Reference Concentration definition

Reference Concentration or “RfC” means an estimate of a daily exposure, in units of milligrams of chemical per cubic meter of air (mg/m3), to the human population (including sensitive subgroups) that is likely to be without appreciable risk of deleterious effects during a portion of a lifetime (up to approximately seven years, subchronic) or for a lifetime (chronic).
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Reference Concentration means a verified reference concentration developed by the United States environmental pro- tection agency which is an estimate of an exposure of the human population, including sensitive subgroups, to a hazardous air con- taminant that is likely to be without an appreciable risk of deleteri- ous effects during a lifetime. A reference concentration is based on continuous inhalation exposures to the hazardous air contami- nant and is expressed in units of micrograms per cubic meter (µg/m3).
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Reference Concentration or "RfC" means an estimate, with uncertainty spanning an order of magnitude, of a continuous inhalation exposure to the human population, including sensitive subgroups, that is likely to be without appreciable risk of deleterious effects during a lifetime. It can be derived from a NOAEL, LOAEL, or BMD, with UFs generally applied to reflect limitations of the data used.
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Examples of Reference Concentration in a sentence

  • Reference concentration" is an estimate of a continuous inhalation exposure to the human population (including sensitive subgroups) that is likely to be without an appreciable risk of deleterious effects during a lifetime.

  • Especially the three-dimensionality of the exploration process requires techniques, which are capable to record the full 3D scenes with video frequency.

  • In this case, the Acute EMEG is equal to the EPA’s Reference concentration.

  • Reference concentration of Dynabeads stated in the results section is the expected concentration of Dynabeads in the sample derived from dilution calculations and the original bead concentration stated by the manufacturer.

  • Reference concentration for chronic inhalation exposure (RfC) for triethylamine.

  • SCDM Section 2.2.1 states the following: Inhalation data in IRIS are given as reference concentrations (RfCs) equivalent to dose rather than RfDs. RfCs are converted to RfDs by the following equation: 1.2-26RfD = RfC × IR × AR (1) BW × 100 Where:RfC = Reference concentration in air (mg/m3) IR = Inhalation rate (20 m3/day)AR4 = Absorption rate (%)BW = Adult body weight (70 kg).

  • Article 338: The fine stipulated in Article 338 was amended by Article 24 of Act 239 of 27 May 1993, as follows: All secret societies shall be dissolved and their assets confiscated.

  • Reference concentration (RfC)A concentration specified by USEPA to limit human inhalation exposure to potentially hazardous levels of chemicals in air (Commission 1997a).

  • Hazard Quotient = C/RfC where: C = Maximum annual average ambient air concentration from AERMOD (μg/m3), of the unique toxic air pollutant RfC = Reference concentration (μg/m3), of the unique toxic air pollutant.

  • The DWM occupational receptor is identified in the EPA RSLs as the “composite worker” receptorRSL = USEPA Superfund Program Regional Screening Levels, accessed at: https://www.epa.gov/risk/regional-screening-levels- rslsHQ = Hazard Quotient = (exposure concentration/screening level) RfC = Reference concentration ATSDR 2014a.


More Definitions of Reference Concentration

Reference Concentration means an estimate of a continuous exposure or a daily exposure to the human population (including sensitive populations) that is likely to be without an appreciable risk of adverse non-cancer effects during a lifetime. The reference concentration can be derived from various types of human or animal data, with uncertainty factors generally applied to reflect limitations of the data used.
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Reference Concentration or “(RfC)" means an estimate of a daily exposure, in units of milligrams of chemical per cubic meter of air (mg/m(3)), to the human
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Reference Concentration or “S(SRfCS) means an estimate of a daily exposure, in
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Reference Concentration or “RfC” means an estimate of the continuous inhalation exposure to the human population, including sensitive subgroups and lifestages, that is likely to be without appreciable risk of adverse effect during a lifetime. The reference concentration is expressed in units of micrograms of hazardous substance per cubic meter of air.
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Related to Reference Concentration

  • Net concentration means the difference between the concentration of a given substance in a sample taken of the discharge and the concentration of the same substances in a sample taken at the intake which supplies water to the given process. For the purpose of this definition, samples that are taken to determine the net concentration shall always be 24-hour composite samples made up of at least six increments taken at regular intervals throughout the plant day.

  • Baseline concentration means that ambient concentration level that exists in the baseline area at the time of the applicable minor source baseline date. A baseline concentration is deter- mined for each pollutant for which a minor source baseline date is estab- lished and shall include:

  • Alcohol concentration means the number of grams of alcohol per:

  • median concentration means that half of the homes in a county are expected to be below this value and half to be above it. All houses contain some radon, and a few houses will contain much more than the median concentration. The only way to accurately assess long-term exposure to radon in a specific house is through long-term testing (sampling the indoor air for a year or more). The EPA recommends that all homes be tested for radon. Columbia University's "Radon Project" website offers help to homeowners in assessing the cost vs. benefit of testing a specific house for radon or modifying it for radon reduction (see http://www.stat.columbia.edu/~radon/).

  • Excess Concentration Amount means, as of any date of determination on which any one or more of the Concentration Limitations are exceeded, an amount (calculated by the Servicer and without duplication) equal to the Dollar Equivalent of the portion of the Adjusted Principal Balance of each Eligible Collateral Loan that causes such Concentration Limitation to be exceeded.

  • Daily Concentration means the concentration of a substance as measured in a daily composite sample, or, arithmetic average of all grab sample results defining a grab sample average.

  • Critical Test Concentration or "(CTC)" means the specified effluent dilution at which the Permittee is to conduct a single-concentration Aquatic Toxicity Test.

  • Background concentration means such concentration of that substance as is present in:

  • Concentration means the weight of any given material present in a unit volume of liquid. Unless otherwise indicated in this permit, concentration values shall be expressed in milligrams per liter (mg/l).

  • Derived air concentration (DAC) means the concentration of a given radionuclide in air which, if breathed by the reference man for a working year of 2,000 hours under conditions of light work, results in an intake of one ALI. For purposes of these regulations, the condition of light work is an inhalation rate of 1.2 cubic meters of air per hour for 2,000 hours in a year. DAC values are given in Part 4, Appendix 4B, Table 4B1, Column 3.

  • Residual disinfectant concentration (“C” in CT calculations) means the concentration of disinfectant measured in mg/l in a representative sample of water.

  • In-stream Waste Concentration or "(IWC)" means the concentration of a discharge in the receiving water after mixing has occurred in the allocated zone of influence.

  • Reference Value means the last reported sales price of the shares of Common Stock for any twenty (20) trading days within the thirty (30) trading-day period ending on the third trading day prior to the date on which notice of the redemption is given.

  • iron ore concentrates means products (whether in pellet or other form) resulting from secondary processing but does not include metallised agglomerates;

  • Reference Gilt means the Treasury Stock specified as such in the relevant Final Terms for so long as such stock is in issue, and thereafter such issue of index-linked Treasury Stock determined to be appropriate by a gilt-edged market maker or other adviser selected by the Issuer (an “Indexation Adviser”).

  • Reference Entity means with respect to a Synthetic Security, the Obligor to whose credit such Synthetic Security is linked and the Obligor under any Reference Obligation specified in such Synthetic Security.

  • Reference Index means each of the indices comprising the Reference Portfolio.

  • Reference Day means each Business Day in the relevant Interest Period, other than any Business Day in the Lock-out Period;

  • Reference Level means the level of the Index (excluding any flash estimates) published or announced by Eurostat (or any successor entity which publishes such index) in respect of the month that is 12 calendar months prior to the month referred to in “Latest Level” above.