Mercury

For more information on Mercury, please contact:

Marti Otto
Technology Assessment Branch
(703) 603-8853
otto.martha@epa.gov

Overview Policy and Guidance Chemistry and Behavior Environmental Occurrence Toxicology Detection and Site Characterization Treatment Technologies Conferences and Seminars Additional Resources

Environmental Occurrence

Mercury is a naturally occurring element and is generally found in nature in ore form. The most prevalent ore form is cinnabar (mercury sulfide). In the United States there are large cinnabar deposits at New Almaden and New Idria, California and minable deposits in Nevada, Utah, Oregon, Arkansas, Idaho, and Texas. Inorganic mercury also occurs in small amounts in many rock types (e.g., granite, shale). Atmospheric mercury levels tend to be higher in the vicinity of active volcanoes than in other areas that are not affected by human activities. Most, though not all, natural waters will contain a few parts per billion of naturally occurring mercury (depending on the types of rock through which the water flows), with fresh water concentrations being reported as high as 70 ppb.

Alkali and metal processing, incineration of coal, and medical and other waste, and mining and processing of gold ore contribute greatly to mercury concentrations in some areas, but atmospheric deposition is the dominant source of mercury over most of the landscape. Once in the atmosphere, mercury is widely disseminated and can circulate for years, accounting for its wide-spread distribution. Natural sources of atmospheric mercury include volcanoes, geologic deposits of mercury, and volatilization from the ocean. Although all rocks, sediments, water, and soils naturally contain small but varying amounts of mercury, scientists have found some local mineral occurrences and thermal springs that are naturally high in mercury.

According to EPA's 1997 mercury study report to Congress, of the estimated 158 tons of mercury emitted annually into the atmosphere by anthropogenic sources in the United States, approximately 87 percent is from combustion point sources, 10 percent is from manufacturing point sources, 2 percent is from area sources, and 1 percent is from miscellaneous sources. Four specific source categories account for approximately 80 percent of the total anthropogenic emissions—coal-fired utility boilers (33 percent), municipal waste combustion (19 percent), commercial/industrial boilers (18 percent), and medical waste incinerators (10 percent). Note that gold mining and processing operations, particularly mines in Nevada, have been found in more recent years to emit large quantities of mercury to the atmosphere.

Combustion sources can emit both elemental mercury and ionic mercury. Ionic mercury can be produced in the atmosphere by the oxidation of elemental mercury by ozone or other oxidants. Ionic mercury is water soluble and associates with particulates. Atmospheric deposition of elemental mercury is relatively fast, either as dry deposition or in precipitation. Mercury emissions from combustion sources can travel large distances before being deposited on land or water. Once they are deposited in water they have the potential to become converted to methylmercury, which is the major cause of bioaccumulation of mercury in fish and animals.

The areas having the greatest concentration of mercury emissions from anthropogenic sources of total mercury (i.e., all chemical species) are the urban areas in the northeast, the Tampa and Miami areas of Florida, and the larger urban areas of the Midwest and Ohio Valley and Texas. In general, these areas have considerable industrial activity and a large number of coal-fired electrical generation plants. The areas having generally the lowest emissions are in the High Plains region of the central United States. There generally are fewer large emission sources in the western third of the United States, with the exception of the San Francisco and Los Angeles areas and specific industrial operations (e.g., gold mining in Nevada).

Information regarding levels of mercury in specific geographic locations or water bodies may be available in a monitoring or characterization report. The Library of the U.S. Geological Survey provides links to several databases in which such reports can be located.

Jump to a Subsection General | Aquatic | Fish | Source

General

Background Information on Mercury Sources and Regulations
U.S. EPA Website, 2003.
Contact: Kathryn R. Mahaffey, mahaffey.kate@epa.gov

EMMMA: A Web-Based System for Environmental Mercury Mapping, Modeling, and Analysis
Paul P. Hearn, Jr., Stephen P. Wente, David I. Donato, and John J. Aguinaldo.
U.S. Geological Survey Open File Report 2006-1086, 17 pp, 2006

The EMMA website allows interactive use of a nationwide collection of environmental mercury data (fish tissue, atmospheric emissions and deposition, stream sediments, soils, and coal) and mercury-related data (mine locations); predictions of the National Descriptive Model of Mercury in Fish across the United States; and mapping and graphing capabilities to visualize spatial and temporal trends and study relationships between mercury and other variables.

• EMMMA Web Site

Pilot Survey of Levels of Polychlorinated Dibenzo-p-Dioxins, Polychlorinated Dibenzofurans, Polychlorinated Biphenyls and Mercury in Rural Soils of the United States
U.S. EPA, National Center for Environmental Assessment, Washington, DC. EPA 600-R-05-043F, 308 pp, 2007

Soil samples discussed in this report were collected in 2003 at 27 monitoring stations located in remote areas across the continental United States and Alaska, providing the basis for a study of air/soil relationships by comparison of historical air concentration data with the new soil data. The limited sampling results should not be interpreted as statistically representative of all rural soils in the United States; however, these results might provide a plausible basis for a preliminary characterization of soils in rural/remote areas.

U.S. Geological Survey Programs that Support Mercury Research

Aquatic

Contaminants in Aquatic Habitats at Hazardous Waste Sites: Mercury
National Oceanic and Atmospheric Administration, National Ocean Service, Office of Ocean Resources Conservation and Assessment.
NOS ORCA 100, 80 pp., 1996.
Contact: Nancy Beckvar, Nancy.Beckvar@noaa.gov

Deposition of Air Pollutants to the Great Waters, Third Report to Congress
U.S. EPA, Office of Air Quality Planning and Standards.
EPA 453-R-00-005, 22 pp., 2000.
Contact: Gale Lacy, lacy.gail@epa.gov

Mercury Contamination of Aquatic Ecosystems
D.P. Krabbenhoft and D.A. Rickert.
U.S. Geological Survey Fact Sheet FS-216-95, 4 pp., 1995.

Proceedings and Summary Report: Workshop on the Fate, Transport, and Transformation of Mercury in Aquatic and Terrestrial Environments
U.S. EPA, Office of Research and Development, and U.S. Geological Survey.
EPA 625-R-02-005, 180 pp., 2002.
Contact: Scott Minamyer, minamyer.scott@epa.gov

U.S. Geological Survey National Assessment of Mercury in Aquatic Ecosystems Home Page

Fish

Proceedings: National Forum on Mercury in Fish
U.S. EPA, Office of Water.
EPA 823-R-95-002, 278 pp., 1995.
Contact: Bruce Mintz, mintz.bruce@epa.gov

The National Survey of Mercury Concentrations in Fish, Database Summary 1990-1995
U.S. EPA, Office of Water, 218 pp., 1999.

A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients: Bioaccumulation in Fish
W.G. Brumbaugh, D.P. Krabbenhoft, D.R. Helsel, J.G. Wiener, and K.R. Echols.
U.S. Geological Survey Biological Science Report, USGS/BRD/BSR-2001-0009, 32 pp., 2001.

The overall objective of this survey was to identify ecosystem characteristics that favor the production and bioaccumulation of methylmercury and to compare bioaccumulation rates on a national basis.

Source

Mercury Transport and Fate in Watersheds
U.S. EPA, National Center for Environmental Research.
Star Report, Vol. 4, No. 1, Oct 2000.

Characterization of Products Containing Mercury in Municipal Solid Waste in the United States 1970 to 2000
U.S. EPA, Office of Solid Waste and Emergency Response. EPA 530-S-92-013, 1992.

Combustion of Hazardous Wastes Containing Arsenic, Lead, and Mercury
U.S. EPA, Office of Solid Waste and Emergency Response. EPA 530-R-94-018, 1994.

Geochemical Data for Environmental Studies of Mercury Mines in Nevada
John Gray, et al.
U.S. Geological Survey Open-File Report 99-0576, 21 pp., 1999.
Contact: John Gray, jgray@usgs.gov

This study aimed to determine if weathering of abandoned mercury mines in Nevada has resulted in any significant effect to surrounding ecosystems. The report describes the methods used for analysis and the geochemical data for samples collected in 1999.

Geologic Studies of Mercury by the U.S. Geological Survey
John E. Gray, U.S. Geological Survey.
U.S. Geological Survey Circular 1248, 47 pp., 2003.
Contact: John Gray, jgray@usgs.gov

Mercury in Massachusetts: an Evaluation of Sources, Emissions, Impacts and Controls
Massachusetts Department of Environmental Protection, 1996.
Contact: Mark Smith, C.Mark.Smith@state.ma.us

Mercury in U.S. Coal — Abundance, Distribution, and Modes of Occurrence
Susan J. Tewalt, Linda J. Bragg, and Robert B. Finkelman.
U.S. Geological Survey Fact Sheet 095-01, 4 pp., 2001.
Contact: Susan J. Tewalt, stewalt@usgs.gov; Robert B. Finkelman, rbf@usgs.gov

According to EPA estimates, emissions from coal-fired utilities account for 13 to 26 percent of the total (natural plus anthropogenic) airborne emissions of mercury in the United States.

Mercury Statistics and Information
Contact: William Brooks, wbrooks@usgs.gov

U.S. Geological Survey page for mercury availability and use in commerce.

Mercury Study Report to Congress Volume II: An Inventory of Anthropogenic Mercury Emissions in the United States
U.S. EPA, Office of Air Quality Planning & Standards and Office of Research and Development.
EPA 452-R-97-004, 181 pp., 1997.
Contact: Kathryn R. Mahaffey, mahaffey.kate@epa.gov

This volume estimates mercury emissions generated by human activities and provides abbreviated process descriptions, control technique options, emission factors, and activity levels for these sources. Where sufficient information is available, locations by city, county, and state are given for point sources.

Mercury Study Report to Congress Volume IV: An Assessment of Exposure to Mercury in the United States
U.S. EPA, Office of Air Quality Planning & Standards and Office of Research and Development.
EPA 452-R-97-004, 293 pp., 1997.
Contact: Kathryn R. Mahaffey, mahaffey.kate@epa.gov

Using deposition values obtained from fate and transport models, this assessment addresses the exposures that result from selected major anthropogenic combustion and manufacturing sources. This volume also estimates current exposures to the general U.S. population that result from mercury concentrations in freshwater and marine fish.

New Jersey Mercury Task Force Report: Volume III: Sources of Mercury to New Jersey's Environment
New Jersey Department of Environmental Protection.
Contact: Leslie McGeorge, 609-292-1623

Proceedings and Summary Report: Workshop on Mercury in Products, Processes, Waste and the Environment: Eliminating, Reducing and Managing Risks from Non-Combustion Sources
EPA 625-R-00-014, 94 pp., 2001.
Contact: Doug Grosse, grosse.doug@epa.gov

Toxics Release Inventory (TRI) Explorer
U.S. EPA Toxics Release Inventory Program Database.

A search under 'mercury' and 'mercury compounds' for a specific year produces a table that lists the amounts of these contaminants reported to have been disposed of and/or released from various commercial sites (e.g., mining sites, electric power plants) into surface media and the air.

Workshop on Source Emission and Ambient Air Monitoring of Mercury, September 13-14, 1999, Bloomington, MN
U.S. EPA, Office of Research and Development. EPA 625-R-00-002, 2000.
Contact: Scott Hedges, hedges.scott@epa.gov

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Last updated on Monday, April 7, 2008