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Showing 1 to 20 of 59 for “"Mercury (Hg)"”.
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Mercury Uptake by Wild Rice Plants in Northern Minnesota
Mercury (Hg) is a naturally occurring element that can be taken up by microbes, converted into toxic, organic methylmercury (MeHg), and exported into surrounding sediment. The MeHg can then be taken up by plants through rhizofiltration. In Minnesota, 2-4 million lbs of Wild Rice is harvested each …
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Mercury air surface exchange flux: A field study in the Bay Saint-Francois wetlands, Quebec, Canada.
Mercury (Hg) is a highly mobile environmental pollutant that is toxic to both human and wildlife at extremely low concentration. Aquatic ecosystem and especially wetlands are important environments for Hg biochemical transformation and cycling. An intensive two-part field study was conducted in the …
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Spalování uhlí jako zdroj kontaminace půd rtutí
Mercury (Hg) is a global pollutant, released into the environment from both, anthropogenic and natural sources. The most significant Hg emission source is burning of fossil fuels, especially coal combustion (60%). Although Hg occurs in low concentration in coal, a large volume of coal combusted …
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MERCURY IN BIG CYPRESS BAYOU AND CADDO LAKE WATERSHEDS IN MARION AND HARRISON COUNTIES TEXAS
… Quality 303(d) list for impairment due to mercury (Hg) content since 1996. One of the primary tributaries, Big Cypress Bayou, flows across Eocene-aged rocks and sediments associated with the Wilcox Group; the Wilcox is of interest because it contains lignite coal, which has a direct link to …
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PREDICTING CONTAMINANT TRANSFER FOLLOWING RE-ESTABLISHED CONNECTIVITY IN THE BOARDMAN RIVER
… reservoir of anthropogenic contaminants such as mercury (Hg), polychlorinated biphenyls (PCBs), dichloro-diphenyl-trichloroethylene (DDT), and organochloride compounds. Migratory fish accumulate and magnify contaminants within their tissues and transport them across ecosystem boundaries. …
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ΚΑΔΜΙΟ ΚΑΙ ΥΔΡΑΡΓΥΡΟΣ ΣΤΟ ΗΠΑΤΟΠΑΓΚΡΕΑΣ ΤΗΣ ΓΑΡΙΔΑΣ CALLIANASSA! TYRRHENA. ΒΙΟΣΥΣΣΩΡΕΥΣΗ ΚΑΙ ΕΠΙΔΡΑΣΕΙΣ ΣΕ ΔΙΑΛΥΤΕΣ ΠΡΩΤΕΙΝΕΣ, ΠΕΠΤΙΔΙΑ ΚΑΙ ΕΝΖΥΜΑ
… OF THE HEAVY METALS CADMIUM (CD) AND MERCURY (HG) FOR VARIOUS TIME PERIODS. SINCE HEPOTOPANCREAS IS CONSIDERED AS THE MAJOR DETOXIFICATION ORGAN, EXTRACTS OF THIS TISSUE WERE MAINLY UTILISED IN THIS STUDY. THE EFFECT OF CADMIUM AND MERCURY ON GENERAL PROTEINS, GENERAL PEPTIDES, METAL …
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A Field and Modeling Assessment of Methyl Mercury Accumulation in an Engineered Retention Pond
<p>The accumulation of methyl mercury (MeHg) in lakes during summer stratification has been demonstrated to affect biotic mercury (Hg) accumulation. However, small, shallow polymictic lakes can experience short-term stratification and mixing events that are largely unstudied in their abilities to …
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Sediment toxicity and bioaccumulation of toxicants in the zebra mussel, Dreissena polymorpha, at Times Beach, Buffalo, New York
… arsenic (As), chromium (Cr), barium (Ba), mercury (Hg), cadmium (Cd), lead (Pb), selenium (Se) and silver (Ag), were at or below detection limits in the water column. In the sediment toxicant concentrations were as high as 549 mg/kg for total PAHs, 9 mg/kg for PCB Aroclor 1248, and 54, 99, …
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Spatial, temporal and dendrochronological comparisons of mercury in Ontario deciduous trees
Mercury (Hg) research in Ontario has centered on aquatic environments since fish can be a significant source of methylmercury for humans. Interactions between terrestrial and aquatic environments in regards to the Hg cycle have received less attention. This study focuses on the role of trees as a …
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Peroxidase-mimicking nanomaterials for the detection of mercury (II) ions in water matrices
… growth, climate change and water deprivation. Mercury (Hg) is one of the most toxic elements on Earth, and continues to cause major threats to aquatic life, human health and the environment. Toxic methylmercury (MeHg) arises from atmospheric deposition and forms through bacterial conversion …
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Heavy Metal Distribution Across Three Georgia Estuaries Using Coastal Sharks As Sentinel Species
… filtering and sequestering contaminants, such as Mercury (Hg). This thesis examined blood total mercury (THg) concentrations of four coastal shark species and concentrations of five heavy metals (Hg, As, Cr, Cu, and Pb) within the water and sediments of three Georgia estuaries with varying levels …
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Exposure to Heavy Metals in American Robins: Impacts and Implications
… for copper (Cu), zinc (Zn), arsenic (As), mercury (Hg), and lead (Pb) and evaluated for changes in concentration across robins of different sexes, ages, and locations, as well as inter-elemental relationships. No significant changes in bone lead levels were detected. Seasonal variations in …
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Transformations of mercury in the marine water column
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research describing mercury methylation in anoxic sediments by anaerobic bacteria, …
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Investigation Of The Use And Application Of Passive Sampling Methods For Understanding Potential Sources Of Mercury To Western United States
Recent work has found elevated concentrations of mercury (Hg) in fish in some remote areas in the western United States. Atmospheric deposition of Hg has become an increasing concern as a major pathway for Hg entering ecosystems. Specifically, dry deposition is being recognized as an important way …
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MERCURY DISTRIBUTION IN SOILS AND STREAM SEDIMENTS OF CENTRAL INDIANA, USA
An investigation of mercury (Hg) in soils and stream sediments was conducted to understand the impact of urbanization on Hg deposition and accumulation on the upper west fork of the White River watershed in central Indiana. Samples were collected to the north and east (i.e., downwind) of emission …
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Transformations of mercury in the marine water column
Methylation of mercury (Hg) in the marine water column has been hypothesized to serve as the primary source of the bioaccumulating chemical species monomethylmercury (MMHg) to marine food webs. Despite decades of research describing mercury methylation in anoxic sediments by anaerobic bacteria, …
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Quantifying mercury surface fluxes by combining atmospheric observations and models
Mercury (Hg) is a critical environmental concern. Although an important component of its biogeochemical cycle, large uncertainties still exist in the estimates of surface fluxes of mercury. Three projects presented in this thesis improve our understanding of mercury surface fluxes at different …
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Mercury Bioaccumulation and Adverse Reproductive Effects in Snapping Turtles Inhabiting a Historically Contaminated River
Mercury (Hg) is a global pollutant that has received much attention due to its ability to bioaccumulate, biomagnify, and maternally transfers in humans and wildlife. In vertebrates, exposure to Hg can impair growth, alter behavior and morphology, decrease survival, and reduce reproductive success. …
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Individual and Interactive Effects of Maternally- and Trophically-Derived Mercury on Early Amphibian Development
Mercury (Hg) is an important environmental contaminant due to its global distribution, tendency to bioaccumulate, and toxicity to wildlife. However, Hg has received little attention in amphibians compared to other vertebrates, despite the fact that amphibian population declines have been documented …
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