Laboratory Terms

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

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Game Fish: Species like trout, salmon, or bass, caught for sport. Many of them show more...
Garbage: Animal and vegetable waste resulting from the handling, storage, sale, prepar...
Gas Chromatograph Mass Spectrometer: Instrument that identifies the molecular composition and concentrations of va...
Gasahol: Mixture of gasoline and ethanol derived from fermented agricultural products ...
Gasification: Conversion of solid material such as coal into a gas for use as a fuel.
Gasoline Volatility: The property of gasoline whereby it evaporates into a vapor. Gasoline vapor i...
General Permit: A permit applicable to a class or category of dischargers.
General Reporting Facility: A facility having one or more hazardous chemicals above the 10,000 pound thre...
Generally Recognized as Safe GRAS: Designation by the FDA that a chemical or substance (including certain pestic...
Generator: 1. A facility or mobile source that emits pollutants into the air or releases...
Genetic Engineering: A process of inserting new genetic information into existing cells in order t...
Genotoxic: Damaging to DNA; pertaining to agents known to damage DNA.
Geographic Information System GIS: A computer system designed for storing, manipulating, analyzing, and displayi...
Geological Log: A detailed description of all underground features (depth, thickness, type of...
Geophysical Log: A record of the structure and composition of the earth encountered when drill...
Geothermal Source Heat Pump: These heat pumps are underground coils to transfer heat from the ground to th...
Germicide: Any compound that kills disease-causing microorganisms.
Giardia Lamblia: Protozoan in the feces of humans and animals that can cause severe gastrointe...
Glass Containers: For recycling purposes, containers like bottles and jars for drinks, food, co...
Global Warming: An increase in the near surface temperature of the Earth. Global warming has ...
Global Warming Potential: The ratio of the warming caused by a substance to the warming caused by a sim...
Glovebag: A polyethylene or polyvinyl chloride bag-like enclosure affixed around an asb...
Gooseneck: A portion of a water service connection between the distribution system water...
Grab Sample: A single sample collected at a particular time and place that represents the ...
Grain Loading: The rate at which particles are emitted from a pollution source. Measurement ...
Granular Activated Carbon Treatment: A filtering system often used in small water systems and individual homes to ...
Grasscycling: Source reduction activities in which grass clippings are left on the lawn aft...
Grassed Waterway: Natural or constructed watercourse or outlet that is shaped or graded and est...
Gray Water: Domestic wastewater composed of wash water from kitchen, bathroom, and laundr...
Greenhouse Effect: The warming of the Earth's atmosphere attributed to a buildup of carbon dioxi...
Greenhouse Gas: A gas, such as carbon dioxide or methane, which contributes to potential clim...
Grinder Pump: A mechanical device that shreds solids and raises sewage to a higher elevatio...
Gross Alpha-Beta Particle Activity: The total radioactivity due to alpha or beta particle emissions as inferred f...
Gross Power-Generation Potential: The installed power generation capacity that landfill gas can support.
Ground Cover: Plants grown to keep soil from eroding.
Ground Water: The supply of fresh water found beneath the Earth's surface, usually in aquif...
Ground Water Under the Direct Influence UDI of Surface Water: Any water beneath the surface of the ground with: 1. significant occurence of...
Ground-Penetrating Radar: A geophysical method that uses high frequency electromagnetic waves to obtain...
Ground-Water Discharge: Ground water entering near coastal waters which has been contaminated by land...
Ground-Water Disinfection Rule: A 1996 amendment of the Safe Drinking Water Act requiring EPA to promulgate n...
Gully Erosion: Severe erosion in which trenches are cut to a depth greater than 30 centimete...

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