Ammonium sulfide solution

  • Diammonium sulfide
  • Ammonium monosulfide
  • True ammonium sulfide
Formula
(NH4)2S
Structure
Description
Aqueous solutions of diammonium sulfide. Amounts range from 20 -52%. Clear, yellow liquid with a strong odor of ammonia and sulfide.
Uses
To apply patina to bronze, & in trace metal analysis.

Registry Numbers and Inventories.
CAS
12135-76-1
EC (EINECS/ELINCS)
235-223-4
R 10 23/25 31 34 50
S 26 36/37/39 45 61
RTECS
BS4920000
UN (DOT)
2683
Merck
13,560
Beilstein/Gmelin
23925 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
H8N2S
Formula mass
68.13
Melting point, °C
-18
Boiling point, °C
Decomposes
Vapor pressure, mmHg
450
Vapor density (air=1)
2.3
Density
0.99 g/cm3
Solubility in water
Very soluble
pKa/pKb
7.08 (pKb)

Hazards and Protection.
Storage
Protect against physical damage. Outside or detached storage is preferred. Inside storage should be a standard flammable liquids storage room or cabinet.
B3 D1B E
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
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Make no contact with the spilled material. Fully encapsulating, vapor protective clothing should be worn for spills and leaks with no fire. ELIMINATE all ignition sources and ground all equipment. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material.
Stability
Stable under ordinary conditions of use and storage. May lose integrity with age; ammonium sulfide slowly produces hydrogen sulfide and ammonia in the presence of moisture.
Incompatibilities
Contact with strong oxidizers may cause fire. Incompatible with alkalies, strong acids, copper, brass, bronze, strong bases, zinc and aluminum.
Decomposition
Emits toxic fumes of sulfur oxides, nitrogen oxides, hydrogen sulfide, ammonium bisulfite, and ammonia when heated to decomposition.

Fire.
Flash Point,°C
22
Upper exp. limit, %
46
Lower exp. limit, %
4
Fire fighting
Wear full protective clothing and NIOSH-approved self-contained breathing apparatus with full facepiece operated in the pressure demand or other positive pressure mode. Use water in flooding quantities as fog; solid streams of water may be ineffective to knock down vapors. DO NOT USE CARBON DIOXIDE AS FLAMMABLE, TOXIC HYDROGEN SULFIDE GAS CAN BE GENERATED. Apply water from as far a distance as possible. Alcohol foam or dry chemical may be used.
Fire potential
Moderate when exposed to flame.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
3
 
 
Reactivity
0
 

Health.
Exposure effects
Chronic exposure may cause damage to exposed tissues.
   Ingestion
May be corrosive to the gastrointestinal tract through liberation of hydrogen sulfide. Can cause nausea, vomiting, headache, cyanosis, respiratory depression, blood pressure fall, unconsciousness, tremors, convulsions, and death.
   Inhalation
Inhalation of vapors causes irritation to the respiratory tract; symptoms may include coughing and shortness of breath. Concentrations of hydrogen sulfide above 50 ppm may cause headache, insomnia, nausea, sore throat, dizziness, drowsiness, and pulmonary edema. Above 600 ppm for 30 minutes can cause death.
   Skin
Severe skin irritation and/or burns may occur.
   Eyes
See Skin.

First aid
 
   Ingestion
If swallowed, DO NOT INDUCE VOMITING. Give large quantities of water. Never give anything by mouth to an unconscious person. Get medical attention immediately.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush with running water for at least 20 minutes. Wash skin with soap and water.
   Eyes
In case of contact with substance, immediately flush with running water for at least 20 minutes.

Transport.
UN number
2683
Response guide
Hazard class
8
Packing Group
II
 
USCG CHRIS Code
ASF
 
Std. Transport #
4936343
 
IMO Chemical Code
17
IMO Pollution Category
B
IMO Hazard code
S/P