Soman

  • GD (NATO military designation)
  • 1,2,2-Trimethylpropyl methylphosphonofluoridate
  • Pinacolyl methylphosphonofluoridate
Formula
C7H16FO2P
Structure
Description
Colorless liquid. Odorless.
Uses
Chemical warfare agent. G series nerve agent.

Registry Numbers and Inventories.
CAS
96-64-0
RTECS
TA8750000
RTECS class
Drug; Mutagen; Human Data
UN (DOT)
2810
Merck
12,8860
Beilstein/Gmelin
1928737
Swiss Giftliste 1
G-1636

Properties.
Formula
C7H16FO2P
Formula mass
182.18
Melting point, °C
-42
Boiling point, °C
167
Vapor pressure, mmHg
0.44 (25 C)
Vapor density (air=1)
6
Density
1.022 g/cm3
Solubility in water
2.1 g/L
Partition coefficient, pKow
1.778
Heat of vaporization
42.0 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
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
ELIMINATE all ignition sources. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
No data.
Incompatibilities
Most of the G series nerve agents decompose slowly in water. Raising the pH increases the rate of decomposition significantly. Reaction with dry bleach may produce toxic gases.
Decomposition
When heated to decomposition, can emit highly toxic fumes of phosphorus oxides.

Fire.
Flash Point,°C
75
Fire fighting
Small Fires: Dry chemical, carbon dioxide or water spray. Large Fires: Dry chemical, carbon dioxide, alcohol-resistant foam or water spray.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
1
Exposure effects
Effects from vapor exposure begin to appear 30 seconds to 2 minutes after exposure. For liquids, there is almost always a latent period with no visible effects between the time of exposure and the onset of symptoms. Effects from liquid exposure begin to appear from several minutes up to 18 hours after exposure. Onset of symptoms from exposure to large amounts of liquid agent may appear as rapidly as I minute after exposure. Generally, the more rapid the onset of symptoms, the larger the amount of agent involved in the exposure.
   Ingestion
See Inhalation.
   Inhalation
TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Effects of contact or inhalation may be delayed.
   Skin
Sweating is a common muscarinic effect of nerve agent exposure.
   Eyes
Constriction of the pupil, tearing, and blurred or dim vision are common clinical findings. Occasionally prolonged dialation of the pupils may occur in severe poisonings. Excessive salivation commonly occurs.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Nerve agent vapors are heavier than air, which means that they will sink into low terrain and basements. Monitor ecg and adequacy of respirations and ventilation; supplemental oxygenation, frequent suctioning of secretions, endotracheal intubation, and assisted ventilation may be required.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
2810
Response guide
Hazard class
6.1
PRTC
T
Packing Group
I; II; III