in all cases all the detailed requirements included in national legislation
on the subject. The user should verify compliance of the cards with the relevant legislation
in the country of use.
The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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