Tabun


Tabun
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Discovery
Discovered byGerhard Schrader
Discovered in 1936
Chemical characteristics
Chemical name Ethyl N,N-dimethylphosphoramidocyanidate
Chemical familyOrganophosphorous compound
Chemical formula C5H11N202P
NFPA Rating
  • Health - 4
  • Flammability - 2
  • Reactivity - 1
Boiling point 247.5 °C (477.5 °F)
Freezing/melting point -50 °C (-122 °F)
Vapor pressure 0.07 mmHg (9 Pa) at 25 °C
Vapor density (Air=1) 5.6
Liquid density 1.0887 at 25 °C/1.102 at 20 °C
Solubility in water 9.8 g/100 g at 25 °C / 7.2 g/100 g at 20 °C
Specific gravity Not available
Appearance and color Colorless to brown liquid.
Faintly fruity odor (none when pure)
Fire and Explosion Data
Flashpoint 78 °C (172.4 °F)
Unusual hazards Fires involving this chemical may result
in the formation of hydrogen cyanide
Tabun or GA (Ethyl N,N-dimethylphosphoramidocyanidate) is an extremely toxic substance that is one of the world's most dangerous weapons of war. Because it fatally interferes with normal functioning of the mammalian nervous system, it is classified as a nerve agent. As a chemical weapon, it is classified as a weapon of mass destruction by the United Nations according to UN Resolution 687, and its production and stockpiling was outlawed by the Chemical Weapons Convention of 1993. Tabun is the first of the so-called G-series nerve agents (along with GB (sarin), GD (soman) and GF (cyclosarin)). Tabun is a colourless to brown liquid (depending on purity) It is volatile (evaporating readily at normal temperatures), although less volatile than either sarin or soman. Although odorless when pure, tabun is commonly described as having a faint fruity odor due to common manufacturing impurities.

Effects of overexposure

The exact symptoms of overexposure are similar to those created by all nerve agents, and are described in more detail in that article. Tabun, like all nerve agents, is toxic even in minute doses. The number and severity of symptoms which appear vary according to the amount of the agent absorbed and rate of entry into the body. Very small skin dosages sometimes cause local sweating and tremors with few other effects. Tabun is about half as toxic as sarin by inhalation, but tabun in very low concentrations is more irritating to the eyes than sarin. The effects of exposure appear much more slowly when tabun is absorbed through the skin rather than inhaled: although a victim may absorb a lethal dose in 1 to 2 minutes, death may be delayed for 1 to 2 hours. Inhaled lethal dosages kill in 1 to 10 minutes, and liquid in the eye kills almost as rapidly. Most of what is known about lethal dosages are known from animal studies on monkeys.

Alternative names

Tabun is occasionally referred to names other than tabun or GA:

History

center
This article forms part of the series
Chemical Warfare
(A subset of Weapons of Mass Destruction)
Lethal Agents
Blood Agents
Cyanogen chloride
Hydrogen cyanide
Blister Agents
Lewisite
Sulfur Mustard Gas (HD and THD, HT)
Nerve Agents
G-Agents
GA (tabun), GB (sarin)
GD (soman), GF (cyclosarin)
V-Agents
VE, VG, VM, VX
Pulmonary Agents
Chlorine
Phosgene
Diphosgene
Non-lethal Agents
Incapacitating Agents
BZ / Agent 15
Riot Control Agents
Pepper spray
Tear Gas
:''For an in-depth discussion, see main article on nerve agent history'' Tabun, the first known nerve agent, was discovered accidentally in 1936 by the German researcher Dr. Gerhard Schrader. Dr. Schrader was experimenting with a class of compounds called organophosphates, which kills insects by interrupting their nervous systems, in order to create a more effective insecticide for the IG Farben pharmaceutical conglomerate at Elberfield. Instead of a new insecticide, however, he accidentally discovered tabun, an enormously toxic organophosphate compound still sometimes stockpiled today as a nerve agent. During World War II as part of the Grün 3 program, a plant for the manufacture of tabun was established in Dyhernfurth (now Brzeg Dolny, Poland), producing the nerve agent under the codename Trilon-83. Run by Anorgana GmbH, the plant began production in 1942. With early manufacturing problems, only around 12,500 tons of material were manufactured before the plant was over-run by the advancing Soviet forces. The plant produced shells using a 95:5 or 80:20 mix of tabun and chlorobenzene. The Soviet government had the plant dismantled and taken back to Russia. Like the other Allied governments, the Soviets soon abandoned GA for GB and GD. Large quantities of the German-manufactured agent were dumped into the sea. However, GA is much easier to create than the other G-series chemicals and the process is comparatively well known, as such states with less advanced industrial capabilities often start a nerve agent program with GA. During the Iran-Iraq War, both sides employed large quantities of chemical weapons against ground forces. The agents most used were mustard gas and sarin, but tabun and cyclosarin were also used.

See also

References

de:Tabun nl:Tabun ja:タブン pl:Tabun sv:Tabun Category:Anticholinesterases Category:Chemical weapons Category:Amides Category:Nitriles Category:Phosphonates

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