Laboratory Terms O

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

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63 results match your search term:  O


Ocean Discharge Waiver
A variance from Clean Water Act requirements for discharges into marine waters.

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Odor Threshold
The minimum odor of a water or air sample that can just be detected after suc...

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OECD Guidelines
Testing guidelines prepared by the Organization of Economic and Cooperative D...

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Off-Site Facility
A hazardous waste treatment, storage or disposal area that is located away fr...

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Office Paper
High grade papers such as copier paper, computer printout, and stationary alm...

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Offsets
A concept whereby emissions from proposed new or modified stationary sources ...

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Offstream Use
Water withdrawn from surface or groundwater sources for use at another place.

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Oil and Gas Waste
Gas and oil drilling muds, oil production brines, and other waste associated ...

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Oil Desulfurization
Widely used precombustion method for reducing sulfur dioxide emissions from o...

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Oil Fingerprinting
A method that identifies sources of oil and allows spills to be traced to the...

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Oil Spill
An accidental or intentional discharge of oil which reaches bodies of water. ...

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Oligotrophic Lakes
Deep clear lakes with few nutrients, little organic matter and a high dissolv...

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On-Scene Coordinator OSC
The predesignated EPA, Coast Guard, or Department of Defense official who coo...

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On-Site Facility
A hazardous waste treatment, storage or disposal area that is located on the ...

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Onboard Controls
Devices placed on vehicles to capture gasoline vapor during refueling and rou...

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Onconogenicity
The capacity to induce cancer.

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One-hit Model
A mathematical model based on the biological theory that a single "hit" of so...

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Opacity
The amount of light obscured by particulate pollution in the air; clear windo...

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Open Burning
Uncontrolled fires in an open dump.

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Open Dump
An uncovered site used for disposal of waste without environmental controls.

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Operable Unit
Term for each of a number of separate activities undertaken as part of a Supe...

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Operating Conditions
Conditions specified in a RCRA permit that dictate how an incinerator must op...

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Operation and Maintenance
1. Activities conducted after a Superfund site action is completed to ensure ...

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Operator Certification
Certification of operators of community and nontransient noncommunity water s...

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Optimal Corrosion Control Treatment
An erosion control treatment that minimizes the lead and copper concentration...

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Oral Toxicity
Ability of a pesticide to cause injury when ingested.

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Organic
1. Referring to or derived from living organisms. 2. In chemistry, any compou...

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Organic Chemicals
Naturally occuring (animal or plant-produced or synthetic) substances contain...

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Organic Matter
Carbonaceous waste contained in plant or animal matter and originating from d...

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Organism
Any form of animal or plant life.

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Organophosphates
Pesticides that contain phosphorus; short-lived, but some can be toxic when f...

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Organophyllic
A substance that easily combines with organic compounds.

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Organotins
Chemical compounds used in anti-foulant paints to protect the hulls of boats ...

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Original AHERA Inspection
Examination of school buildings arranged by Local Education Agencies to ident...

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Original Generation Point
Where regulated medical or other material first becomes waste.

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Osmosis
The passage of a liquid from a weak solution to a more concentrated solution ...

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Other Ferrous Metals
Recyclable metals from strapping, furniture, and metal found in tires and con...

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Other Glass
Recyclable glass from furniture, appliances, and consumer electronics. Does n...

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Other Nonferrous Metals
Recyclable nonferrous metals such as lead, copper, and zinc from appliances, ...

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Other Paper
For Recyclable paper from books, third-class mail, commercial printing, paper...

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Other Plastics
Recyclable plastic from appliances, eating utensils, plates, containers, toys...

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Other Solid Waste
Recyclable nonhazardous solid wastes, other than municipal solid waste, cover...

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Other Wood
Recyclable wood from furniture, consumer electronics cabinets, and other nonp...

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Outdoor Air Supply
Air brought into a building from outside.

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Outfall
The place where effluent is discharged into receiving waters.

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Overburden
Rock and soil cleared away before mining.

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Overdraft
The pumping of water from a groundwater basin or aquifer in excess of the sup...

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Overfire Air
Air forced into the top of an incinerator or boiler to fan the flames.

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Overflow Rate
One of the guidelines for design of the settling tanks and clarifers in a tre...

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Overland Flow
A land application technique that cleanses waste water by allowing it to flow...

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Oversized Regulated Medical Waste
Medical waste that is too large for plastic bags or standard containers.

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Overturn
One complete cycle of top to bottom mixing of previously stratified water mas...

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Oxidant
A collective term for some of the primary constituents of photochemical smog.

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Oxidation
The chemical addition of oxygen to break down pollutants or organizac waste; ...

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Oxidation Pond
A man-made (anthropogenic) body of water in which waste is consumed by bacter...

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Oxidation-Reduction Potential
The electric potential required to transfer electrons from one compound or el...

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Oxygenated Fuels
Gasoline which has been blended with alcohols or ethers that contain oxygen i...

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Oxygenated Solvent
An organic solvent containing oxygen as part of the molecular structure. Alco...

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Ozonation
Application of ozone to water for disinfection or for taste and odor control....

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Ozone Depletion
Destruction of the stratospheric ozone layer which shields the earth from ult...

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Ozone Hole
A thinning break in the stratospheric ozone layer. Designation of amount of s...

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Ozone Layer
The protective layer in the atmosphere, about 15 miles above the ground, that...

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Ozone O3
Found in two layers of the atmosphere, the stratosphere and the troposphere. ...

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