Sources, Transport, and Fate of Mercury in San Francisco Estuary and Tributaries PDF Download
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Author: Christopher Hughes Conaway
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
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Author: Christopher Hughes Conaway
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
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Author:
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ISBN:
Category : Mercury
Languages : en
Pages : 1
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Between January 2002 and January 2005, water samples were collected at a downstream location of the Sacramento River, CA to quantify mercury concentrations and loads in surface runoff associated with large storm events and re-suspension of river sediments. Mercury concentrations ranged from 3.2 to 14 ng/L and showed a strong correlation to suspended sediment concentrations (SSC). The collection of continuous SSC measurements by U.S. Geological Survey at the study location allowed for extrapolation of the limited mercury data to estimate daily average total mercury loads. For the four years of monitoring in water years (WYs) 2002 - 2005, daily mercury loads ranged from 3 to 4,140 g, while annual mercury loads ranged from approximately 58 kg in WY 2002 to 110 kg in WY 2004. Results from this study have helped refine current estimates of mercury loads to the Bay from the Sacramento-San Joaquin River system. In the context of other significant transport pathways and numerical models, these refined estimates will further assist in understanding the long-term fate of mercury and the recovery of water quality of the Bay.
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Category :
Languages : en
Pages :
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We develop and illustrate a general regional multi-species model that describes the fate and transport of mercury in three forms, elemental, divalent, and methylated, in a generic regional environment including air, soil, vegetation, water and sediment. The objectives of the model are to describe the fate of the three forms of mercury in the environment and determine the dominant physical sinks that remove mercury from the system. Chemical transformations between the three groups of mercury species are modeled by assuming constant ratios of species concentrations in individual environmental media. They illustrate and evaluate the model with an application to describe the fate and transport of mercury in the San Francisco Bay Area of California. The model successfully rationalizes the identified sources with observed concentrations of total mercury and methyl mercury in the San Francisco Bay Estuary. The mass balance provided by the model indicates that continental and global background sources control mercury concentrations in the atmosphere but loadings to water in the San Francisco Bay estuary are dominated by runoff from the Central Valley catchment and re-mobilization of contaminated sediments deposited during past mining activities. The model suggests that the response time of mercury concentrations in the San Francisco Bay estuary to changes in loadings is long, of the order of 50 years.
Author: David M. Whitacre
Publisher: Springer Science & Business Media
ISBN: 0387748164
Category : Science
Languages : en
Pages : 188
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Reviews of Environmental Contamination and Toxicology provides concise, critical reviews of timely advances, philosophy and significant areas of accomplished or needed endeavor in the total field of xenobiotics, in any segment of the environment, as well as toxicological implications. It covers all aspects of environmental contamination and associated toxicological consequences as well as facilitates the task of accessing and interpreting cogent scientific data.
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Category :
Languages : en
Pages :
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Author:
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Category : Mercury
Languages : en
Pages : 1
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Author:
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ISBN:
Category : Water
Languages : en
Pages : 882
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Author: Donald B. Porcella
Publisher: Springer
ISBN: 9789401040693
Category : Medical
Languages : en
Pages : 0
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ACKNOWLEDGEMENTS xiv PART I MERCURY AND HUMAN HEALTH B. WHEATLEY and S. PARADIS I Exposure of Canadian Aboriginal Peoples to Methylmercury 3-11 M. GIRARD and C. DUMONT I Exposure of James Bay Cree to Methylmercury during Pregnancy for the Years 1983-91 13-19 M. RICHARDSON, M. MITCHELL, S. COAD and R. RAPHAEL I Exposure to Mercury in Canada: A Multimedia Analysis 21-30 M. RICHARDSON, M. EGYED and D. J. CURRIE I Human Exposure to Mercury may Decrease as Acidic Deposition Increases 31-39 L. E. FLEMING, S. WATKINS, R. KADERMAN, B. LEVIN, D. R. AVYAR, M. BIZZIO, D. STEPHENS and J. A. BEAN I Mercury Exposure in Humans through Food Consumption from the Everglades of Florida 41-48 J. M. GEARHART, H. J. CLEWELL III, K. S. CRUMP, A. M. SHIPP and A. SILVERS I Pharmacokinetic Dose Estimates of Mercury in Children and Dose-Response Curves of Performance Tests in a Large Epidemiological Study 49-58 I. SKARE I Mass Balance and Systemic Uptake of Mercury Released from Dental Amalgam Fillings 59-67 J. DELLINGER, N. KMIECIK, S. GERSTENBERGER and H. NGU I Mercury Contamina tion of Fish in the Ojibwa Diet: I. Walleye Fillets and Skin-On versus Skin-Off Sampling 69-76 J. DELLINGER, L. MALEK and M. BEATTIE I Mercury Contamination of Fish in the Ojibwa Diet: II. Sensory Evoked Responses in Rats Fed Walleye 77-83 H. AKAGI, O. MALM, F. J. P. BRANCHES, Y. KINJO, Y. KASHIMA, J. R. D. GUIMARAES, R. B. OLIVEIRA, K. HARAGUCHI, W. C. PFEIFFER, Y.
Author:
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ISBN:
Category : Mercury
Languages : en
Pages : 180
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Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 942
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