Laboratory Terms T

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

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87 results match your search term:  T


Tail Water
The runoff of irrigation water from the lower end of an irrigated field.

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Tailings
Residue of raw material or waste separated out during the processing of crops...

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Tailpipe Standards
Emissions limitations applicable to mobile source engine exhausts.

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Tampering
Adjusting, negating, or removing pollution control equipment on a motor vehicle.

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Technical Assistance Grant TAG
As part of the Superfund program, Technical Assistance Grants of up to $50,00...

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Technical-Grade Active Ingredient TGA
A pesticide chemical in pure form as it is manufactured prior to being formul...

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Technology-Based Limitations
Industry-specific effluent limitations based on best available preventive tec...

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Technology-Based Standards
Industry-specific effluent limitations applicable to direct and indirect sour...

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Tentatively Identified Compounds TICs
TICs or Tentatively Identified Compounds are those which can be detected by a...

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Teratogen
A substance capable of causing birth defects.

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Teratogenesis
The introduction of nonhereditary birth defects in a developing fetus by exog...

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Terracing
Dikes built along the contour of sloping farm land that hold runoff and sedim...

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Tertiary Treatment
Advanced cleaning of wastewater that goes beyond the secondary or biological ...

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Theoretical Maximum Residue Contribution
The theoretical maximum amount of a pesticide in the daily diet of an average...

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Therapeutic Index
The ratio of the dose required to produce toxic or lethal effects to the dose...

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Thermal Pollution
Discharge of heated water from industrial processes that can kill or injure a...

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Thermal Stratification
The formation of layers of different temperatures in a lake or reservoir.

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Thermal System Insulation TSI
Asbestos-containing material applied to pipes, fittings, boilers, breeching, ...

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Thermal Treatment
Use of elevated temperatures to treat hazardous wastes.

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Thermocline
The middle layer of a thermally stratified lake or reservoir. In this layer, ...

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Threshold
The lowest dose of a chemical at which a specified measurable effect is obser...

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Threshold Level
Time-weighted average pollutant concentration values, exposure beyond which i...

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Threshold Limit Value TLV
The concentration of an airborne substance to which an average person can be ...

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Threshold Planning Quantity
A quantity designated for each chemical on the list of extremely hazardous su...

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Thropic Levels
A functional classification of species that is based on feeding relationships...

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Tidal Marsh
Low, flat marshlands traversed by channels and tidal hollows, subject to tida...

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Tillage
Plowing, seedbed preparation, and cultivation practices.

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Time-weighted Average TWA
In air sampling, the average air concentration of contaminants during a given...

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Tire Processor
Intermediate operating facility where recovered tires are processed in prepar...

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Tires
As used in recycling, passenger car and truck tires (excludes airplane, bus, ...

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Tolerance Petition
A formal request to establish a new tolerance or modify an existing one.

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Tolerances
Permissible residue levels for pesticides in raw agricultural produce and pro...

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Tonnage
The amount of waste that a landfill accepts, usually expressed in tons per mo...

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Topography
The physical features of a surface area including relative elevations and the...

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Total Dissolved Phosphorous
The total phosphorous content of all material that will pass through a filter...

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Total Dissolved Solids TDS
All material that passes the standard glass river filter; now called total fi...

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Total Petroleum Hydrocarbons TPH
Measure of the concentration or mass of petroleum hydrocarbon constituents pr...

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Total Pressure
In flowing air, the sum of the static and velocity pressures.

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Total Recovered Petroleum Hydrocarbon
A method for measuring petroleum hydrocarbons in samples of soil or water.

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Total Suspended Particles TSP
A method of monitoring airborne particulate matter by total weight.

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Total Suspended Solids TSS
A measure of the suspended solids in wastewater, effluent, or water bodies, d...

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Total Trihalomethanes TTHM
Total Trihalomethanes (TTHM) are the total amount of trihalomethanes allowed ...

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Toxaphene
Chemical that causes adverse health effects in domestic water supplies and is...

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Toxic Chemical
Any chemical listed in EPA rules as "Toxic Chemicals Subject to Section 313 o...

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Toxic Chemical Release Form
Information form required of facilities that manufacture, process, or use (in...

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Toxic Chemical Use Substitution
Replacing toxic chemicals with less harmful chemicals in industrial processes.

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Toxic Cloud
Airborne plume of gases, vapors, fumes, or aerosols containing toxic materials.

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Toxic Concentration
The concentration at which a substance produces a toxic effect.

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Toxic Dose
The dose level at which a substance produces a toxic effect.

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Toxic Pollutants
Materials that cause death, disease, or birth defects in organisms that inges...

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Toxic Release Inventory
Database of toxic releases in the United States compiled from SARA Title III ...

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Toxic Substance
A chemical or mixture that may present an unreasonable risk of injury to heal...

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Toxic Waste
A waste that can produce injury if inhaled, swallowed, or absorbed through th...

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Toxicant
A harmful substance or agent that may injure an exposed organism.

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Toxicity
The degree to which a substance or mixture of substances can harm humans or a...

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Toxicity Assessment
Characterization of the toxicological properties and effects of a chemical, w...

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Toxicity Testing
Biological testing (usually with an invertebrate, fish, or small mammal) to d...

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Toxicological Profile
An examination, summary, and interpretation of a hazardous substance to deter...

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Transboundary Pollutants
Air pollution that travels from one jurisdiction to another, often crossing s...

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Transfer Station
Facility where solid waste is transferred from collection vehicles to larger ...

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Transient Water System
A non-community water system that does not serve 25 of the same nonresidents ...

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Transmission Lines
Pipelines that transport raw water from its source to a water treatment plant...

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Transmissivity
The ability of an aquifer to transmit water.

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Transpiration
The process by which water vapor is lost to the atmosphere from living plants...

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Transportation Control Measures TCMs
Steps taken by a locality to reduce vehicular emission and improve air qualit...

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Transporter
Hauling firm that picks up properly packaged and labeled hazardous waste from...

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Trash
Material considered worthless or offensive that is thrown away. Generally def...

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Trash-to-Energy Plan
Burning trash to produce energy.

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Treatability Studies
Tests of potential cleanup technologies conducted in a laboratory

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Treated Regulated Medical Waste
Medical waste treated to substantially reduce or eliminate its pathogenicity,...

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Treated Wastewater
Wastewater that has been subjected to one or more physical, chemical, and bio...

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Treatment
(1) Any method, technique, or process designed to remove solids and/or pollut...

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Treatment Plant
A structure built to treat wastewater before discharging it into the environm...

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Treatment Storage and Disposal Facility
Site where a hazardous substance is treated, stored, or disposed of. TSD faci...

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Tremie
Device used to place concrete or grout under water.

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Trial Burn
An incinerator test in which emissions are monitored for the presence of spec...

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Trichloroethylene TCE
A stable, low boiling-point colorless liquid, toxic if inhaled. Used as a sol...

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Trickle Irrigation
Method in which water drips to the soil from perforated tubes or emitters.

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Trickling Filter
A coarse treatment system in which wastewater is trickled over a bed of stone...

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Trihalomethanes THM
Trihalomethanes (THM) is a family of organic compounds named as derivative of...

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Troposhpere
The layer of the atmosphere closest to the earth's surface.

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Trust Fund
A fund set up under the Comprehensive Environmental Response, Compensation an...

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Tube Settler
Device using bundles of tubes to let solids in water settle to the bottom for...

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Tuberculation
Development or formation of small mounds of corrosion products on the inside ...

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Tundra
A type of treeless ecosystem dominated by lichens, mosses, grasses, and woody...

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Turbidimeter
A device that measures the cloudiness of suspended solids in a liquid; a meas...

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Turbidity
1. Haziness in air caused by the presence of particles and pollutants. 2. A c...

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