The researchers, Prof. Menachem Luria from the Fredy and Nadine Herrmann Institute of Earth Sciences at the Hebrew University and Dr. Daniel Obrist of the University of Nevada, found that “passive” mercury normally found in the atmosphere is converted into an “active,” oxidized form in the presence of bromine. The passive mercury is generally non-transferable, whereas the active form is readily absorbed into the environment.
The air over the Dead Sea was chosen for the experiments on mercury oxidation – even though it does not contain any fish – since it has unusually high levels of bromine that is emitted from the surface into the atmosphere, converting the mercury there into the oxidized mercury.
“In the world generally, the amount of oxidized mercury in the atmosphere constitutes about one percent of all the mercury in the atmosphere,” said Prof. Luria, “while above the Dead Sea the oxidized mercury often amounts up to about 50 percent.”
In fact, the bromine in the air over the Dead Sea is 200 times greater than over other bodies of water, say the researchers, due not only to the high level of bromine present on the surface but also to the high rate of its evaporation into the atmosphere because of the very high temperatures there. It is important to note, they emphasize, that this process of conversion of passive into active mercury occurs over all bodies of water, even though it may be at much lower levels than at the Dead Sea.
Although health officials in the world have issued warnings from time to time about the danger of mercury found in fish, the process by which the inactive mercury is converted into the active, oxidized form was previously unknown. The current research has now revealed how this occurs, with the resultant introduction of this dangerous, active form of mercury into the fish food chain and ultimately into humans through the consumption of sea food.
The research by Prof. Luria and Obrist was supported by the National Science Foundation of the US, and the results were published in Nature Geoscience Journal. This is the latest of numerous research projects conducted in the Dead Sea area, which serves as a natural laboratory for a long list of biological-chemical and geophysical research projects, commented Prof. Luria.
Jerry Barach | Hebrew University
Millions through license revenues
27.04.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn
New High-Performance Center Translational Medical Engineering
26.04.2017 | Fraunhofer ITEM
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...
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...
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...
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...
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...
28.04.2017 | Event News
20.04.2017 | Event News
18.04.2017 | Event News
28.04.2017 | Medical Engineering
28.04.2017 | Earth Sciences
28.04.2017 | Life Sciences