GA

  • Tabun
  • Dimethylamidoethoxyphosphoryl cyanide
  • Ethyl N,N-dimethylphosphoramidocyanidate
  • Phosphoramidocyanidic acid, dimethyl-, ethyl ester
Formula
C5H11N2O2P
Structure
Description
Colorless to brown liquid with a faint fruity odor.
Uses
Chemical warfare agent, military nerve gas. G series nerve agent.

Registry Numbers and Inventories.
CAS
77-81-6
RTECS
TB4550000
RTECS class
Drug; Human Data
UN (DOT)
2810
Merck
12,9196
Beilstein/Gmelin
1769395
Beilstein Reference
4-04-00-00275
Swiss Giftliste 1
G-2898
Canada DSL/NDSL
NDSL
US TSCA
Listed

Properties.
Formula
C5H11N2O2P
Formula mass
162.13
Melting point, °C
-50
Boiling point, °C
247
Vapor pressure, mmHg
0.04 (25 C)
Vapor density (air=1)
5.6
Density
1.077 g/cm3 (20 C)
Solubility in water
Very soluble
Refractive index
1.425 (20 C)
pKa/pKb
12.39 (pKb)
Partition coefficient, pKow
-1.16
Heat of vaporization
47.7 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
(Non-Specific -- Poison A, Liquid) When handling, avoid breathing vapors, keep upwind, avoid bodily contact with the material, and upon skin contact wash with soap and water. Speed in removing material from skin is of extreme importance. Remove and isolate contaminated clothing and shoes.
Stability
No data.
Incompatibilities
Can react with oxidizing materials.
Decomposition
When heated to decomposition, can emit highly toxic fumes of phosphorus oxides.

Fire.
Flash Point,°C
78
Fire fighting
Complete protection required; have available decontaminants (bleach, alkali) and atropine. Bleaching powder (chlorinated line) destroys Tabun but gives rise to cyanogen chloride.(Non-Specific -- Poison A, Liquid) Extinguish with alcohol foam, carbon dioxide, or dry chemical.
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
Muscarinic CNS effects of nerve agents include seizures, respiratory depression, mental status changes, fatigue, lethargy, agitation, depression, hallucinations, slurred speech, ataxia and headache.
   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. Effects begin to appear 0.5-2 minutes after exposure to vapor. The symptoms in normal order of appearance are running nose; tightness of chest; dimness of vision; drooling & excessive sweating; nausea, vomiting; cramps & involuntary defecation or urination; twitching, jerking, & staggering; & headache, confusion, drowsiness, coma, & convulsion. These symptoms are followed by cessation of breathing & death.
   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
 
USCG CHRIS Code
TBN