Difference between revisions of "Tetrabromobisphenol A"
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It's is a very persistent substance. It's also very difficult to be biodegraded in aerobic conditions, while it's still rather unknown whether it degrades in anaerobic conditions: it has been suggested that under anaerobic conditions TBBT-A may be biodegraded to [[bisphenol-A]]. <P> | It's is a very persistent substance. It's also very difficult to be biodegraded in aerobic conditions, while it's still rather unknown whether it degrades in anaerobic conditions: it has been suggested that under anaerobic conditions TBBT-A may be biodegraded to [[bisphenol-A]]. <P> | ||
TBBP-A is a toxic substance as concentrations above 2,6 µg/l might already cause problems at chronic exposure for marine invertebrates. Such concentrations might already impair the shell growth of a [[species]] of oysters. Fresh water invertebrates and fish have a higher tolerance, concentrations of 0,12 and 0,16 mg/l respectively are necessary to cause effects. | TBBP-A is a toxic substance as concentrations above 2,6 µg/l might already cause problems at chronic exposure for marine invertebrates. Such concentrations might already impair the shell growth of a [[species]] of oysters. Fresh water invertebrates and fish have a higher tolerance, concentrations of 0,12 and 0,16 mg/l respectively are necessary to cause effects. | ||
| − | Present marine concentrations are considered to be of little risk to [[biota]], however concern is raised about the possible degradation to biphenol-A, of which low concentrations have been shown to affect the [[endocrine system]] | + | Present marine concentrations are considered to be of little risk to [[biota]], however concern is raised about the possible degradation to biphenol-A, of which low concentrations have been shown to affect the [[endocrine system]]<ref name="Ospar">[http://www.ospar.org/documents%5Cdbase%5Cpublications%5Cp00202_BD%20on%20TBBPA.pdf OSPAR Commission, 2005: OSPAR background document on tetrabromobisphenol-A]</ref>. |
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Revision as of 11:26, 31 August 2009
Definition of tetrabromobisphenol–A(TBBP-A):
Tetrabromobisphenol–A is a brominated organic compound. It's primary used as an intermediate in the production of flame retardants like PBDEs, but can also be used as a flame retardant itself[1].
This is the common definition for tetrabromobisphenol–A(TBBP-A), other definitions can be discussed in the article
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Notes
| tetrabromobisphenol–A |
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| Formula |
| C15H12Br4O2 |
Tetrabromobisphenol-A is produced in the USA, Israel and Japan but not in the EU. Current production is estimated between 120.000 and 150.000 ton each year, of which approximately 40.000 ton is each year exported to the European Union.
Tetrabromobisphenol-A is likely to reach the marine environment largely through industrial waste waters from land-based industrial activities. A small contribution may come from releases to the water from losses from products which contain the substance[1].
There is currently no information on levels of tetrabromobisphenol-A in marine waters, but there are measurements in estuarine sediments and in North Sea biota. Concentrations in the Scheldt estuary sediments range between 0,1 and 32 µg/kg wet weight. Concentrations in North Sea biota can reach up to 245 µg/kg wet weight in whiting fillet.
Tetrabromobisphenol-A is considered to have a moderate tendency towards bioaccumulation.
It's is a very persistent substance. It's also very difficult to be biodegraded in aerobic conditions, while it's still rather unknown whether it degrades in anaerobic conditions: it has been suggested that under anaerobic conditions TBBT-A may be biodegraded to bisphenol-A.TBBP-A is a toxic substance as concentrations above 2,6 µg/l might already cause problems at chronic exposure for marine invertebrates. Such concentrations might already impair the shell growth of a species of oysters. Fresh water invertebrates and fish have a higher tolerance, concentrations of 0,12 and 0,16 mg/l respectively are necessary to cause effects. Present marine concentrations are considered to be of little risk to biota, however concern is raised about the possible degradation to biphenol-A, of which low concentrations have been shown to affect the endocrine system[1].
Environmental standards and legislation
Included in the OSPAR list of substances of priority action
See also
Tetrabromobisphenol-A on ED North Database
OSPAR background document on cadmium
