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.
- Tailings
- Residue of raw material or waste separated out during the processing of crops...
- Tailpipe Standards
- Emissions limitations applicable to mobile source engine exhausts.
- Tampering
- Adjusting, negating, or removing pollution control equipment on a motor vehicle.
- Technical Assistance Grant TAG
- As part of the Superfund program, Technical Assistance Grants of up to $50,00...
- Technical-Grade Active Ingredient TGA
- A pesticide chemical in pure form as it is manufactured prior to being formul...
- Technology-Based Limitations
- Industry-specific effluent limitations based on best available preventive tec...
- Technology-Based Standards
- Industry-specific effluent limitations applicable to direct and indirect sour...
- Tentatively Identified Compounds TICs
- TICs or Tentatively Identified Compounds are those which can be detected by a...
- Teratogen
- A substance capable of causing birth defects.
- Teratogenesis
- The introduction of nonhereditary birth defects in a developing fetus by exog...
- Terracing
- Dikes built along the contour of sloping farm land that hold runoff and sedim...
- Tertiary Treatment
- Advanced cleaning of wastewater that goes beyond the secondary or biological ...
- Theoretical Maximum Residue Contribution
- The theoretical maximum amount of a pesticide in the daily diet of an average...
- Therapeutic Index
- The ratio of the dose required to produce toxic or lethal effects to the dose...
- Thermal Pollution
- Discharge of heated water from industrial processes that can kill or injure a...
- Thermal Stratification
- The formation of layers of different temperatures in a lake or reservoir.
- Thermal System Insulation TSI
- Asbestos-containing material applied to pipes, fittings, boilers, breeching, ...
- Thermal Treatment
- Use of elevated temperatures to treat hazardous wastes.
- Thermocline
- The middle layer of a thermally stratified lake or reservoir. In this layer, ...
- Threshold
- The lowest dose of a chemical at which a specified measurable effect is obser...
- Threshold Level
- Time-weighted average pollutant concentration values, exposure beyond which i...
- Threshold Limit Value TLV
- The concentration of an airborne substance to which an average person can be ...
- Threshold Planning Quantity
- A quantity designated for each chemical on the list of extremely hazardous su...
- Thropic Levels
- A functional classification of species that is based on feeding relationships...
- Tidal Marsh
- Low, flat marshlands traversed by channels and tidal hollows, subject to tida...
- Tillage
- Plowing, seedbed preparation, and cultivation practices.
- Time-weighted Average TWA
- In air sampling, the average air concentration of contaminants during a given...
- Tire Processor
- Intermediate operating facility where recovered tires are processed in prepar...
- Tires
- As used in recycling, passenger car and truck tires (excludes airplane, bus, ...
- Tolerance Petition
- A formal request to establish a new tolerance or modify an existing one.
- Tolerances
- Permissible residue levels for pesticides in raw agricultural produce and pro...
- Tonnage
- The amount of waste that a landfill accepts, usually expressed in tons per mo...
- Topography
- The physical features of a surface area including relative elevations and the...
- Total Dissolved Phosphorous
- The total phosphorous content of all material that will pass through a filter...
- Total Dissolved Solids TDS
- All material that passes the standard glass river filter; now called total fi...
- Total Petroleum Hydrocarbons TPH
- Measure of the concentration or mass of petroleum hydrocarbon constituents pr...
- Total Pressure
- In flowing air, the sum of the static and velocity pressures.
- Total Recovered Petroleum Hydrocarbon
- A method for measuring petroleum hydrocarbons in samples of soil or water.
- Total Suspended Particles TSP
- A method of monitoring airborne particulate matter by total weight.
- Total Suspended Solids TSS
- A measure of the suspended solids in wastewater, effluent, or water bodies, d...
- Total Trihalomethanes TTHM
- Total Trihalomethanes (TTHM) are the total amount of trihalomethanes allowed ...
- Toxaphene
- Chemical that causes adverse health effects in domestic water supplies and is...
- Toxic Chemical
- Any chemical listed in EPA rules as "Toxic Chemicals Subject to Section 313 o...
- Toxic Chemical Release Form
- Information form required of facilities that manufacture, process, or use (in...
- Toxic Chemical Use Substitution
- Replacing toxic chemicals with less harmful chemicals in industrial processes.
- Toxic Cloud
- Airborne plume of gases, vapors, fumes, or aerosols containing toxic materials.
- Toxic Concentration
- The concentration at which a substance produces a toxic effect.
- Toxic Dose
- The dose level at which a substance produces a toxic effect.
- Toxic Pollutants
- Materials that cause death, disease, or birth defects in organisms that inges...
- Toxic Release Inventory
- Database of toxic releases in the United States compiled from SARA Title III ...
- Toxic Substance
- A chemical or mixture that may present an unreasonable risk of injury to heal...
- Toxic Waste
- A waste that can produce injury if inhaled, swallowed, or absorbed through th...
- Toxicant
- A harmful substance or agent that may injure an exposed organism.
- Toxicity
- The degree to which a substance or mixture of substances can harm humans or a...
- Toxicity Assessment
- Characterization of the toxicological properties and effects of a chemical, w...
- Toxicity Testing
- Biological testing (usually with an invertebrate, fish, or small mammal) to d...
- Toxicological Profile
- An examination, summary, and interpretation of a hazardous substance to deter...
- Transboundary Pollutants
- Air pollution that travels from one jurisdiction to another, often crossing s...
- Transfer Station
- Facility where solid waste is transferred from collection vehicles to larger ...
- Transient Water System
- A non-community water system that does not serve 25 of the same nonresidents ...
- Transmission Lines
- Pipelines that transport raw water from its source to a water treatment plant...
- Transmissivity
- The ability of an aquifer to transmit water.
- Transpiration
- The process by which water vapor is lost to the atmosphere from living plants...
- Transportation Control Measures TCMs
- Steps taken by a locality to reduce vehicular emission and improve air qualit...
- Transporter
- Hauling firm that picks up properly packaged and labeled hazardous waste from...
- Trash
- Material considered worthless or offensive that is thrown away. Generally def...
- Trash-to-Energy Plan
- Burning trash to produce energy.
- Treatability Studies
- Tests of potential cleanup technologies conducted in a laboratory
- Treated Regulated Medical Waste
- Medical waste treated to substantially reduce or eliminate its pathogenicity,...
- Treated Wastewater
- Wastewater that has been subjected to one or more physical, chemical, and bio...
- Treatment
- (1) Any method, technique, or process designed to remove solids and/or pollut...
- Treatment Plant
- A structure built to treat wastewater before discharging it into the environm...
- Treatment Storage and Disposal Facility
- Site where a hazardous substance is treated, stored, or disposed of. TSD faci...
- Tremie
- Device used to place concrete or grout under water.
- Trial Burn
- An incinerator test in which emissions are monitored for the presence of spec...
- Trichloroethylene TCE
- A stable, low boiling-point colorless liquid, toxic if inhaled. Used as a sol...
- Trickle Irrigation
- Method in which water drips to the soil from perforated tubes or emitters.
- Trickling Filter
- A coarse treatment system in which wastewater is trickled over a bed of stone...
- Trihalomethanes THM
- Trihalomethanes (THM) is a family of organic compounds named as derivative of...
- Troposhpere
- The layer of the atmosphere closest to the earth's surface.
- Trust Fund
- A fund set up under the Comprehensive Environmental Response, Compensation an...
- Tube Settler
- Device using bundles of tubes to let solids in water settle to the bottom for...
- Tuberculation
- Development or formation of small mounds of corrosion products on the inside ...
- Tundra
- A type of treeless ecosystem dominated by lichens, mosses, grasses, and woody...
- Turbidimeter
- A device that measures the cloudiness of suspended solids in a liquid; a meas...
- Turbidity
- 1. Haziness in air caused by the presence of particles and pollutants. 2. A c...
Find the meaning of the term: Tail Water...
Find the meaning of the term: Tailings...
Find the meaning of the term: Tailpipe Standards...
Find the meaning of the term: Tampering...
Find the meaning of the term: Technical Assistance Grant TAG...
Find the meaning of the term: Technical-Grade Active Ingredient TGA...
Find the meaning of the term: Technology-Based Limitations...
Find the meaning of the term: Technology-Based Standards...
Find the meaning of the term: Tentatively Identified Compounds TICs...
Find the meaning of the term: Teratogen...
Find the meaning of the term: Teratogenesis...
Find the meaning of the term: Terracing...
Find the meaning of the term: Tertiary Treatment...
Find the meaning of the term: Theoretical Maximum Residue Contribution...
Find the meaning of the term: Therapeutic Index...
Find the meaning of the term: Thermal Pollution...
Find the meaning of the term: Thermal Stratification...
Find the meaning of the term: Thermal System Insulation TSI...
Find the meaning of the term: Thermal Treatment...
Find the meaning of the term: Thermocline...
Find the meaning of the term: Threshold...
Find the meaning of the term: Threshold Level...
Find the meaning of the term: Threshold Limit Value TLV...
Find the meaning of the term: Threshold Planning Quantity...
Find the meaning of the term: Thropic Levels...
Find the meaning of the term: Tidal Marsh...
Find the meaning of the term: Tillage...
Find the meaning of the term: Time-weighted Average TWA...
Find the meaning of the term: Tire Processor...
Find the meaning of the term: Tires...
Find the meaning of the term: Tolerance Petition...
Find the meaning of the term: Tolerances...
Find the meaning of the term: Tonnage...
Find the meaning of the term: Topography...
Find the meaning of the term: Total Dissolved Phosphorous...
Find the meaning of the term: Total Dissolved Solids TDS...
Find the meaning of the term: Total Petroleum Hydrocarbons TPH...
Find the meaning of the term: Total Pressure...
Find the meaning of the term: Total Recovered Petroleum Hydrocarbon...
Find the meaning of the term: Total Suspended Particles TSP...
Find the meaning of the term: Total Suspended Solids TSS...
Find the meaning of the term: Total Trihalomethanes TTHM...
Find the meaning of the term: Toxaphene...
Find the meaning of the term: Toxic Chemical...
Find the meaning of the term: Toxic Chemical Release Form...
Find the meaning of the term: Toxic Chemical Use Substitution...
Find the meaning of the term: Toxic Cloud...
Find the meaning of the term: Toxic Concentration...
Find the meaning of the term: Toxic Dose...
Find the meaning of the term: Toxic Pollutants...
Find the meaning of the term: Toxic Release Inventory...
Find the meaning of the term: Toxic Substance...
Find the meaning of the term: Toxic Waste...
Find the meaning of the term: Toxicant...
Find the meaning of the term: Toxicity...
Find the meaning of the term: Toxicity Assessment...
Find the meaning of the term: Toxicity Testing...
Find the meaning of the term: Toxicological Profile...
Find the meaning of the term: Transboundary Pollutants...
Find the meaning of the term: Transfer Station...
Find the meaning of the term: Transient Water System...
Find the meaning of the term: Transmission Lines...
Find the meaning of the term: Transmissivity...
Find the meaning of the term: Transpiration...
Find the meaning of the term: Transportation Control Measures TCMs...
Find the meaning of the term: Transporter...
Find the meaning of the term: Trash...
Find the meaning of the term: Trash-to-Energy Plan...
Find the meaning of the term: Treatability Studies...
Find the meaning of the term: Treated Regulated Medical Waste...
Find the meaning of the term: Treated Wastewater...
Find the meaning of the term: Treatment...
Find the meaning of the term: Treatment Plant...
Find the meaning of the term: Treatment Storage and Disposal Facility...
Find the meaning of the term: Tremie...
Find the meaning of the term: Trial Burn...
Find the meaning of the term: Trichloroethylene TCE...
Find the meaning of the term: Trickle Irrigation...
Find the meaning of the term: Trickling Filter...
Find the meaning of the term: Trihalomethanes THM...
Find the meaning of the term: Troposhpere...
Find the meaning of the term: Trust Fund...
Find the meaning of the term: Tube Settler...
Find the meaning of the term: Tuberculation...
Find the meaning of the term: Tundra...
Find the meaning of the term: Turbidimeter...
Find the meaning of the term: Turbidity...