M687
Encyclopedia
Binary chemical weapon
Binary chemical weapons or munitions are chemical weapons wherein the toxic agent is not contained within the weapon in its active state, but in the form of two chemical precursors, physically separated within the weapon...
sarin
Sarin
Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...
chemical weapon artillery
Artillery
Originally applied to any group of infantry primarily armed with projectile weapons, artillery has over time become limited in meaning to refer only to those engines of war that operate by projection of munitions far beyond the range of effect of personal weapons...
shell
Shell (projectile)
A shell is a payload-carrying projectile, which, as opposed to shot, contains an explosive or other filling, though modern usage sometimes includes large solid projectiles properly termed shot . Solid shot may contain a pyrotechnic compound if a tracer or spotting charge is used...
. The design was standardized in 1976 and production began on December 16, 1987 at Pine Bluff Arsenal
Pine Bluff Arsenal
The Pine Bluff Arsenal is a US Army installation located in Jefferson County, Arkansas, just northwest of the city of Pine Bluff. PBA is one of the six Army installations in the United States that store chemical weapons...
, Pine Bluff, Arkansas
Pine Bluff, Arkansas
Pine Bluff is the largest city and county seat of Jefferson County, Arkansas, United States. It is also the principal city of the Pine Bluff Metropolitan Statistical Area and part of the Little Rock-North Little Rock-Pine Bluff, Arkansas Combined Statistical Area...
. Production was halted three years later, following a June 1990 chemical weapon destruction treaty with Russia, and the dismantling of existing stocks began in November 1997 at Hawthorne Army Depot
Hawthorne Army Depot
Hawthorne Army Depot is a U.S. Army ammunition storage site located near the town of Hawthorne in western Nevada in the United States. It is directly south of Walker Lake. The depot covers and has storage space in 2,427 bunkers...
, Nevada. America's remaining stocks were stored at the Deseret Chemical Depot
Deseret Chemical Depot
The Deseret Chemical Depot is a U.S. Army chemical weapon storage area located in Utah, 60 miles southwest of Salt Lake City. It is related to the Tooele Chemical Agent Disposal Facility.-History:...
, Utah, and the Umatilla Chemical Depot
Umatilla Chemical Depot
The Umatilla Chemical Depot, based in Umatilla, Oregon, was a U.S. Army installations in the United States that stored chemical weapons. The chemical weapons originally stored at the depot consisted of various munitions and ton containers containing GB and VX nerve agents and HD blister agent...
(Umatilla County, Oregon
Umatilla County, Oregon
Umatilla County is a county located in the U.S. state of Oregon. It is included in the 8 county definition of Eastern Oregon. The county is named for the Umatilla River. In 2010, its population was 75,889...
).
The shell contained two canisters separated by a rupture disk. The compartments were filled with two liquid precursor chemicals for sarin
Sarin
Sarin, or GB, is an organophosphorus compound with the formula [2CHO]CH3PF. It is a colorless, odorless liquid, which is used as a chemical weapon. It has been classified as a weapon of mass destruction in UN Resolution 687...
(GB2): methylphosphonyl difluoride
Methylphosphonyl difluoride
Methylphosphonyl difluoride , also called methyl difluorophosphite, methylphosphonic difluoride, and difluoromethylphosphine oxide, is a chemical weapon precursor. It is a Schedule 1 substance in the sense of the Chemical Weapons Convention...
(denominated DF) and a mixture of isopropyl alcohol and isopropyl amine (denominated OPA) is in a second canister. The isopropyl amine binds the hydrogen fluoride
Hydrogen fluoride
Hydrogen fluoride is a chemical compound with the formula HF. This colorless gas is the principal industrial source of fluorine, often in the aqueous form as hydrofluoric acid, and thus is the precursor to many important compounds including pharmaceuticals and polymers . HF is widely used in the...
generated during the chemical reaction. When the shell was fired the force of the acceleration would cause the disk between them to breach and the spinning of the projectile facilitated mixing. The two precursor chemicals would react in flight to produce sarin and when the shell reached its target the sarin would be released.
The shells were meant to be stored and transported with only the OPA compartment loaded; the fuse and the DF compartment would be inserted shortly before firing.
The M687 was never used in combat and, under the Chemical Weapons Convention
Chemical Weapons Convention
The Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...
, the U.S. destroyed the shells and the precursor chemical DF as part of its agreement to eliminate all chemical weapons. More than 258,000 of the shells were shipped to Hawthorne Army Depot
Hawthorne Army Depot
Hawthorne Army Depot is a U.S. Army ammunition storage site located near the town of Hawthorne in western Nevada in the United States. It is directly south of Walker Lake. The depot covers and has storage space in 2,427 bunkers...
from their storage at Deseret Chemical Depot
Deseret Chemical Depot
The Deseret Chemical Depot is a U.S. Army chemical weapon storage area located in Utah, 60 miles southwest of Salt Lake City. It is related to the Tooele Chemical Agent Disposal Facility.-History:...
, Utah, and the Umatilla Chemical Depot
Umatilla Chemical Depot
The Umatilla Chemical Depot, based in Umatilla, Oregon, was a U.S. Army installations in the United States that stored chemical weapons. The chemical weapons originally stored at the depot consisted of various munitions and ton containers containing GB and VX nerve agents and HD blister agent...
, Oregon and were destroyed by July 1999. The last of the U.S.'s stockpile of DF was destroyed on April 6, 2006.
See also
- Chemical Weapons ConventionChemical Weapons ConventionThe Chemical Weapons Convention is an arms control agreement which outlaws the production, stockpiling and use of chemical weapons. Its full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction...
- M110 155mm Projectile
- M121/A1 155mm Projectile
- M104 155mm Proectile
- M55 rocketM55 rocketThe M55 rocket was a chemical weapon developed by the United States in the 1950s. The United States Army produced both Sarin and VX unitary warheads for the M55.-History:...
- United States and weapons of mass destructionUnited States and weapons of mass destructionThe United States is known to have possessed three types of weapons of mass destruction: nuclear weapons, chemical weapons and biological weapons. The U.S. is the only country to have used nuclear weapons in combat. The U.S. also used chemical weapons in World War I...