Laboratory Terms

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

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Ultra Clean Coal UCC: Coal that is washed, ground into fine particles, then chemically treated to r...
Ultraviolet Rays: Radiation from the sun that can be useful or potentially harmful. UV rays fro...
Uncertainty Factor: One of several factors used in calculating the reference dose from experiment...
Unconfined Aquifer: An aquifer containing water that is not under pressure; the water level in a ...
Underground Injection Control UIC: The program under the Safe Drinking Water Act that regulates the use of wells...
Underground Injection Wells: Steel- and concrete-encased shafts into which hazardous waste is deposited by...
Underground Sources of Drinking Water: Aquifers currently being used as a source of drinking water or those capable ...
Underground Storage Tank UST: A tank located at least partially underground and designed to hold gasoline o...
Unreasonable Risk: Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), "unrea...
Unsaturated Zone: The area above the water table where soil pores are not fully saturated, alth...
Upper Detection Limit: The largest concentration that an instrument can reliably detect.
Uranium Mill Tailings Piles: Former uranium ore processing sites that contain leftover radioactive materia...
Uranium Mill-Tailings Waste Piles: Licensed active mills with tailings piles and evaporation ponds created by ac...
Urban Runoff: Storm water from city streets and adjacent domestic or commercial properties ...
Urea-Formaldehyde Foam Insulation: A material once used to conserve energy by sealing crawl spaces, attics, etc....
Use Cluster: A set of competing chemicals, processes, and/or technologies that can substit...
Used Oil: Spent motor oil from passenger cars and trucks collected at specified locatio...
User Fee: Fee collected from only those persons who use a particular service, as compar...
Utility Load: The total electricity demand for a utility district.

Analytical testing dots

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