1# Library to Find Best eBook for Read
Author : Marc Lucotte
Release : 1999-05-04
Genre :
Kind : eBook
Book Rating : 613/5 ( reviews)
Book Synopsis Mercury in the Biogeochemical Cycle by : Marc Lucotte
Download or read book Mercury in the Biogeochemical Cycle written by Marc Lucotte. This book was released on 1999-05-04. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Xinbin Feng
Release : 2017-11-09
Genre : Science
Kind : eBook
Book Rating : 198/5 ( reviews)
Book Synopsis Biogeochemical Cycle of Mercury in Reservoir Systems in Wujiang River Basin, Southwest China by : Xinbin Feng
Download or read book Biogeochemical Cycle of Mercury in Reservoir Systems in Wujiang River Basin, Southwest China written by Xinbin Feng. This book was released on 2017-11-09. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an intensive study on the biogeochemical cycle of mercury in a river-reservoir system in Wujiang River Basin, the upper branch of the Yangtze River. Six reservoirs located in the mainstream of the Wujiang River and their corresponding inflow/outflow rivers were selected for inclusion in this study, which was conducted by researchers from the Institute of Geochemistry, Chinese Academy of Sciences. The concentration and distribution of Hg in reservoirs (the water column, sediment, sediment pore water), inflow/outflow rivers of reservoirs, and wet deposition in Wujiang River Basin were systematically investigated, and measurements were taken of the water/air exchange flux of gaseous elemental mercury (GEM). On the basis of the data gathered, a detailed mass balance of total mercury (THg) and methylmercury (MeHg) in the six reservoirs was developed. In addition, the book identifies the primary factors controlling Hg methylation in the river-reservoir system in Wujiang River Basin. The accumulation and bio-magnification of Hg species within food chains in reservoirs and human health risk of MeHg exposure through fish consumption are also included in this book.
Author : W. Baeyens
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 805/5 ( reviews)
Book Synopsis Global and Regional Mercury Cycles: Sources, Fluxes and Mass Balances by : W. Baeyens
Download or read book Global and Regional Mercury Cycles: Sources, Fluxes and Mass Balances written by W. Baeyens. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: Essential themes in the biochemical cycling of mercury are the relative importance of anthropogenic versus natural sources, transformation and migration processes at the local, regional and global scale, global emission inventories of different mercury sources (both point and diffuse) of both natural and anthropogenic origin. In this regard, Siberia, with its vast territory and variety of natural zones, is of special interest in the global mercury cycle and in terms of the influence of geographical zones on source and sink terms in regional budgets. Siberia contains large areas of mercuriferous belts; natural deposits that emit mercury into the atmosphere and water. Siberian gold has been mined with the use of mercury since the early 1800s. But there, too, huge forest zones and vast areas of tundra and wetland (bogs) can act as efficient sinks for atmospheric mercury. Audience: Environmental scientists, legislators, politicians and the interested citizen wishing to gain a clear picture of the biogeochemical cycling of mercury.
Author : Marc Marcotte
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 60X/5 ( reviews)
Book Synopsis Mercury in the Biogeochemical Cycle by : Marc Marcotte
Download or read book Mercury in the Biogeochemical Cycle written by Marc Marcotte. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, major environmental issues are the object of large public debates de spite the fact that scientific knowledge is often insufficient to draw unequivocal conclusions. Such is the case in the ongoing debate regarding the specific contri butions of anthropogenic greenhouse gas emissions and of natural climate changes to global warming. At least 10 to 20 years of additional observations will be re quired, before we will be able to conclude, with certainty, on this subject. In the mean time, and as directed by their immediate interests, people will continue to promote contradictory opinions. The media are, in part, responsible for perpetuat ing such debates in that they convey indiscriminately the opinion of highly credi ble scientists as that of dogmatic researchers, the latter, unfortunately too often expressing working hypotheses as established facts. Naturally, in a similarly mis informed manner, pressure groups tend to support the researcher whose opinions most closely represent either their particular ideological battles or their economic interests and, hence, in their own way, add further to the confusion and obscurity of the debate. Only a few years ago, mercury (Hg)contamination in hydroelectric reservoirs was the object of such media and social biases. At the time, analytical data used to support the discourse were themselves uncertain and numerous hypotheses, often times fanciful, were proposed and hastily "delivered" to the public.
Author : Noelle Eckley Selin
Release : 2009
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Global Biogeochemical Cycling of Mercury by : Noelle Eckley Selin
Download or read book Global Biogeochemical Cycling of Mercury written by Noelle Eckley Selin. This book was released on 2009. Available in PDF, EPUB and Kindle. Book excerpt: Mercury pollution poses global human health and environmental risks. Although mercury is naturally present in the environment, human activities, such as coal burning, have increased the amount of mercury cycling among the land, atmosphere, and ocean by a factor of three to five. Emitted to the atmosphere in its elemental form, mercury travels worldwide before oxidizing to a form that deposits to ecosystems. In aquatic systems, mercury can convert into methylmercury, a potent neurotoxin. People and wildlife are exposed to methylmercury as it bioaccumulates up the food chain. Mercury continues to circulate in the atmosphere, oceans, and terrestrial system for centuries to millennia before it returns to deep-ocean sediments. Areas of uncertainty in the global biogeochemical cycle of mercury include oxidation processes in the atmosphere, land-atmosphere and ocean-atmosphere cycling, and methylation processes in the ocean. National and international policies have addressed direct mercury emissions, but further efforts to reduce risks face numerous political and technical challenges.
