VX

  • Methylphosphonothioic acid S-[2-[bis(1-methylethyl)amino]ethyl] O-ethyl ester
  • O-Ethyl S-(2-diisopropylaminoethyl) methylphosphonothiolate
Formula
C11H26NO2PS
Structure
Description
liquid. Odorless.
Uses
Nerve gas, chemical warfare agent.

Registry Numbers and Inventories.
CAS
50782-69-9
RTECS
TB1090000
RTECS class
Drug; Reproductive Effector; Human Data
UN (DOT)
2810
Merck
12,10172
Beilstein/Gmelin
1949015
Canada DSL/NDSL
NDSL
US TSCA
Listed

Properties.
Formula
C11H26NO2PS
Formula mass
267.37
Melting point, °C
<-51
Boiling point, °C
300
Vapor pressure, mmHg
0.00035 (25 C)
Vapor density (air=1)
9.2
Density
1.0083 g/cm3
Solubility in water
30 g/L
pKa/pKb
4.22 (pKb)
Partition coefficient, pKow
2.02
Heat of vaporization
56.0 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
Decontaminants include bleach slurry and hot soapy water.
Stability
No data.

Fire.
Flash Point,°C
146
Fire fighting
Use protective clothing and respiratory protection.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
Highly toxic nitrogen oxides and sulfur oxides. Avoid extreme heat.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
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.
   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