Laboratory Terms L

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

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62 results match your search term:  L


Laboratory Animal Studies
Investigations using animals as surrogates for humans.

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Lagoon
1. A shallow pond where sunlight, bacterial action, and oxygen work to purify...

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Land Application
Discharge of wastewater onto the ground for treatment or reuse.

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Land Ban
Phasing out of land disposal of most untreated hazardous wastes, as mandated ...

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Land Disposal Restrictions
Rules that require hazardous wastes to be treated before disposal on land to ...

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Land Farming of Waste
A disposal process in which hazardous waste deposited on or in the soil is de...

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Landfills
1. Sanitary landfills are disposal sites for non-hazardous solid wastes sprea...

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Landscape
The traits, patterns, and structure of a specific geographic area, including ...

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Landscape Characterization
Documentation of the traits and patterns of the essential elements of the lan...

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Landscape Ecology
The study of the distribution patterns of communities and ecosystems, the eco...

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Landscape Indicator
A measurement of the landscape, calculated from mapped or remotely sensed dat...

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Langelier Index LI
An index reflecting the equilibrium pH of a water with respect to calcium and...

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Large Quantity Generator
Person or facility generating more than 2200 pounds of hazardous waste per mo...

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Large Water System
A water system that services more than 50,000 customers.

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Laser Induced Fluorescence
A method for measuring the relative amount of soil and/or groundwater with an...

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Latency
Time from the first exposure of a chemical until the appearance of a toxic ef...

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Lateral Sewers
Pipes that run under city streets and receive the sewage from homes and busin...

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Laundering Weir
Sedimention basin overflow weir.

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LC 50 Lethal Concentration
Median level concentration, a standard measure of toxicity. It tells how much...

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LD 50 Lethal Dose
The dose of a toxicant or microbe that will kill 50 percent of the test organ...

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Ldlo
Lethal dose low; the lowest dose in an animal study at which lethality occurs.

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Leachate
Water that collects contaminants as it trickles through wastes, pesticides or...

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Leachate Collection System
A system that gathers leachate and pumps it to the surface for treatment.

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Leaching
The process by which soluble constituents are dissolved and filtered through ...

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Lead Pb
A heavy metal that is hazardous to health if breathed or swallowed. Its use i...

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Lead Service Line
A service line made of lead which connects the water to the building inlet an...

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Legionella
A genus of bacteria, some species of which have caused a type of pneumonia ca...

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Lethal Concentration 50
Also referred to as LC50, a concentration of a pollutant or effluent at which...

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Lethal Dose 50
Also referred to as LD50, the dose of a toxicant that will kill 50 percent of...

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Level of Concern LOC
The concentration in air of an extremely hazardous substance above which ther...

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Life Cycle of a Product
All stages of a product's development, from extraction of fuel for power to p...

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Lifetime Average Daily Dose
Figure for estimating excess lifetime cancer risk.

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Lifetime Exposure
Total amount of exposure to a substance that a human would receive in a lifet...

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Lift
In a sanitary landfill, a compacted layer of solid waste and the top layer of...

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Light Non-Aqueous Phase Liquid LNAPL
A non-aqueous phase liquid with a specific gravity less than 1.0. Because the...

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Light-Emitting Diode
A long-lasting illumination technology used for exit signs which requires ver...

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Limestone Scrubbing
Use of a limestone and water solution to remove gaseous stack-pipe sulfur bef...

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Limit of Detection LOD
The minimum concentration of a substance being analyzed test that has a 99 pe...

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Limited Degradation
An environmental policy permitting some degradation of natural systems but te...

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Limiting Factor
A condition whose absence or excessive concentration, is incompatible with th...

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Limnology
The study of the physical, chemical, hydrological, and biological aspects of ...

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Lindane
A pesticide that causes adverse health effects in domestic water supplies and...

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Liner
1. A relatively impermeable barrier designed to keep leachate inside a landfi...

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Lipid Solubility
The maximum concentration of a chemical that will dissolve in fatty substance...

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Liquefaction
Changing a solid into a liquid.

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Liquid Injection Incinerator
Commonly used system that relies on high pressure to prepare liquid wastes fo...

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List
Shorthand term for EPA list of violating facilities or firms debarred from ob...

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Listed Waste
Wastes listed as hazardous under RCRA but which have not been subjected to th...

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Lithology
Mineralogy, grain size, texture, and other physical properties of granular so...

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Litter
1. The highly visible portion of solid waste carelessly discarded outside the...

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Littoral Zone
1. That portion of a body of fresh water extending from the shoreline lakewar...

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Local Education Agency LEA
In the asbestos program, an educational agency at the local level that exists...

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Local Emergency Planning Committee LEPC
A committee appointed by the state emergency response commission, as required...

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Low Density Polyethylene LDPE
Plastic material used for both rigid containers and plastic film applications.

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Low Emissivity low-E Windows
New window technology that lowers the amount of energy loss through windows b...

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Low NOx Burners
One of several combustion technologies used to reduce emissions of Nitrogen O...

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Low-Level Radioactive Waste LLRW
Wastes less hazardous than most of those associated with a nuclear reactor; g...

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Lower Detection Limit
The smallest signal above background noise an instrument can reliably detect.

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Lower Explosive Limit LEL
The concentration of a compound in air below which the mixture will not catch...

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Lowest Acceptable Daily Dose
The largest quantity of a chemical that will not cause a toxic effect, as det...

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Lowest Achievable Emission Rate
Under the Clean Air Act, the rate of emissions that reflects (1) the most str...

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Lowest Observed Adverse Effect Level LOAEL
The lowest level of a stressor that causes statistically and biologically sig...

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