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Records 26 to 50 of 1624 records about 'mercury'

ATMOSPHERIC MERCURY DEPOSITION TO LAKE MICHIGAN DURING THE LAKE MICHIGAN MASS BALANCE STUDY
(JOURNAL) [Published : Jul 30, 2002]
Wet and dry mercury (Hg) deposition were calculated to Lake Michigan using a hybrid receptor modeling framework. The model utilized mercury monitoring data collected during the Lake Michigan Mass Balance Study and the Atmospheric Exchange Over Lakes and Oceans Study together w...
ATMOSPHERIC MERCURY IN THE LAKE MICHIGAN BASIN: INFLUENCE OF THE CHICAGO/GARY URBAN AREA
(JOURNAL) [Published : Jul 30, 2002]
The relative importance of the Chicago/Gay urban area was investigated to determine its impact on atmospheric mercury (Hg) concentrations and wet deposition in the Lake Michigan basin. Event wet-only precipitation, total particulate, and vapor phase samples were collected for ...
ATMOSPHERIC MERCURY MEASUREMENTS: RECENT OBSERVATION IN THE GREAT LAKES BASIN
[Published : May 24, 2002]
In order to characterize ambient levels of vapor phase and particle mercury at source and receptor locations in the Great Lakes Basin, and to diagnose source regions of atmospheric mercury, samples were collected at three locations: llinois Institute of Technology (IIT) in Chicag...
ATMOSPHERIC MERCURY RESEARCH
[Published : Apr 25, 2003]
Environmental contamination from mercury has been recognized for decades as a growing problem to humans and wildlife. It is released from a variety of sources, exhibits a complicated chemistry, and proceeds via several different pathways to humans and wildlife. According to the...
ATMOSPHERIC MERCURY SIMULATION USING THE CMAQ MODEL: FORMULATION DESCRIPTION AND ANALYSIS OF WET DEPOSITION RESULTS
(JOURNAL) [Published : May 01, 2002]
The Community Multiscale Air Quality (CMAQ) modeling system has recently been adapted to simulate the emission, transport, transformation and deposition of atmospheric mercury in three distinct forms; elemental mercury gas, reactive gaseous mercury, and particulate mercury. Emis...
ATMOSPHERIC MERCURY TRANSPORT AND DEPOSITION
(PRESENTATION) [Presented : Mar 31, 2005]
The current state of our scientific understanding the mercury cycle tells us that most of the mercury getting into fish comes from atmospheric deposition, but methylation of that mercury in aquatic systems is required for the concentrations in fish to reach harmful levels. We st...
An Analysis of Simulated Wet Deposition of Mercury from the North American Mercury Model Intercomparison Study
(JOURNAL) [Published : Apr 18, 2009]
A previous intercomparison of atmospheric mercury models in North America has been extended to compare simulated and observed wet deposition of mercury. Three regional-scale atmospheric mercury models were tested; CMAQ, REMSAD and TEAM. These models were each employed using thr...
Application of Ecosystem-Scale Fate and Bioaccumulation Models to Predict Fish Mercury Response Times to Changes in Atmospheric Deposition
(JOURNAL) [Published : Mar 10, 2009]
Management strategies for controlling anthropogenic mercury emissions require understanding how ecosystems will respond to changes in atmospheric mercury deposition. Process-based mathematical models are valuable tools for informing such decisions, because measurement data often ...
Aquatic Ecosystem Exposure Associated with Atmospheric Mercury Deposition: Importance of Watershed and Water Body Hot Spots and Hot Moments
(PRESENTATION) [Presented : Dec 16, 2008]
Atmospheric deposition of divalent mercury (Hg(II)) is often the primary driving force for mercury contamination in fish tissue, resulting in mercury exposure to wildlife and humans. Transport and transformation of the deposited mercury into the environmentally relevant form, met...
Aqueous Elemental Mercury Production versus Mercury Inventories in the Lake Michigan Airshed: Deciphering the Spatial and Diel Controls of Mercury Gradients in Air and Water
(JOURNAL) [Published : Jan 05, 2021]
Atmospheric delivery mechanisms are the dominant pathways leading to mercury (Hg) contamination in the Upper Great Lakes, yet studies of gaseous Hg exchange between surface water and air are limited. Speciated atmospheric Hg, continuous surface dissolved gaseous Hg (DGM), profile...
Assessing The Impact Of Mercury Contamination To Lake Balkyldak In Kazakhstan
(PRESENTATION) [Presented : Feb 02, 2011]
Adjacent to Lake Balkyldak in Kazakhstan, there is a large wastewater holding pond from a former mercury cell chloralkali plant which contains high levels of mercury-contamination. The holding pond capacity is 74 million m<SUP>3</SUP> with a water-surface area of 18 km<SUP>2</SU...
Assessing the suitability of the Bad River as a reference system for the St Louis River AOC using geochemistry, biotic condition of macroinvertebrates and bioaccumulation of mercury.
(PRESENTATION) [Presented : Nov 08, 2018]
The St. Louis River Area of Concern (AOC) was designated in 1987 due to Beneficial Use Impairments (BUIs), including &ldquo;Restrictions on Fish and Wildlife Consumption&rdquo; (BUI 1) from historical pollutants. Minnesota and Wisconsin posted fish consumption advisories for the ...
Assessment of Caudal Fin Clips as a Non-lethal Technique for Predicting Muscle Tissue Mercury Concentrations in Largeouth Bass
(JOURNAL) [Published : Apr 01, 2008]
The statistical relationship between total mercury (Hg) concentration in clips from the caudal fin and muscle tissue of largemouth bass (Micropterus salmoides) from 26 freshwater sites in Rhode Island, USA was developed and evaluated to determine the utility of fin clip analysis ...
Assessment of Mercury in Fish Tissue from Select Lakes of Northeastern Oregon
(ASSESSMENT DOCUMENT) [Published : Feb 28, 2012]
A fish tissue study was conducted in five northeastern Oregon reservoirs to evaluate mercury concentrations in an area where elevated atmospheric mercury deposition had been predicted by a national EPA model, but where tissue data were sparse. The study targeted resident predator...
Atmospheric Mercury Deposition Monitoring – National Atmospheric Deposition Program (NADP)
[Published : Dec 31, 2014]
The National Atmospheric Deposition Program (NADP) developed and operates a collaborative network of atmospheric mercury monitoring sites based in North America – the Atmospheric Mercury Network (AMNet). The justification for the network was growing interest and demand from many ...
BEHAVIOR OF MERCURY, CHROMIUM, AND CADMIUM IN AQUATIC SYSTEMS
[Published : May 24, 2002]
This report is concerned with determining the fate and possible transformations of mercury, cadmium, and chromium in freshwater sediment-water environments. Mercury and cadmium show a high affinity for natural organic (humic and fulvic) material. Organic material may also cause o...
BIOAVAILABILITY OF MERCURY IN SEDIMENTS FROM A FLOOD CONTROL RESERVOIR TO HYALELLA AZTECA
(PRESENTATION) [Presented : Nov 14, 1999]
In the last three years, mercury contamination in North Mississippi flood control reservoirs has become a growing concern. Previous data indicate that three flood control reservoirs have similar total mercury sediment concentrations and that fish collected from one reservoir cont...
BIOGEOCHEMISTRY OF MERCURY IN VERMONT AND NEW HAMPSHIRE LAKES: AN ASSESSMENT OF MERCURY IN WATER, SEDIMENT, AND BIOTA OF VERMONT AND NEW HAMPSHIRE LAKES - COMPREHENSIVE FINAL PROJECT REPORT
(EXTRAMURAL DOCUMENT) [Published : Sep 30, 2004]
This report summarizes findings of a three-year field study of mercury in freshwater lakes of Vermont and New Hampshire. The study was undertaken jointly by the Vermont Department of Environmental Conservation, New Hampshire Department of Environmental Services, and Syracuse Univ...
BOUNDS ON SUBSURFACE MERCURY FLUX FROM THE SULPHUR BANK MERCURY MINE, LAKE COUNTY, CALIFORNIA
(PRESENTATION) [Presented : Nov 28, 2000]
The Sulphur Bank Mercury Mine (SBMM) in Lake County, California has been identified as a significant source of mercury to Clear Lake. The mine was operated from the 1860s through the 1950's. Mining started with surface operations, progressed to shaft mining, and later to open p...
Bacterial Mercury Methylation At The Sediment-Water Interface Of Mercury Contaminated Sediments
(PRESENTATION) [Presented : May 07, 2009]
Bench scale experiments were conducted to improve our understanding of bacterial mediation of mercury transformation (methylation), specifically those factors which govern the production of methyl mercury (MeHg) at the sediment-water interface. The greatest cause for concern re...
Bench Scale Experiments To Understand The Biogeochemical Factors For Production Of Methyl Mercury At The Sediment-Water Interface
(PRESENTATION) [Presented : Oct 19, 2010]
Mercury (Hg) is a naturally-occurring element that is ubiquitous in the environment. Although an effort has been made in recent years to decrease Hg emissions, historically-emitted Hg may be retained in the sediments of aquatic systems where they may be slowly converted to methy...
Bench-Scale Evaluation Of Chemically Bonded Phosphate Ceramic Technology To Stabilize Mercury Waste Mixtures
(JOURNAL) [Published : Mar 01, 2010]
This bench-scale study was conducted to evaluate the stabilization of mercury (Hg) and mercuric chloride-containing surrogate test materials by the chemically bonded phosphate ceramics technology. This study was performed as part of a U.S. EPA program to evaluate treatment and d...
Binding of Vapour-Phase Mercury (Hg0) on Chemically Treated Bauxite Residues (Red Mud)
(JOURNAL) [Published : Aug 19, 2008]
In this study, Hg capture using red mud, seawater-neutralized red mud, and acid-treated red mud is evaluated and compared to other, more conventional sorbent materials. Red mud (also known as bauxite residue) is a by-product of extracting alumina from ground bauxite ore by treati...
Biogeochemical Cycling of Mercury Coupled with a Nitrogen and Carbon Watershed Hydrology Model (VELMA)
(PRESENTATION) [Presented : May 04, 2012]
Presented at 8th National Monitoring Conference - Water: One Resource - Shared Effort - Common Future, Portland, OR, April 30 - May 04, 2012
CALIBRATION AND EVALUATION OF A MERCURY MODEL FOR A WESTERN STREAM AND CONSTRUCTED WETLAND
(JOURNAL) [Published : May 09, 2007]
Numerous studies have shown that Steamboat Creek in Nevada is highly contaminated with mercury, with aqueous mercury concentrations more than two orders of magnitude greater than nearby mountain streams. One objective of this study was to determine if the new Spreadsheet-based E...