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Author : Ryan Lepak
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (93 download)
Download or read book New Insights to Mercury Cycling in the Great Lakes written by Ryan Lepak and published by . This book was released on 2014 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cristal Fernández Gómez
Publisher :
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.:/5 (898 download)
Download or read book New Insights on the Biogeochemical Cycle of Mercury in Freshwater Environments written by Cristal Fernández Gómez and published by . This book was released on 2014 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: En aquesta tesi doctoral s'aborden dos aspectes relacionats amb al cicle biogeoquímic del Hg en aigües continentals. Per una banda, es va desenvolupar un sistema de mostreig passiu denominat gradients de difusió en capa fina (DGT), per la determinació del Hg total i del MeHg en fase aquosa. Aquests mostrejadors proporcionen la concentració mitjana de Hg durant el temps de mostreig i mesuren la fracció làbil de Hg. Per tant, la tècnica de DGT pot ser considerada una bona eina per avaluar la biodisponibilitat de Hg a l'aigua. D'altra banda, es va estudiar la fotodegradació de MeHg en aigües continentals. Pel que fa a la tècnica DGT, es van dur a terme diverses proves preliminars tant al laboratori com en el camp per provar la validesa d'un tipus comercial de mostrejador per mesurar el Hg dissolt i col·loidal làbil en aigua dolça. Aquest es va comparar amb dos tipus de mostrejadors DGT manufacturats al laboratori (A-DGT i P-DGT). Es van estudiar les cinètiques d'acumulació de Hg(II) i MeHg tant en absència com en presència de DOM. El P-DGT va ser escollit com el més apropiat per determinar ambdós THg i MeHg en aigües naturals i va ser utilitzat en un estudi de cas per avaluar l'eliminació, metilació i labilitat de Hg(II) en una aiguamoll construït a escala experimental pel tractament d'aigües residuals urbanes. La fotodegradació de MeHg va ser estudiada en aigües d'un gradient llac-aiguamoll en la Suècia boreal; i es va evaluar la influència de DOM en el procés. Es va observar que la constant de velocitat de fotodesmetilació (kpd Full Spectrum) va variar significativament entre les aigües estudiades, però les constants específiques per a cada longitud d'ona (kpdPAR, kpdUVA and kpdUVB) van ser indistingibles. Per això, kpdPAR, kpdUVA and kpdUVB poden ser considerades universals en aigües amb un alt contingut en DOM i on el MeHg estigui complexat per grups tiol orgànics. Finalment, amb la utilització de la tècnica DGT es va estudiar la possible influència que pot existir entre la fotodegradació i la biodisponibilitat de MeHg en diversos tipus d'aigues dolces naturals i artificials, però no es va observar cap connexió aparent entre elles.
Author :
Publisher : Newnes
ISBN 13 : 0080977677
Total Pages : 569 pages
Book Rating : 4.0/5 (89 download)
Download or read book Alberta Oil Sands written by and published by Newnes. This book was released on 2012-11-07 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: At 170 billion barrels, Canada's Oil Sands are the third largest reserves of developable oil in the world. The Oil Sands now produce about 1.6 million barrels per day, with production expected to double by 2025 to about 3.7 million barrels per day. The Athabasca Oil Sands Region (AOSR) in northeastern Alberta is the largest of the three oil sands deposits. Bitumen in the oil sands is recovered through one of two primary methods – mining and drilling. About 20 per cent of the reserves are close to the surface and can be mined using large shovels and trucks. Of concern are the effects of the industrial development on the environment. Both human-made and natural sources emit oxides of sulphur and nitrogen, trace elements and persistent organic compounds. Of additional concern are ground level ozone and greenhouse gases. Because of the requirement on operators to comply with the air quality regulatory policies, and to address public concerns, the not-for-profit, multi-stakeholder Wood Buffalo Environmental Association (WBEA) has since 1997 been closely monitoring air quality in AOSR. In 2008, WBEA assembled a distinguished group of international scientists who have been conducting measurements and practical research on various aspects of air emissions and their potential effects on terrestrial receptors. This book is a synthesis of the concepts and results of those on-going studies. It contains 19 chapters ranging from a global perspective of energy production, measurement methodologies and behavior of various air pollutants during fossil fuel production in a boreal forest ecosystem, towards designing and deploying a multi-disciplinary, proactive, and long-term environmental monitoring system that will also meet regulatory expectations. Covers measurement of emissions from very large industrial sources in a region with huge international media profile Validation of measurement technologies can be applied globally The new approaches to ecological monitoring described can be applied in other forested regions
Author : Ashu Dastoor
Publisher : Frontiers Media SA
ISBN 13 : 2832543685
Total Pages : 149 pages
Book Rating : 4.8/5 (325 download)
Download or read book Environmental chemistry of mercury: Sources, pathways, transformations and impact written by Ashu Dastoor and published by Frontiers Media SA. This book was released on 2024-01-29 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Nelson J. O'Driscoll
Publisher : Society of Environmental Toxicology & Chemistry
ISBN 13 :
Total Pages : 420 pages
Book Rating : 4.:/5 (318 download)
Download or read book Mercury Cycling in a Wetland-dominated Ecosystem written by Nelson J. O'Driscoll and published by Society of Environmental Toxicology & Chemistry. This book was released on 2005 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 264 pages
Book Rating : 4.:/5 (3 download)
Download or read book Environmental Health Perspectives written by and published by . This book was released on 1993 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Micheal Judah Campbell Singer
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)
Download or read book Mercury Cycling in Hydroelectric Reservoirs of Northern Manitoba Decades After Impoundment written by James Micheal Judah Campbell Singer and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the global climate changes and demand for renewable electricity increases, construction of hydroelectric dams is increasing globally though the impacts of regulating the worlds rivers are still understudied. Northern Manitoba, Canada, has extensive hydroelectric development since the 1950s; fish mercury (Hg) concentrations in on-system lakes were observed to have increased above human consumption guidelines upon impoundment and have taken decades to decrease towards natural concentrations. To better understand the long-term impacts of hydroelectric regulation on Hg in fish and other biota in Northern Manitoba, we determined methylmercury (MeHg) production potential in soil from the water fluctuation zone in on- and off-system lakes through a soil flooding incubation experiment in the laboratory. We further studied the historic flux of MeHg and Hg to the sediments in on- and off-system lakes and links to organic matter in these waterbodies. We found that MeHg production was highest in the water fluctuation zone of the on-system lakes, which may represent an increased source of MeHg to the food web in these environments even decades after impoundment. In addition, sedimentation rates were found to greatly affect Hg fluxes to the sediment in those waterbodies where increased water flows result in higher erosion and sedimentation. These findings provide new insight in our understanding of the long-term recovery of Hg cycling within on-system lakes decades after impoundment.
Author : United States. Great Lakes Basin Commission
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (31 download)
Download or read book Great Lakes Basin Framework Study written by United States. Great Lakes Basin Commission and published by . This book was released on 1976 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Model to Predict Concentrations and Uncertainty for Mercury Species in Lakes written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : To increase understanding of mercury cycling, a seasonal mass balance model was developed to predict mercury concentrations in lakes and fish. Results indicate that seasonality in mercury cycling is significant and is important for a northern latitude lake. Models, when validated, have the potential to be used as an alternative to measurements; models are relatively inexpensive and are not as time intensive. Previously published mercury models have neglected to perform a thorough validation. Model validation allows for regulators to be able to make more informed, confident decisions when using models in water quality management. It is critical to quantify uncertainty; models are often over-parameterized and constrained by few measurements. As an approach, the Markov Chain Monte Carlo (MCMC) Bayesian method was used for uncertainty analysis. The uncertainty analysis provided a better means for calibration, helpful insight on the distribution of model parameter values, and the uncertainty in model predictions.
Author :
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.3/5 (91 download)
Download or read book Proceedings and Summary Report written by and published by . This book was released on 2002 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Myles Hollander
Publisher : John Wiley & Sons
ISBN 13 : 1118553292
Total Pages : 872 pages
Book Rating : 4.1/5 (185 download)
Download or read book Nonparametric Statistical Methods written by Myles Hollander and published by John Wiley & Sons. This book was released on 2013-11-25 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: Praise for the Second Edition “This book should be an essential part of the personal library of every practicing statistician.”—Technometrics Thoroughly revised and updated, the new edition of Nonparametric Statistical Methods includes additional modern topics and procedures, more practical data sets, and new problems from real-life situations. The book continues to emphasize the importance of nonparametric methods as a significant branch of modern statistics and equips readers with the conceptual and technical skills necessary to select and apply the appropriate procedures for any given situation. Written by leading statisticians, Nonparametric Statistical Methods, Third Edition provides readers with crucial nonparametric techniques in a variety of settings, emphasizing the assumptions underlying the methods. The book provides an extensive array of examples that clearly illustrate how to use nonparametric approaches for handling one- or two-sample location and dispersion problems, dichotomous data, and one-way and two-way layout problems. In addition, the Third Edition features: The use of the freely available R software to aid in computation and simulation, including many new R programs written explicitly for this new edition New chapters that address density estimation, wavelets, smoothing, ranked set sampling, and Bayesian nonparametrics Problems that illustrate examples from agricultural science, astronomy, biology, criminology, education, engineering, environmental science, geology, home economics, medicine, oceanography, physics, psychology, sociology, and space science Nonparametric Statistical Methods, Third Edition is an excellent reference for applied statisticians and practitioners who seek a review of nonparametric methods and their relevant applications. The book is also an ideal textbook for upper-undergraduate and first-year graduate courses in applied nonparametric statistics.
Author :
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.3/5 (121 download)
Download or read book Deposition of Air Pollutants to the Great Waters written by and published by . This book was released on 2000 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.E/5 ( download)
Download or read book Program and Abstracts of the ... Conference on Great Lakes Research written by and published by . This book was released on 1989 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 884 pages
Book Rating : 4.3/5 (91 download)
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert D. Morrison
Publisher : Elsevier
ISBN 13 : 0080494781
Total Pages : 579 pages
Book Rating : 4.0/5 (84 download)
Download or read book Environmental Forensics written by Robert D. Morrison and published by Elsevier. This book was released on 2010-08-04 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental forensics is the application of scientific techniques for the purpose of identifying the source and age of a contaminant. Over the past several years, this study has been expanding as a course of study in academia, government and commercial markets. The US Environmental Protection Agency (EPA), Federal Bureau of Investigation (FBI), and Federal Emergency Management Agency (FEMA) are among the governmental agencies that utilize the study of environmental forensics to ensure national security and to ensure that companies are complying with standards. Even the International Network for Environmental Compliance and Enforcement (INECE), a group supported by the European Commission and the World Bank, utilizes the study of environmental forensics as it applies to terror threats.This title is a hands-on guide for environmental scientists, engineers, consultants and industrial scientists to identify the origin and age of a contaminant in the environment and the issues involved in the process. An expansion of the authors’ first title with Academic Press, Introduction to Environmental Forensics, this is a state-of-the-art reference for those exploring the scientific techniques available. Up-to-date compendium for referencing forensic techniques unique to particular contaminants. International scientific unit system Contributors from around the world providing international examples and case studies.
Author :
Publisher :
ISBN 13 :
Total Pages : 632 pages
Book Rating : 4.E/5 ( download)
Download or read book General Technical Report PNW-GTR written by and published by . This book was released on 2007 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 648 pages
Book Rating : 4.3/5 (91 download)
Download or read book EM written by and published by . This book was released on 1997 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
