Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Toxic flame retardant accumulates in dolphins

14.04.2005


A team led by Dutch researcher Jan Boon from the Royal Netherlands Institute for Sea Research (Royal NIOZ) has discovered that one isomer of the toxic substance HBCD accumulates in dolphins and porpoises. The animals metabolise the other two isomers. HBCD has partially replaced other flame retardants already banned in Europe. However, according to the researchers it is still questionable whether HBCD is also less environmentally harmful. The results have just been published in the scientific journal ’Environmental Science & Technology’ (1 April 2005 issue).



HBCD, hexabromocyclododecane, is a much-used flame retardant in insulating foam and furniture upholstery. It disrupts the thyroid function and the functioning of the nervous system in mammals. The researchers only found the alpha isomer of HBCD in the blubber of porpoises and dolphins. Boon’s team were Bart Zegers from the Institute for Biodiversity and Ecosystem Dynamics (Universiteit van Amsterdam), Timo Hamers from the Institute for Environmental Studies (Vrije Universiteit Amsterdam) and Graham Pierce from the University of Aberdeen.

The porpoises and dolphins investigated were stranded on the coasts of Scotland, Ireland, the Netherlands, Belgium, France and northwest Spain. By far the most HBCD was found in the blubber of animals from the Irish Sea and the West Coast of Scotland. Therefore the researchers suspect that this HBCD originates from a source discharging into the Irish Sea.


The alpha isomer of HBCD forms at most fifteen percent of the HBCD formulation used in commercial flame retardants. The three isomers differ in how the bromine atoms are bound to the carbon atoms of HBCD and a new analytical technique can distinguish between the different isomers. Using this technique, Boon and his colleagues discovered that only the alpha isomer accumulates in sea mammals such as dolphins. They used liver material from laboratory rats and a recently dead seal washed up on a beach on Texel, the island off the Dutch coast where Royal NIOZ is located, to investigate the reason for these differences in bioaccumulation between the different HBCD isomers.

The beta and gamma isomers of HBCD are metabolised by the animals. The enzyme complex cytochrome P450 in the liver plays an important role in this. This complex adds oxygen to the HBCD but it cannot react with the alpha isomer. This is due to subtle differences in the spatial structure of the alpha, beta and gamma isomer molecules. As it is not metabolised, the alpha isomer accumulates in the fat-rich tissues of sea mammals, such as the blubber.

Dr Jan P. Boon | EurekAlert!
Further information:
http://www.nwo.nl

More articles from Life Sciences:

nachricht Bare bones: Making bones transparent
27.04.2017 | California Institute of Technology

nachricht Link Discovered between Immune System, Brain Structure and Memory
26.04.2017 | Universität Basel

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

Bare bones: Making bones transparent

27.04.2017 | Life Sciences

Study offers new theoretical approach to describing non-equilibrium phase transitions

27.04.2017 | Physics and Astronomy

From volcano's slope, NASA instrument looks sky high and to the future

27.04.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>