Polychlorinated Napththalenes (PCN) and Hexachlorobutadiene (HCBD) recommended for inclusion in the Stockholm Convention


Two industrial chemicals, Polychlorinated Napththalenes (PCN) and Hexachlorobutadiene (HCBD) have been recommended for inclusion in the Stockholm Convention on Persistent Organics Pollutants (POPs). This recommendation has been made by the POPs Review Committee, a Structure of Polychlorinated Napththalenessubsidiary body of the Stockholm Convention on POPs. If this recommendation if eventually ratified, PCN and HCBD are marked for eventual phase-out.

PCN products are formed by chemically reacting chlorine and naphthalene (a substance from coal or petroleum distillation). PCNs were used widely for several years for the commercial production of wood preservatives, rubber and plastic additives, insulating coatings for electrical wires, capacitor dielectrics and lubricants.  HCBDs were used extensively in industrial Structure of Hexachlorobutadieneprocesses and as fumigant in pest control. PCN have been found to cause severe skin rashes and liver disease leading to death in some cases while HCBD is carcinogenic.

The recommendations will be sent to the Parties to the Stockholm Convention for consideration at the seventh meeting of the Conference of the Parties, scheduled to be held from 4 to 15 May 2015 in Geneva. Both chemicals have been recommended for listing in Annexes A and C to the Convention, thus targeting their intentional production, as well as unintentional releases of the chemicals.

The following twelve persistent organic pollutants had been recommended previously to the Conference of the Parties by the POPs Review Committee and have now been added to the Convention:

  • Alpha hexachlorocyclohexane
  • Beta hexachlorocyclohexane
  • Chlordecone
  • Hexabromobiphenyl
  • Hexabromocyclododecane
  • Hexabromodiphenyl ether and heptabromodiphenyl ether (commercial octabromodiphenyl ether)
  • Endosulfan
  • Lindane
  • Pentachlorobenzene
  • Perfluorooctane sulfonic acid, its salts and perfluorooctane sulfonyl fluoride
  • Technical endosulfan and its related isomers
  • Tetrabromodiphenyl ether and pentabromodiphenyl ether (commercial pentabromodiphenyl ether)

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