Share

Biogeochemical Cycle of Mercury in Reservoir Systems in Wujiang River Basin, Southwest China

2017-11-09 Science
Download Biogeochemical Cycle of Mercury in Reservoir Systems in Wujiang River Basin, Southwest China PDF Online Free

Author :
Release : 2017-11-09
Genre : Science
Kind : eBook
Book Rating : 198/5 ( reviews)

GET EBOOK


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.

Human and Ecological Risk Assessment

2024-04-23 Technology & Engineering
Download Human and Ecological Risk Assessment PDF Online Free

Author :
Release : 2024-04-23
Genre : Technology & Engineering
Kind : eBook
Book Rating : 102/5 ( reviews)

GET EBOOK


Book Synopsis Human and Ecological Risk Assessment by : Dennis J. Paustenbach

Download or read book Human and Ecological Risk Assessment written by Dennis J. Paustenbach. This book was released on 2024-04-23. Available in PDF, EPUB and Kindle. Book excerpt: Understand the fundamentals of human risk assessment with this introduction and reference Human risk assessments are a precondition for virtually all industrial action or environmental regulation, all the more essential in a world where chemical and environmental hazards are becoming more abundant. These documents catalog potential environmental, toxicological, ecological, or other harms resulting from a particular hazard, from chemical spills to construction projects to dangerous workplaces. They turn on a number of variables, of which the most significant is the degree of human exposure to the hazardous agent or process. Human and Ecological Risk Assessment combines the virtues of a textbook and reference work to introduce and analyze these vital documents. Beginning with the foundational theory of human health risk assessment, it then supplies case studies and detailed analysis illustrating the practice of producing risk assessment documents. Fully updated and authored by leading authorities in the field, the result is an indispensable work. Readers of the second edition of Human and Ecological Risk Assessment will also find: Over 40 entirely new case studies reflecting the latest in risk assessment practice Detailed discussion of hazards including air emissions, contaminated food and soil, hazardous waste sites, and many more Case studies from multiple countries to reflect diverse international standards Human and Ecological Risk Assessment is ideal for professionals and advanced graduate students in toxicology, industrial hygiene, occupational medicine, environmental science, and all related subjects.

Global and Regional Mercury Cycles: Sources, Fluxes and Mass Balances

2012-12-06 Science
Download Global and Regional Mercury Cycles: Sources, Fluxes and Mass Balances PDF Online Free

Author :
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 805/5 ( reviews)

GET EBOOK


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.

Global Biogeochemical Cycling of Mercury

2009
Download Global Biogeochemical Cycling of Mercury PDF Online Free

Author :
Release : 2009
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


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.

Mercury in the Biogeochemical Cycle

2011-10-28 Science
Download Mercury in the Biogeochemical Cycle PDF Online Free

Author :
Release : 2011-10-28
Genre : Science
Kind : eBook
Book Rating : 821/5 ( reviews)

GET EBOOK


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 2011-10-28. 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.

You may also like...