Laboratory Terms E

A glossary of science, chemistry, environmental and laboratory terms.

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106 results match your search term:  E


Ecological Entity
In ecological risk assessment, a general term referring to a species, a group...

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Ecological Exposure
Exposure of a non-human organism to a stressor.

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Ecological Impact
The effect that a man-caused or natural activity has on living organisms and ...

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Ecological Indicator
A characteristic of an ecosystem that is related to, or derived from, a measu...

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Ecological Integrity
A living system exhibits integrity if, when subjected to disturbance, it sust...

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Ecological Risk Assessment
The application of a formal framework, analytical process, or model to estima...

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Ecology
The relationship of living things to one another and their environment, or th...

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Economic Poisons
Chemicals used to control pests and to defoliate cash crops such as cotton.

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Ecosphere
The "bio-bubble" that contains life on earth, in surface waters, and in the a...

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Ecosystem
The interacting system of a biological community and its non-living environme...

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Ecosystem Structure
Attributes related to the instantaneous physical state of an ecosystem; examp...

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Ecotone
A habitat created by the juxtaposition of distinctly different habitats; an e...

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Effluent
Wastewater--treated or untreated--that flows out of a treatment plant, sewer,...

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Effluent Guidelines
Technical EPA documents which set effluent limitations for given industries a...

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Effluent Limitation
Restrictions established by a state or EPA on quantities, rates, and concentr...

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Ejector
A device used to disperse a chemical solution into water being treated.

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Electrodialysis
A process that uses electrical current applied to permeable membranes to remo...

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Electromagnetic Geophysical Methods
Ways to measure subsurface conductivity via low-frequency electromagnetic ind...

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Electrostatic Precipitator ESP
A device that removes particles from a gas stream (smoke) after combustion oc...

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Eligible Costs
The construction costs for wastewater treatment works upon which EPA grants a...

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EMAP Data
Environmental monitoring data collected under the auspices of the Environment...

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Emergency and Hazardous Chemical Inventory
An annual report by facilities having one or more extremely hazardous substan...

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Emergency Chemical
A situation created by an accidental release or spill of hazardous chemicals ...

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Emergency Exemption
Provision in FIFRA under which EPA can grant temporary exemption to a state o...

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Emergency Removal Action
1. Steps take to remove contaminated materials that pose imminent threats to ...

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Emergency Response Values
Concentrations of chemicals, published by various groups, defining acceptable...

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Emergency Suspension
Suspension of a pesticide product registration due to an imminent hazard. The...

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Emission
Pollution discharged into the atmosphere from smokestacks, other vents, and s...

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Emission Cap
A limit designed to prevent projected growth in emissions from existing and f...

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Emission Factor
The relationship between the amount of pollution produced and the amount of r...

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Emission Inventory
A listing, by source, of the amount of air pollutants discharged into the atm...

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Emission Standard
The maximum amount of air polluting discharge legally allowed from a single s...

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Emissions Trading
The creation of surplus emission reductions at certain stacks, vents or simil...

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Emulsifier
A chemical that aids in suspending one liquid in another. Usually an organic ...

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Encapsulation
The treatment of asbestos-containing material with a liquid that covers the s...

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Enclosure
Putting an airtight, impermeable, permanent barrier around asbestos-containin...

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End User
Consumer of products for the purpose of recycling. Excludes products for re-u...

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End-of-the-pipe
Technologies such as scrubbers on smokestacks and catalytic convertors on aut...

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End-use Product
A pesticide formulation for field or other end use. The label has instruction...

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Endangered Species
Animals, birds, fish, plants, or other living organisms threatened with extin...

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Endangerment Assessment
A study to determine the nature and extent of contamination at a site on the ...

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Endocrine Disrupting Compounds EDCs
Endocrine disruptors are exogenous substances that act like hormones in the e...

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Endrin
A pesticide toxic to freshwater and marine aquatic life that produces adverse...

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Energy Management System
A control system capable of monitoring environmental and system loads and adj...

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Energy Recovery
Obtaining energy from waste through a variety of processes (e.g. combustion).

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Enforceable Requirements
Conditions or limitations in permits issued under the Clean Water Act Section...

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Enforcement
EPA, state, or local legal actions to obtain compliance with environmental la...

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Enforcement Decision Document EDD
A document that provides an explanation to the public of EPA's selection of t...

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Engineered Controls
Method of managing environmental and health risks by placing a barrier betwee...

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Enhanced Inspection and Maintenance
An improved automobile inspection and maintenance program--aimed at reducing ...

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Enrichment
The addition of nutrients (e.g. nitrogen, phosphorus, carbon compounds) from ...

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Entrain
To trap bubbles in water either mechanically through turbulence or chemically...

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Environment
The sum of all external conditions affecting the life, development and surviv...

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Environmental Assessment
An environmental analysis prepared pursuant to the National Environmental Pol...

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Environmental Audit
An independent assessment of the current status of a party's compliance with ...

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Environmental Equity
Equal protection from environmental hazards for individuals, groups, or commu...

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Environmental Exposure
Human exposure to pollutants originating from facility emissions. Threshold l...

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Environmental Fate
The destiny of a chemical or biological pollutant after release into the envi...

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Environmental Fate Data
Data that characterize a pesticide's fate in the ecosystem, considering facto...

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Environmental Impact Statement
A document required of federal agencies by the National Environmental Policy ...

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Environmental Indicator
A measurement, statistic or value that provides a proximate gauge or evidence...

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Environmental Justice
The fair treatment of people of all races, cultures, incomes, and educational...

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Environmental Lien
A charge, security, or encumbrance on a property's title to secure payment of...

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Environmental Medium
A major environmental category that surrounds or contacts humans, animals, pl...

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Environmental Monitoring for Public Access and Community Tracking
Joint EPA, NOAA, and USGS program to provide timely and effective communicati...

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Environmental Response Team
EPA experts located in Edison, N.J., and Cincinnati, OH, who can provide arou...

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Environmental Risk
The potential for adverse effects on living organisms associated with polluti...

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Environmental Site Assessment
The process of determining whether contamination is present on a parcel of re...

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Environmental Sustainability
Maintenance of ecosystem components and functions for future generations.

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Environmental Tobacco Smoke
Mixture of smoke from the burning end of a cigarette, pipe, or cigar and smok...

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Epidemiology
Study of the distribution of disease, or other health-related states and even...

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Epilimnion
Upper waters of a thermally stratified lake subject to wind action.

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Episode
An air pollution incident in a given area caused by a concentration of atmosp...

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Equilibrium
In relation to radiation, the state at which the radioactivity of consecutive...

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Equivalent Method
Any method of sampling and analyzing for air pollution which has been demonst...

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Erosion
The wearing away of land surface by wind or water, intensified by land-cleari...

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Established Treatment Technologies
Technologies for which cost and performance data are readily available.

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Estimated Environmental Concentration
The estimated pesticide concentration in an ecosystem.

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Estuary
Region of interaction between rivers and near-shore ocean waters, where tidal...

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Ethanol
An alternative automotive fuel derived from grain and corn; usually blended w...

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Ethylene Dibromide EDB
A chemical used as an agricultural fumigant and in certain industrial process...

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Eutrophic Lakes
Shallow, murky bodies of water with concentrations of plant nutrients causing...

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Eutrophication
The slow aging process during which a lake, estuary, or bay evolves into a bo...

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Evaporation Ponds
Areas where sewage sludge is dumped and dried.

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Evapotranspiration
The loss of water from the soil both by evaporation and by transpiration from...

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Exceedance
Violation of the pollutant levels permitted by environmental protection stand...

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Exclusion
In the asbestos program, one of several situations that permit a Local Educat...

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Exclusionary Ordinance
Zoning that excludes classes of persons or businesses from a particular neigh...

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Exempt Solvent
Specific organic compounds not subject to requirements of regulation because ...

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Exempted Aquifer
Underground bodies of water defined in the Underground Injection Control prog...

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Exemption
A state (with primacy) may exempt a public water system from a requirement in...

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Exotic Species
A species that is not indigenous to a region.

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Experimental Use Permit
A permit granted by EPA that allows a producer to conduct tests of a new pest...

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Explosive Limits
The amounts of vapor in the air that form explosive mixtures; limits are expr...

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Exports
In solid waste program, municipal solid waste and recyclables transported out...

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Exposure
The amount of radiation or pollutant present in a given environment that repr...

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Exposure Assessment
Identifying the pathways by which toxicants may reach individuals, estimating...

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Exposure Concentration
The concentration of a chemical or other pollutant representing a health thre...

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Exposure Indicator
A characteristic of the environment measured to provide evidence of the occur...

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Exposure Level
The amount (concentration) of a chemical at the absorptive surfaces of an org...

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Exposure Pathway
The path from sources of pollutants via, soil, water, or food to man and othe...

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Exposure Route
The way a chemical or pollutant enters an organism after contact; i.e. by ing...

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Exposure-Response Relationship
The relationship between exposure level and the incidence of adverse effects.

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Extraction Procedure
Determining toxicity by a procedure which simulates leaching; if a certain co...

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Extraction Well
A discharge well used to remove groundwater or air.

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Extremely Hazardous Substances
Any of 406 chemicals identified by EPA as toxic, and listed under SARA Title ...

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