Sodium hydrosulfide, solid

  • Sodium sulfhydrate
Formula
HNaS.xH2O
Structure
Description
Yellow-pink or white crystals, flakes or lumps.
Uses
Prodn of heavy water for nuclear reactors.

Registry Numbers and Inventories.
CAS
16721-80-5
EC (EINECS/ELINCS)
240-778-0
RTECS
WE1900000
RTECS class
Mutagen
UN (DOT)
2922
Merck
12,8730
Beilstein/Gmelin
19160 (G)
RCRA
D003
Swiss Giftliste 1
G-6816
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
HNaS
Formula mass
56.06
Melting point, °C
350
Vapor pressure, mmHg
49 (25 C)
Odor Threshold Odor threshold 0.0047 ppm
Density
1.79 g/cm3
Solubility in water
Soluble

Hazards and Protection.
Storage
Keep containers tightly closed in a well ventilated area away from food products. Keep away from heat and water. Store at temperatures above 63 degrees F.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Rubber protective equipment, such as apron, boots, splash-proof goggles, gloves; canister-type respirator or self-contained breathing apparatus.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Add soda ash (Na2CO3). Allow to aerate. Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Readily hydrolyzed in moist air to sodium hydroxide and sodium sulfide.
Incompatibilities
Reacts with acids rapidly and exothermically to release hydrogen sulfide Reacts violently with diazonium salts.
Decomposition
Decomposes to hydrogen sulfide and free alkali. When heated to decomposition it emits toxic fumes of sulfoxides and na2o.

Fire.
Flash Point,°C
90
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Apply water from as far a distance as possible.
Fire potential
Flammable/combustible material.
Hazards
Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Combustion products
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Health.
Poison_Class
2
Exposure effects
Patients may acutely present with low heart rate, rapid heart rate, hyperventilation, respiratory depression even to the point of apnea, and/or hypo-/elevated blood pressure. Asphyxial seizures, coma, and death associated with rapid respiratory paralysis may be noted following exposure to high concentrations. Headache, sweating, vertigo, anosmia, irritability, staggering gait, disorientation, somnolence, weakness, confusion, and delirium may be noted following exposure to non-fatal levels. Spontaneous abortions have occurred after exposure to life-threatening concentrations.
   Ingestion
Nausea and vomiting may be noted. Weight loss can be seen with chronic exposure.
   Inhalation
Respiratory depression, cyanosis, pulmonary edema, bronchitis, and dyspnea may be noted following exposure to non-fatal concentrations.
   Skin
Skin exposure may result in severe pain, itching, and erythema, especially in moist areas. Cyanosis may be noted following severe exposure.
   Eyes
See Skin.

First aid
 
   Ingestion
Hydrogen sulfide is a gas at room temperature (harbison, 1998), making ingestion unlikely.
   Inhalation
Immediately move patient to fresh air and administer 100 percent oxygen. Prevent self-exposure and possible death by wearing a self-contained breathing apparatus to rescue the victim.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
In case of contact with substance, immediately flush with running water for at least 20 minutes.

Transport.
UN number
2922
Response guide
Hazard class
8
Packing Group
I; II; III
 
USCG CHRIS Code
SHR
 
Std. Transport #
4935267 4935669
 
IMO Chemical Code
17
IMO Pollution Category
B
IMO Hazard code
S/P
Sodium hydrosulfide, solid

Sodium hydrosulfide, solid

  • Sodium sulfhydrate
Formula
NaHS.xH2O
Structure
Description
Yellow-pink or white crystals, flakes or lumps.
Uses
Prodn of heavy water for nuclear reactors.

Registry Numbers and Inventories.
CAS
16721-80-5
EC (EINECS/ELINCS)
240-778-0
RTECS
WE1900000
RTECS class
Mutagen
UN (DOT)
2923, 2949
Merck
12,8730
Beilstein/Gmelin
19160 (G)
RCRA
D003
Swiss Giftliste 1
G-6816
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
HNaS
Formula mass
56.06
Melting point, °C
350
Vapor pressure, mmHg
49 (25 C)
Odor Threshold Odor threshold 0.0047 ppm
Density
1.79 g/cm3
Solubility in water
Soluble

Hazards and Protection.
Storage
Keep containers tightly closed in a well ventilated area away from food products. Keep away from heat and water. Store at temperatures above 63 degrees F.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Rubber protective equipment, such as apron, boots, splash-proof goggles, gloves; canister-type respirator or self-contained breathing apparatus.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Add soda ash (Na2CO3). Allow to aerate. Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Readily hydrolyzed in moist air to sodium hydroxide and sodium sulfide.
Incompatibilities
Reacts with acids rapidly and exothermically to release hydrogen sulfide Reacts violently with diazonium salts.
Decomposition
Decomposes to hydrogen sulfide and free alkali. When heated to decomposition it emits toxic fumes of sulfoxides and na2o.

Fire.
Flash Point,°C
90
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Apply water from as far a distance as possible.
Fire potential
Flammable/combustible material.
Hazards
Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated.
Combustion products
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Health.
Poison_Class
2
Exposure effects
Patients may acutely present with low heart rate, rapid heart rate, hyperventilation, respiratory depression even to the point of apnea, and/or hypo-/elevated blood pressure. Asphyxial seizures, coma, and death associated with rapid respiratory paralysis may be noted following exposure to high concentrations. Headache, sweating, vertigo, anosmia, irritability, staggering gait, disorientation, somnolence, weakness, confusion, and delirium may be noted following exposure to non-fatal levels. Spontaneous abortions have occurred after exposure to life-threatening concentrations.
   Ingestion
Nausea and vomiting may be noted. Weight loss can be seen with chronic exposure.
   Inhalation
Respiratory depression, cyanosis, pulmonary edema, bronchitis, and dyspnea may be noted following exposure to non-fatal concentrations.
   Skin
Skin exposure may result in severe pain, itching, and erythema, especially in moist areas. Cyanosis may be noted following severe exposure.
   Eyes
See Skin.

First aid
 
   Ingestion
Hydrogen sulfide is a gas at room temperature (harbison, 1998), making ingestion unlikely.
   Inhalation
Immediately move patient to fresh air and administer 100 percent oxygen. Prevent self-exposure and possible death by wearing a self-contained breathing apparatus to rescue the victim.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
In case of contact with substance, immediately flush with running water for at least 20 minutes.

Transport.
UN number
2923, 2949
Response guide
Hazard class
8
Packing Group
I
 
USCG CHRIS Code
SHR
 
Std. Transport #
4935267 4935669
 
IMO Chemical Code
17
IMO Pollution Category
B
IMO Hazard code
S/P