Laboratory Terms R

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

Analytical testing dots



A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |



126 results match your search term:  R


Radiation
Transmission of energy though space or any medium. Also known as radiant energy.

Find the meaning of the term: Radiation...


Radiation Standards
Regulations that set maximum exposure limits for protection of the public fro...

Find the meaning of the term: Radiation Standards...


Radio Frequency Radiation
non-ionizing electromagnetic radiation.)

Find the meaning of the term: Radio Frequency Radiation...


Radioactive Decay
Spontaneous change in an atom by emission of of charged particles and/or gamm...

Find the meaning of the term: Radioactive Decay...


Radioactive Substances
Substances that emit ionizing radiation.

Find the meaning of the term: Radioactive Substances...


Radioactive Waste
Any waste that emits energy as rays, waves, streams or energetic particles. R...

Find the meaning of the term: Radioactive Waste...


Radioisotopes
Chemical variants of radioactive elements with potentially oncogenic, teratog...

Find the meaning of the term: Radioisotopes...


Radionuclide
Radioactive particle, man-made (anthropogenic) or natural, with a distinct at...

Find the meaning of the term: Radionuclide...


Radius of Influence
1. The radial distance from the center of a wellbore to the point where there...

Find the meaning of the term: Radius of Influence...


Radius of Vulnerability Zone
The maximum distance from the point of release of a hazardous substance in wh...

Find the meaning of the term: Radius of Vulnerability Zone...


Radon
A colorless naturally occurring, radioactive, inert gas formed by radioactive...

Find the meaning of the term: Radon...


Radon Daughters
Short-lived radioactive decay products of radon that decay into longer-lived ...

Find the meaning of the term: Radon Daughters...


Radon Decay Products
A term used to refer collectively to the immediate products of the radon deca...

Find the meaning of the term: Radon Decay Products...


Rainbow Report
Comprehensive document giving the status of all pesticides now or ever in reg...

Find the meaning of the term: Rainbow Report...


Rasp
A machine that grinds waste into a manageable material and helps prevent odor.

Find the meaning of the term: Rasp...


Raw Agricultural Commodity
An unprocessed human food or animal feed crop (e.g., raw carrots, apples, cor...

Find the meaning of the term: Raw Agricultural Commodity...


Raw Sewage
Untreated wastewater and its contents.

Find the meaning of the term: Raw Sewage...


Raw Water
Intake water prior to any treatment or use.

Find the meaning of the term: Raw Water...


Re-entry
(In indoor air program) Refers to air exhausted from a building that is immed...

Find the meaning of the term: Re-entry...


Reactivity
Refers to those hazardous wastes that are normally unstable and readily under...

Find the meaning of the term: Reactivity...


Reaeration
Introduction of air into the lower layers of a reservoir. As the air bubbles ...

Find the meaning of the term: Reaeration...


Real-Time Monitoring
Monitoring and measuring environmental developments with technology and commu...

Find the meaning of the term: Real-Time Monitoring...


Reasonable Further Progress
Annual incremental reductions in air pollutant emissions as reflected in a St...

Find the meaning of the term: Reasonable Further Progress...


Reasonable Maximum Exposure
The maximum exposure reasonably expected to occur in a population.

Find the meaning of the term: Reasonable Maximum Exposure...


Reasonable Worst Case
An estimate of the individual dose, exposure, or risk level received by an in...

Find the meaning of the term: Reasonable Worst Case...


Reasonably Available Control Measures RACM
A broadly defined term referring to technological and other measures for poll...

Find the meaning of the term: Reasonably Available Control Measures RACM...


Reasonably Available Control Technology RACT
Control technology that is reasonably available, and both technologically and...

Find the meaning of the term: Reasonably Available Control Technology RACT...


Recarbonization
Process in which carbon dioxide is bubbled into water being treated to lower ...

Find the meaning of the term: Recarbonization...


Receiving Waters
A river, lake, ocean, stream or other watercourse into which wastewater or tr...

Find the meaning of the term: Receiving Waters...


Receptor
Ecological entity exposed to a stressor.

Find the meaning of the term: Receptor...


Recharge
The process by which water is added to a zone of saturation, usually by perco...

Find the meaning of the term: Recharge...


Recharge Area
A land area in which water reaches the zone of saturation from surface infilt...

Find the meaning of the term: Recharge Area...


Recharge Rate
The quantity of water per unit of time that replenishes or refills an aquifer.

Find the meaning of the term: Recharge Rate...


Reclamation
(In recycling) Restoration of materials found in the waste stream to a benefi...

Find the meaning of the term: Reclamation...


Recombinant Bacteria
A microorganism whose genetic makeup has been altered by deliberate introduct...

Find the meaning of the term: Recombinant Bacteria...


Recombinant DNA
The new DNA that is formed by combining pieces of DNA from different organism...

Find the meaning of the term: Recombinant DNA...


Recommended Maximum Contaminant Level RMCL
The maximum level of a contaminant in drinking water at which no known or ant...

Find the meaning of the term: Recommended Maximum Contaminant Level RMCL...


Reconstructed Source
Facility in which components are replaced to such an extent that the fixed ca...

Find the meaning of the term: Reconstructed Source...


Reconstruction of Dose
Estimating exposure after it has occurred by using evidence within an organis...

Find the meaning of the term: Reconstruction of Dose...


Record of Decision ROD
A public document that explains which cleanup alternative(s) will be used at ...

Find the meaning of the term: Record of Decision ROD...


Recovery Rate
Percentage of usable recycled materials that have been removed from the total...

Find the meaning of the term: Recovery Rate...


Recycle
Minimizing waste generation by recovering and reprocessing usable products th...

Find the meaning of the term: Recycle...


Recycling and Reuse Business Assistance Centers
Located in state solid-waste or economic-development agencies, these centers ...

Find the meaning of the term: Recycling and Reuse Business Assistance Centers...


Recycling Economic Development Advocates
Individuals hired by state or tribal economic development offices to focus fi...

Find the meaning of the term: Recycling Economic Development Advocates...


Recycling Mill
Facility where recovered materials are remanufactured into new products.

Find the meaning of the term: Recycling Mill...


Recycling Technical Assistance Partnership National Network
A national information-sharing resource designed to help businesses and manuf...

Find the meaning of the term: Recycling Technical Assistance Partnership National Network...


Red Border
An EPA document undergoing review before being submitted for final management...

Find the meaning of the term: Red Border...


Red Tide
A proliferation of a marine plankton toxic and often fatal to fish, perhaps s...

Find the meaning of the term: Red Tide...


Redemption Program
Program in which consumers are monetarily compensated for the collection of r...

Find the meaning of the term: Redemption Program...


Reduction
The addition of hydrogen, removal of oxygen, or addition of electrons to an e...

Find the meaning of the term: Reduction...


Reductive Precipitation
This procedure incorporates a chemical separation to remove interfering matri...

Find the meaning of the term: Reductive Precipitation...


Reentry Interval
The period of time immediately following the application of a pesticide durin...

Find the meaning of the term: Reentry Interval...


Reference Dose RfD
The RfD is a numerical estimate of a daily oral exposure to the human populat...

Find the meaning of the term: Reference Dose RfD...


Reformulated Gasoline
Gasoline with a different composition from conventional gasoline (e.g., lower...

Find the meaning of the term: Reformulated Gasoline...


Refueling Emissions
Emissions released during vehicle re-fueling.

Find the meaning of the term: Refueling Emissions...


Refuse Reclamation
Conversion of solid waste into useful products; e.g., composting organic wast...

Find the meaning of the term: Refuse Reclamation...


Regeneration
Manipulation of cells to cause them to develop into whole plants.

Find the meaning of the term: Regeneration...


Regional Response Team RRT
Representatives of federal, local, and state agencies who may assist in coord...

Find the meaning of the term: Regional Response Team RRT...


Registrant
Any manufacturer or formulator who obtains registration for a pesticide activ...

Find the meaning of the term: Registrant...


Registration
Formal listing with EPA of a new pesticide before it can be sold or distribut...

Find the meaning of the term: Registration...


Registration Standards
Published documents which include summary reviews of the data available on a ...

Find the meaning of the term: Registration Standards...


Regulated Asbestos-Containing Material RACM
Friable asbestos material or nonfriable ACM that will be or has been subjecte...

Find the meaning of the term: Regulated Asbestos-Containing Material RACM...


Regulated Medical Waste
Under the Medical Waste Tracking Act of 1988, any solid waste generated in th...

Find the meaning of the term: Regulated Medical Waste...


Relative Ecological Sustainability
Ability of an ecosystem to maintain relative ecological integrity indefinitely.

Find the meaning of the term: Relative Ecological Sustainability...


Relative Permeability
The permeability of a rock to gas, NAIL, or water, when any two or more are p...

Find the meaning of the term: Relative Permeability...


Relative Risk Assessment
Estimating the risks associated with different stressors or management actions.

Find the meaning of the term: Relative Risk Assessment...


Release
Any spilling, leaking, pumping, pouring, emitting, emptying, discharging, inj...

Find the meaning of the term: Release...


Remedial Action RA
The actual construction or implementation phase of a Superfund site cleanup t...

Find the meaning of the term: Remedial Action RA...


Remedial Design
A phase of remedial action that follows the remedial investigation/feasibilit...

Find the meaning of the term: Remedial Design...


Remedial Investigation
An in-depth study designed to gather data needed to determine the nature and ...

Find the meaning of the term: Remedial Investigation...


Remedial Project Manager RPM
The EPA or state official responsible for overseeing on-site remedial action.

Find the meaning of the term: Remedial Project Manager RPM...


Remedial Response
Long-term action that stops or substantially reduces a release or threat of a...

Find the meaning of the term: Remedial Response...


Remediation
1. Cleanup or other methods used to remove or contain a toxic spill or hazard...

Find the meaning of the term: Remediation...


Remote Sensing
The collection and interpretation of information about an object without phys...

Find the meaning of the term: Remote Sensing...


Removal Action
Short-term immediate actions taken to address releases of hazardous substance...

Find the meaning of the term: Removal Action...


Renewable Energy Production Incentive REPI
Incentive established by the Energy Policy Act available to renewable energy ...

Find the meaning of the term: Renewable Energy Production Incentive REPI...


Repeat Compliance Period
Any subsequent compliance period after the initial one.

Find the meaning of the term: Repeat Compliance Period...


Reportable Quantity RQ
Quantity of a hazardous substance that triggers reports under CERCLA. If a su...

Find the meaning of the term: Reportable Quantity RQ...


Repowering
Rebuilding and replacing major components of a power plant instead of buildin...

Find the meaning of the term: Repowering...


Representative Sample
A portion of material or water that is as nearly identical in content and con...

Find the meaning of the term: Representative Sample...


Reregistration
The reevaluation and relicensing of existing pesticides originally registered...

Find the meaning of the term: Reregistration...


Reserve Capacity
Extra treatment capacity built into solid waste and wastewater treatment plan...

Find the meaning of the term: Reserve Capacity...


Reservoir
Any natural or artificial holding area used to store, regulate, or control wa...

Find the meaning of the term: Reservoir...


Residential Use
Pesticide application in and around houses, office buildings, apartment build...

Find the meaning of the term: Residential Use...


Residential Waste
Waste generated in single and multi-family homes, including newspapers, cloth...

Find the meaning of the term: Residential Waste...


Residual
Amount of a pollutant remaining in the environment after a natural or technol...

Find the meaning of the term: Residual...


Residual Risk
The extent of health risk from air pollutants remaining after application of ...

Find the meaning of the term: Residual Risk...


Residual Saturation
Saturation level below which fluid drainage will not occur.

Find the meaning of the term: Residual Saturation...


Residue
The dry solids remaining after the evaporation of a sample of water or sludge.

Find the meaning of the term: Residue...


Resistance
For plants and animals, the ability to withstand poor environmental condition...

Find the meaning of the term: Resistance...


Resource Recovery
The process of obtaining matter or energy from materials formerly discarded.

Find the meaning of the term: Resource Recovery...


Response Action
1. Generic term for actions taken in response to actual or potential health-t...

Find the meaning of the term: Response Action...


Responsiveness Summary
A summary of oral and/or written public comments received by EPA during a com...

Find the meaning of the term: Responsiveness Summary...


Restoration
Measures taken to return a site to pre-violation conditions.

Find the meaning of the term: Restoration...


Restricted Entry Interval
The time after a pesticide application during which entry into the treated ar...

Find the meaning of the term: Restricted Entry Interval...


Restricted Use
A pesticide may be classified (under FIFRA regulations) for restricted use if...

Find the meaning of the term: Restricted Use...


Restriction Enzymes
Enzymes that recognize specific regions of a long DNA molecule and cut it at ...

Find the meaning of the term: Restriction Enzymes...


Retrofit
Addition of a pollution control device on an existing facility without making...

Find the meaning of the term: Retrofit...


Reuse
Using a product or component of municipal solid waste in its original form mo...

Find the meaning of the term: Reuse...


Reverse Osmosis
A treatment process used in water systems by adding pressure to force water t...

Find the meaning of the term: Reverse Osmosis...


Reversible Effect
An effect which is not permanent; especially adverse effects which diminish w...

Find the meaning of the term: Reversible Effect...


Ribonucleic Acid RNA
A molecule that carries the genetic message from DNA to a cellular protein-pr...

Find the meaning of the term: Ribonucleic Acid RNA...


Rigid Porous Polyethylene RPP
Rigid Porous Polyethylene samplers, or RPPs, are made of thin sheets of foam-...

Find the meaning of the term: Rigid Porous Polyethylene RPP...


Rill
A small channel eroded into the soil by surface runoff; can be easily smoothe...

Find the meaning of the term: Rill...


Ringlemann Chart
A series of shaded illustrations used to measure the opacity of air pollution...

Find the meaning of the term: Ringlemann Chart...


Riparian Habitat
Areas adjacent to rivers and streams with a differing density, diversity, and...

Find the meaning of the term: Riparian Habitat...


Riparian Rights
Entitlement of a land owner to certain uses of water on or bordering the prop...

Find the meaning of the term: Riparian Rights...


Risk
A measure of the probability that damage to life, health, property, and/or th...

Find the meaning of the term: Risk...


Risk Assessment
Qualitative and quantitative evaluation of the risk posed to human health and...

Find the meaning of the term: Risk Assessment...


Risk Characterization
The last phase of the risk assessment process that estimates the potential fo...

Find the meaning of the term: Risk Characterization...


Risk Communication
The exchange of information about health or environmental risks among risk as...

Find the meaning of the term: Risk Communication...


Risk Estimate
A description of the probability that organisms exposed to a specific dose of...

Find the meaning of the term: Risk Estimate...


Risk Factor
Characteristics (e.g., race, sex, age, obesity) or variables (e.g., smoking, ...

Find the meaning of the term: Risk Factor...


Risk for Endangered Species
Risk to aquatic species if anticipated pesticide residue levels equal one-fif...

Find the meaning of the term: Risk for Endangered Species...


Risk for Non-Endangered Species
Risk to species if anticipated pesticide residue levels are equal to or great...

Find the meaning of the term: Risk for Non-Endangered Species...


Risk Management
The process of evaluating and selecting alternative regulatory and non-regula...

Find the meaning of the term: Risk Management...


Risk-based Targeting
The direction of resources to those areas that have been identified as having...

Find the meaning of the term: Risk-based Targeting...


Risk-Specific Dose
The dose associated with a specified risk level.

Find the meaning of the term: Risk-Specific Dose...


River Basin
The land area drained by a river and its tributaries.

Find the meaning of the term: River Basin...


Rodenticide
A chemical or agent used to destroy rats or other rodent pests, or to prevent...

Find the meaning of the term: Rodenticide...


Rotary Kiln Incinerator
An incinerator with a rotating combustion chamber that keeps waste moving, th...

Find the meaning of the term: Rotary Kiln Incinerator...


Rough Fish
Fish not prized for sport or eating, such as gar and suckers. Most are more t...

Find the meaning of the term: Rough Fish...


Route of Exposure
The avenue by which a chemical comes into contact with an organism, e.g., inh...

Find the meaning of the term: Route of Exposure...


Rubbish
Solid waste, excluding food waste and ashes, from homes, institutions, and wo...

Find the meaning of the term: Rubbish...


Run-Off
That part of precipitation, snow melt, or irrigation water that runs off the ...

Find the meaning of the term: Run-Off...


Running Losses
Evaporation of motor vehicle fuel from the fuel tank while the vehicle is in ...

Find the meaning of the term: Running Losses...




Analytical testing dots