EPA Science Inventory

Search Criteria: the term 'mercury' in any part of any record.
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Records 1 to 25 of 1432

HUMAN-ECOSYSTEM INTERACTIONS: THE CASE OF MERCURY (PRESENTATION)
Human and ecosystem exposure studies evaluate exposure of sensitive and vulnerable populations. We will discuss how ecosystem exposure modeling studies completed for input into the US Clean Air Mercury Rule (CAMR) to evaluate the response of aquatic ecosystems to changes in mercu...
Investigation Of A Mercury Speciation Technique For Flue Gas Desulfurization Materials (JOURNAL)
Most of the synthetic gypsum generated from wet flue gas desulfurization (FGD) scrubbers is currently being used for wallboard production. Because oxidized mercury is readily captured by the wet FGD scrubber, and coal-fired power plants equipped with wet scrubbers desire to bene...
Mercury mass balance in Lake Michigan--the knowns and unknowns (PRESENTATION)
LM2-Mercury, a mercury mass balance model, was developed to simulate and evaluate the transport, fate, and biogeochemical transformations of mercury in Lake Michigan. The model simulates total suspended solids (TSS), disolved organic carbon (DOC), and total, elemental, divalent, ...
STANDARDIZED AUTOMATED AND MANUAL METHODS TO SPECIATE MERCURY: FIELD AND LABORATORY STUDIES (PRESENTATION)
The urban atmosphere contains a large number of air pollutants including mercury. Atmospheric mercury is predominantly present in the elemental form (Hg0). However emissions from industrial activities (e.g. incinerators, fossil fuel combustion sources and others) emit other f...
The Relative Influence of Turbulence and Turbulent Mixing on the Adsorption of Mercury within a Gas-Sorbent Suspension (JOURNAL)
Our previous investigations demonstrated that entrained flow or in-flight adsorption can be a more effective and flexible approach to trace gas adsorption than fixed sorbent beds. The present investigation establishes the turbulent mixing that accompanies sorbent injection is an ...
The fate of mercury collected from air pollution control devices (JOURNAL)
The mercury that enters a coal-fired power plant, originates from the coal that is burned, and leaves through the output streams that include stack emissions and air pollution control (APC) residues (either in solid or liquid form). This article describes recent fmdings on the fa...
Exploring the effects of temperature and resource limitation on mercury bioaccumulation in Fundulus heteroclitus using dynamic energy budget modeling and behavioral assessment (PRESENTATION)
Global climate change is likely to affect both temperature and resource availability in aquatic ecosystems. While higher temperatures may result in increased food consumption and increased mercury accumulation, they may also lead to increased growth and reduced mercury accumulati...
Characteristics and distributions of atmospheric mercury emitted from anthropogenic sources in Guiyang, southwestern China (JOURNAL)
Continuous measurements of speciated atmospheric mercury (Hg), including gaseous elemental mercury (GEM), particulate mercury (PHg), and reactive gaseous mercury (RGM) were conducted in Guizhou Province, southwestern China. Guiyang Power Plant (GPP), Guiyang Wujiang Cement Plant,...
Global and regional contributions to total mercury concentrations in Lake Michigan water (JOURNAL)
A calibrated mercury component mass balance model, LM2-Mercury, was applied to Lake Michigan to predict mercury concentrations in the lake under different mercury loadings, mercury air concentrations, and management scenarios. Although post-audit data are few, model predictions (...
Influence of Reservoir Water Level Fluctuations on Sediment Methylmercury Concentrations Downstream of the Historical Black Butte Mercury Mine, OR (JOURNAL)
Mercury (Hg) is a pollutant of global concern due to its ability to accumulate as methylmercury (MeHg) in biota. Mercury is methylated by anaerobic microorganisms such as sulfate reducing bacteria (SRB) in water and sediment. Throughout North America, reservoirs tend to have e...
Simulating Mercury And Methyl Mercury Stream Concentrations At Multiple Scales in a Wetland Influenced Coastal Plain Watershed (McTier Creek, SC, USA) (PRESENTATION)
Use of Mechanistic Models to?Improve Understanding: Differential, mass balance, process-based Spatial and temporal resolution Necessary simplifications of system complexity Combing field monitoring and modeling efforts Balance between capturing complexity and maintaining...
Songbirds as Sentinels of Mercury in Terrestrial Foodwebs of Eastern North America (JOURNAL)
Mercury is a globally distributed environmental contaminant with a variety of deleterious effects in fish, wildlife, and humans. Breeding songbirds may be useful sentinels for mercury because they are relatively easy to sample, have well-defined and small territories, and integra...
Mercury Emissions Capture Efficiency with Activated Carbon Injection at a Russian Coal-Fired Thermal Power Plant (PUBLISHED REPORT)
This EPA-led project, conducted in collaboration with UNEP, the Swedish Environmental Institute and various Russian Institutes, that demonstrates that the mercury emission control efficiencies of activated carbon injection technologies applied at a Russian power plant burning Rus...
A mercury transport and fate model (LM2-mercury) for mass budget assessment of mercury cycling in Lake Michigan (JOURNAL)
LM2-Mercury, a mercury mass balance model, was developed to simulate and evaluate the transport, fate, and biogeochemical transformations of mercury in Lake Michigan. The model simulates total suspended solids (TSS), disolved organic carbon (DOC), and total, elemental, divalent, ...
Regional Air Quality Model Application of the Aqueous-Phase Photo Reduction of Atmospheric Oxidized Mercury by Dicarboxylic Acids (JOURNAL)
In most ecosystems, atmospheric deposition is the primary input of mercury. The total wet deposition of mercury in atmospheric chemistry models is sensitive to parameterization of the aqueous-phase reduction of divalent oxidized mercury (Hg2+). However, most atmospheric chemistry...
Characterization of Mercury Emissions from ASGM Goldshop Activities in Peru (PRESENTATION)
Mercury (Hg), used in artisanal small-scale gold mining (ASGM) practices, is recognized as a significant source of Hg release to the environment and is a major area of focus of the United Nations Environment Programme (UNEP) Global Mercury Partnership. Hg is used to bind (form a...
Investigation of Effects of Varying Model Inputs on Mercury Deposition Estimates in the Southwest US (JOURNAL)
The Community Multiscale Air Quality (CMAQ) model version 4.7.1 was used to simulate mercury wet and dry deposition for a domain covering the continental United States (US). The simulations used MM5-derived meteorological input fields and the US Environmental Protection Agency (E...
Gaseous Oxidized Mercury Dry Deposition Measurements in the FourCorners Area and Eastern Oklahoma, U.S.A. (JOURNAL)
Gaseous oxidized mercury (GOM) dry deposition measurements using surrogate surface passive samplers were collected in the Four Corners area and eastern Oklahoma from August, 2009–August, 2011. Using data from a six site area network, a characterization of the magnitude and spatia...
Field Tests of “In-Situ” Remediation of Groundwater From Dissolved Mercury Utilizing Sulfate Reducing Bacteria (PRESENTATION)
Field tests of biologically active filters have been conducted at groundwater mercury pollution site in Pavlodar, Kazakhstan. The biofilters represented cultures of sulfate-reducing bacteria (SRB) immobilized on claydite imbedded in wells drilled down to basalt clay layer (14-17 ...
Potential of aerobic bacteria use for remediation of groundwater of Pavlodar outskirt contaminated with soluble mercury compounds (JOURNAL)
In the Republic of Kazakhstan there are some regions contaminated with mercury as a result of technogenic releases from industrial enterprises. The mercury ingress into the environment has resulted in significant pollution of groundwater and surface water with soluble mercury com...
Linking Atmospheric Mercury Deposition to Human and Wildlife (Source to Receptor) by Coupling VELMA and WASP with BASS to simulate Fish Tissue Mercury Concentrations (PRESENTATION)
Mercury (Hg) is the toxicant responsible for the majority of fish advisories across the United States, with 1.25 million miles of rivers under advisory due to the exposure risk from ingesting Hg-contaminated fish. The processes governing Hg exposures in lotic ecosystems are not...
Kazakhstan In situ BioTransformation of Mercury-Contaminated Groundwater utilizing Native Aerobic and Anaerobic Bacteria (PRESENTATION)
Our final international work on the biological decontamination of the mercury contamination of soils in the Northern outskirts of Pavlodar as a result of activity at the former PO “Khimprom” chemical plant is reported here. The plant produced chlorine and alkali from the 1970s i...
Biogeochemical Cycling of Mercury Coupled with a Nitrogen and Carbon Watershed Hydrology Model (VELMA) (PRESENTATION)
Presented at 8th National Monitoring Conference - Water: One Resource - Shared Effort - Common Future, Portland, OR, April 30 - May 04, 2012
Modeling Mercury Exposure at Different Scales in the McTier Creek Watershed and Edisto River Basin, SC USA (PRESENTATION)
Mercury is the toxicant responsible for the largest number of fish advisories across the United States, with 1.25 million miles of rivers under advisory. The processes governing fate, transport, and transformation of mercury in lotic ecosystems are not well-understood, in large p...
Regional Scale Photochemical Model Evaluation of Total Mercury Wet Deposition and Speciated Ambient Mercury (JOURNAL)
Methylmercury is a known neurotoxin with deleterious health effects on humans and wildlife. Atmospheric deposition is the largest source of mercury loading to most terrestrial and aquatic ecosystems. Regional scale air quality models are needed to quantify mercury deposition resu...