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Chemical Weapons Convention
Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction
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Participation in the Chemical Weapons Convention
Drafted 3 September 1992
Signed 13 January 1993
Location Paris and New York
Effective 29 April 1997
Condition Ratification by 65 states
Signatories 165
Parties 193 (List of state parties)
Four UN states are not party: Egypt, Israel, North Korea and South Sudan.
Depositary UN Secretary-General
Languages Arabic, Chinese, English, French, Russian and Spanish

The Chemical Weapons Convention (CWC) is an arms control agreement which prohibits chemical weapons and chemical warfare. It is forbidden to make, store or use the weapons. Every country can become a part of it and most countries (188 in 2010) are. The full name is the Convention on the Prohibition of the Development, Production, Stockpiling and Use of Chemical Weapons and on their Destruction.

The Organization for the Prohibition of Chemical Weapons (abbreviated OPCW) is the international organization which organizes the discussions and decisions on the convention. It also checks if member states follow the rules by inspections.

As of August 2022 193 states have become parties to the CWC and accept its obligations. Israel has signed but not ratified the agreement, while three other UN member states (Egypt, North Korea and South Sudan) have neither signed nor acceded to the treaty. Most recently, the State of Palestine deposited its instrument of accession to the CWC on 17 May 2018. In September 2013, Syria acceded to the convention as part of an agreement for the destruction of Syria's chemical weapons.

As of February 2021, 98.39% of the world's declared chemical weapons stockpiles had been destroyed. The convention has provisions for systematic evaluation of chemical production facilities, as well as for investigations of allegations of use and production of chemical weapons based on the intelligence of other state parties.

Organisation for the Prohibition of Chemical Weapons (OPCW)

HQ of OPCW in The Hague
Headquarters in The Hague

The convention is administered by the Organisation for the Prohibition of Chemical Weapons (OPCW), which acts as the legal platform for specification of the CWC provisions. The Conference of the States Parties is mandated to change the CWC and pass regulations on the implementation of CWC requirements. The Technical Secretariat of the organization conducts inspections to ensure compliance of member states. These inspections target destruction facilities (where permanent monitoring takes place during destruction), chemical weapons production facilities which have been dismantled or converted for civil use, as well as inspections of the chemical industry. The Secretariat may furthermore conduct "investigations of alleged use" of chemical weapons and give assistance after use of chemical weapons.

The 2013 Nobel Peace Prize was awarded to the organization because it had, with the Chemical Weapons Convention, "defined the use of chemical weapons as a taboo under international law" according to Thorbjørn Jagland, Chairman of the Norwegian Nobel Committee.

Key points of the Convention

  • Prohibition of production and use of chemical weapons
  • Destruction (or monitored conversion to other functions) of chemical weapons production facilities
  • Destruction of all chemical weapons (including chemical weapons abandoned outside the state parties territory)
  • Assistance between State Parties and the OPCW in the case of use of chemical weapons
  • An OPCW inspection regime for the production of chemicals which might be converted to chemical weapons
  • International cooperation in the peaceful use of chemistry in relevant areas

Controlled substances

The convention distinguishes three classes of controlled substance, chemicals that can either be used as weapons themselves or used in the manufacture of weapons. The classification is based on the quantities of the substance produced commercially for legitimate purposes. Each class is split into Part A, which are chemicals that can be used directly as weapons, and Part B, which are chemicals useful in the manufacture of chemical weapons. Separate from the precursors, the convention defines toxic chemicals as "[a]ny chemical which through its chemical action on life processes can cause death, temporary incapacitation or permanent harm to humans or animals. This includes all such chemicals, regardless of their origin or of their method of production, and regardless of whether they are produced in facilities, in munitions or elsewhere."

  • Schedule 1 chemicals have few, or no uses outside chemical weapons. These may be produced or used for research, medical, pharmaceutical or chemical weapon defence testing purposes but production at sites producing more than 100 grams per year must be declared to the OPCW. A country is limited to possessing a maximum of 1 tonne of these materials. Examples are sulfur mustard and nerve agents, and substances which are solely used as precursor chemicals in their manufacture. A few of these chemicals have very small scale non-military applications, for example, milligram quantities of nitrogen mustard are used to treat certain cancers.
  • Schedule 2 chemicals have legitimate small-scale applications. Manufacture must be declared and there are restrictions on export to countries that are not CWC signatories. An example is thiodiglycol which can be used in the manufacture of mustard agents, but is also used as a solvent in inks.
  • Schedule 3 chemicals have large-scale uses apart from chemical weapons. Plants which manufacture more than 30 tonnes per year must be declared and can be inspected, and there are restrictions on export to countries which are not CWC signatories. Examples of these substances are phosgene (the most lethal chemical weapon employed in WWI), which has been used as a chemical weapon but which is also a precursor in the manufacture of many legitimate organic compounds (e.g. pharmaceutical agents and many common pesticides), and triethanolamine, used in the manufacture of nitrogen mustard but also commonly used in toiletries and detergents.

See also

Kids robot.svg In Spanish: Convención sobre Armas Químicas para niños

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