UNEP-POPS-POPRC.4-INF-12.English.DOC - SC UNEP\/POPS\/POPRC.4\/INF\/12 Distr General 15 July 2008 Stockholm Convention on Persistent Organic Pollutants

UNEP-POPS-POPRC.4-INF-12.English.DOC - SC...

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SC UNEP /POPS/POPRC.4/INF/12 Stockholm Convention on Persistent Organic Pollutants Distr.: General 15 July 2008 English, French and Spanish only Persistent Organic Pollutants Review Committee Fourth meeting Geneva, 13–17 October 2008 Item 6 (b) of the provisional agenda * Issues relating to risk profiles: consideration of reductive debromination of bromo-aromatics Reductive debromination of bromo-aromatics Note by the Secretariat 1. At its second and third meetings, the Committee reviewed the risk profile and risk management evaluation respectively for commercial pentabromodiphenyl ether. It decided to recommend that the Conference of the Parties consider listing in Annex A of the Stockholm Convention 2,2',4,4'-tetrabromodiphenyl ether (BDE-47, CAS No. 40088-47-9) and 2,2',4,4',5-pentabromodiphenyl ether (BDE-99, CAS No. 32534-81-9) and other tetra- and pentabromodiphenyl ethers present in commercial pentabromodiphenyl ether, using BDE-47 and BDE-99 as markers for enforcement purposes. 1 2. The Committee also agreed that an information document would be prepared to assist the Conference of the Parties in its deliberations on how best to list commercial pentabromodiphenyl ether in the annexes of the Convention. 3. Accordingly, Mr. Ian D. Rae (Australia), chair of the intersessional working group on pentabromodiphenyl ether, prepared a draft information document. That document is contained in the annex to the present note and has not been formally edited by the Secretariat. * UNEP/POPS/POPRC.4/1. 1 UNEP/POPS/POPRC.3/20, para 49. K0841246 010908 For reasons of economy, this document is printed in a limited number. Delegates are kindly requested to bring their copies to meetings and not to request additional copies.
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UNEP/POPS/POPRC.4/INF/12 Annex Reductive debromination of bromo-aromatics TABLE OF CONTENTS 1. Introduction ................................................................................................................................................................ 3 2. Laboratory chemistry ................................................................................................................................................. 3 3. Modification of polybromodiphenyl ethers in the environment ................................................................................ 4 3.1 Information from the c-PentaBDE Annex E statement .................................................................................... 4 3.2 Information from the c-OctaBDE Annex E Risk Profile .................................................................................. 4 3.3 More recent or overlooked references .............................................................................................................. 5 4. Photodecomposition ................................................................................................................................................... 5 5. Comparison with reductive dechlorination of polychlorobiphenyls .......................................................................... 6 6. Conclusions ................................................................................................................................................................ 7 7. References .................................................................................................................................................................. 7 2
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UNEP/POPS/POPRC.4/INF/12 1. Introduction 1. A number of polybromodiphenyl ethers have been produced commercially and widely used as flame retardants over the last 50 years, usually as components of commercial mixtures. The work of the Persistent Organic Pollutants Review Committee (POPRC) over the past three years has established that polybromodiphenyl ethers with four, five, six or seven bromine substitutents meet the criteria of the Stockholm Convention for Persistent Organic Pollutants (POPs). In 2009, the Conference of the Parties will consider the addition of these substances, or mixtures containing them, to the list of banned or restricted substances.
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