Laboratory Terms M

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

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107 results match your search term:  M


Macropores
Secondary soil features such as root holes or desiccation cracks that can cre...

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Magnetic Separation
Use of magnets to separate ferrous materials from mixed municipal waste stream.

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Major Modification
This term is used to define modifications of major stationary sources of emis...

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Major Stationary Sources
Term used to determine the applicability of Prevention of Significant Deterio...

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Majors
Larger publicly owned treatment works (POTWs) with flows equal to at least on...

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Man-Made Beta Particle and Photon Emitters
All radionuclides emitting beta particles and/or photons listed in Maximum Pe...

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Management Plan
Under the Asbestos Hazard Emergency Response Act (AHERA), a document that eac...

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Managerial Controls
Methods of nonpoint source pollution control based on decisions about managin...

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Mandatory Recycling
Programs which by law require consumers to separate trash so that some or all...

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Manifest
A one-page form used by haulers transporting waste that lists EPA identificat...

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Manifest System
Tracking of hazardous waste from "cradle-to-grave" (generation through dispos...

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Manual Separation
Hand sorting of recyclable or compostable materials in waste.

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Manufactured Gas Plant
A Manufactured Gas Plant, or MGP, was an industrial plant that produced gas, ...

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Manufacturers Formulation
A list of substances or component parts as described by the maker of a coatin...

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Manufacturing Use Product
Any product intended (labeled) for formulation or repackaging into other pest...

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Margin of Exposure MOE
The ratio of the no-observed adverse-effect-level to the estimated exposure d...

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Margin of Safety
Maximum amount of exposure producing no measurable effect in animals (or stud...

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Marine Sanitation Device
Any equipment or process installed on board a vessel to receive, retain, trea...

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Marsh
A type of wetland that does not accumulate appreciable peat deposits and is d...

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Material Category
In the asbestos program, broad classification of materials into thermal surfa...

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Material Safety Data Sheet MSDS
A compilation of information required under the OSHA Communication Standard o...

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Material Type
Classification of suspect material by its specific use or application; e.g., ...

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Materials Recovery Facility MRF
A facility that processes residentially collected mixed recyclables into new ...

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Maximally Exposed Individual
The person with the highest exposure in a given population.

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Maximum Acceptable Toxic Concentration
For a given ecological effects test, the range (or geometric mean) between th...

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Maximum Available Control Technology MACT
The emission standard for sources of air pollution requiring the maximum redu...

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Maximum Contaminant Level
The maximum permissible level of a contaminant in water delivered to any user...

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Maximum Contaminant Level Goal MCLG
Under the Safe Drinking Water Act, a non-enforceable concentration of a drink...

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Maximum Exposure Range
Estimate of exposure or dose level received by an individual in a defined pop...

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Maximum Residue Level
Comparable to a U.S. tolerance level, the Maximum Residue Level the enforceab...

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Maximum Tolerated Dose
The maximum dose that an animal species can tolerate for a major portion of i...

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Measure of Effect Measurement Endpoint
A measurable characteristic of ecological entity that can be related to an as...

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Measure of Exposure
A measurable characteristic of a stressor (such as the specific amount of mer...

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Mechanical Aeration
Use of mechanical energy to inject air into water to cause a waste stream to ...

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Mechanical Separation
Using mechanical means to separate waste into various components.

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Mechanical Turbulence
Random irregularities of fluid motion in air caused by buildings or other non...

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Media
Specific environments--air, water, soil--which are the subject of regulatory ...

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Medical Surveillance
A periodic comprehensive review of a worker's health status; acceptable eleme...

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Medical Waste
Any solid waste generated in the diagnosis, treatment, or immunization of hum...

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Medium-size Water System
A water system that serves 3,300 to 50,000 customers.

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Meniscus
The curved top of a column of liquid in a small tube.

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Mercury
Mercury is a naturally occurring element that is found in air, water and soil...

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Mercury Hg
Heavy metal that can accumulate in the environment and is highly toxic if bre...

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Mesotrophic
Reservoirs and lakes which contain moderate quantities of nutrients and are m...

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Metabolites
Any substances produced by biological processes, such as those from pesticides.

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Metalimnion
The middle layer of a thermally stratified lake or reservoir. In this layer t...

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Methane
A colorless, nonpoisonous, flammable gas created by anaerobic decomposition o...

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Methanol
An alcohol that can be used as an alternative fuel or as a gasoline additive....

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Method 18
An EPA test method which uses gas chromatographic techniques to measure the c...

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Method 24
An EPA reference method to determine density, water content and total volatil...

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Method 25
An EPA reference method to determine the VOC concentration in a gas stream.

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Method Detection Limit MDL
The minimum concentration that can be measured and reported with 99 percent c...

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Method Reporting Limit MRL
The lowest amount of an analyte in a sample that can be quantitatively determ...

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Methoxychlor
Pesticide that causes adverse health effects in domestic water supplies and i...

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Methyl Orange Alkalinity
A measure of the total alkalinity in a water sample in which the color of met...

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Microbial Growth
The amplification or multiplication of microorganisms such as bacteria, algae...

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Microbial Pesticide
A microorganism that is used to kill a pest, but is of minimum toxicity to hu...

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Microclimate
1. Localized climate conditions within an urban area or neighborhood. 2. The ...

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Microenvironmental Method
A method for sequentially assessing exposure for a series of microenvironment...

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Microenvironments
Well-defined surroundings such as the home, office, or kitchen that can be tr...

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Million-Gallons Per Day MGD
A measure of water flow.

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Minimization
A comprehensive program to minimize or eliminate wastes, usually applied to w...

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Mining of an Aquifer
Withdrawal over a period of time of ground water that exceeds the rate of rec...

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Mining Waste
Residues resulting from the extraction of raw materials from the earth.

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Minor Source
New emissions sources or modifications to existing emissions sources that do ...

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Minors
Publicly owned treatment works with flows less than 1 million gallons per day.

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Miscellaneous ACM
Interior asbestos-containing building material or structural components, memb...

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Miscellaneous Materials
Interior building materials on structural components, such as floor or ceilin...

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Miscible Liquids
Two or more liquids that can be mixed and will remain mixed under normal cond...

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Missed Detection
The situation that occurs when a test indicates that a tank is "tight" when i...

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Mist
Liquid particles measuring 40 to 500 micrometers (pm), are formed by condensa...

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Mitigation
Measures taken to reduce adverse impacts on the environment.

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Mixed Funding
Settlements in which potentially responsible parties and EPA share the cost o...

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Mixed Glass
Recovered container glass not sorted into categories (e.g. color, grade).

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Mixed Liquor
A mixture of activated sludge and water containing organic matter undergoing ...

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Mixed Metals
Recovered metals not sorted into categories such as aluminum, tin, or steel c...

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Mixed Municipal Waste
Solid waste that has not been sorted into specific categories (such as plasti...

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Mixed Paper
Recovered paper not sorted into categories such as old magazines, old newspap...

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Mixed Plastic
Recovered plastic unsorted by category.

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Mobile Incinerator Systems
Hazardous waste incinerators that can be transported from one site to another.

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Mobile Source
Any non-stationary source of air pollution such as cars, trucks, motorcycles,...

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Model Plant
A hypothetical plant design used for developing economic, environmental, and ...

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Modified Bin Method
Way of calculating the required heating or cooling for a building based on de...

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Modified Source
The enlargement of a major stationary pollutant sources is often referred to ...

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Moisture Content
1.The amount of water lost from soil upon drying to a constant weight, expres...

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Molecule
The smallest division of a compound that still retains or exhibits all the pr...

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Molten Salt Reactor
A thermal treatment unit that rapidly heats waste in a heat-conducting fluid ...

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Monitoring
Periodic or continuous surveillance or testing to determine the level of comp...

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Monitoring Well
1. A well used to obtain water quality samples or measure groundwater levels....

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Monoclonal Antibodies
1. Man-made (anthropogenic) clones of a molecule, produced in quantity for me...

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Monomictic
Lakes and reservoirs which are relatively deep, do not freeze over during win...

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Montreal Protocol
Treaty, signed in 1987, governs stratospheric ozone protection and research, ...

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Moratorium
During the negotiation process, a period of 60 to 90 days during which EPA an...

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Morbidity
Rate of disease incidence.

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Most Probable Number
An estimate of microbial density per unit volume of water sample, based on pr...

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Muck Soils
Earth made from decaying plant materials.

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Mudballs
Round material that forms in filters and gradually increases in size when not...

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Mulch
A layer of material (wood chips, straw, leaves, etc.) placed around plants to...

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Multi-Media Approach
Joint approach to several environmental media, such as air, water, and land.

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Multiple Chemical Sensitivity
A diagnostic label for people who suffer multi-system illnesses as a result o...

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Multiple Use
Use of land for more than one purpose; e.g., grazing of livestock, watershed ...

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Multistage Remote Sensing
A strategy for landscape characterization that involves gathering and analyzi...

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Municipal Discharge
Discharge of effluent from waste water treatment plants which receive waste w...

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Municipal Sewage
Wastes (mostly liquid) orginating from a community; may be composed of domest...

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Municipal Sludge
Semi-liquid residue remaining from the treatment of municipal water and waste...

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Municipal Solid Waste
Common garbage or trash generated by industries, businesses, institutions, an...

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Mutagen
An agent that causes a permanent genetic change in a cell other than that whi...

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