Acute toxic unit definition

Acute toxic unit or "TUa" means 100/LC50 where the LC50 is expressed as a percent effluent in the test medium of an acute whole effluent toxicity (WET) test that is statistically or graphically estimated to be lethal to fifty percent (50%) of the test organisms.
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Examples of Acute toxic unit in a sentence

  • Acute toxic unit (TUa) means 100/LC50 where the LC50 is determined from a whole effluent toxicity (WET) test which produces a result that is statistically or graphically estimated to be lethal to 50% of the test organisms.

  • An LC50/EC50 (lethal/immobile concentration) less than or equal to 100 percent effluent constitutes a positive for toxicity.7.2 "Acute toxic unit (TUa)" is the reciprocal of the effluent dilution that causes the acute effect by the end of the acute exposure period.

  • Acute toxic unit (TUA) means 100/LC50 where the LC50 is determined from a whole effluent toxicity (WET) test which produces a result that is statistically or graphically estimated to be lethal to 50% of the test organisms.

  • Acute toxic unit (TUa) means 100/LCso where the LCso is determined from a whole effluent toxicity (WET) test which produces a result that is statistically or graphically estimated to be lethal to 50% ofthe test organisms.

  • Acute toxic unit (TUA) means 100/LC50 where the LC50 is determined from a whole effluent toxicity (WET) test which produces a result that is statistically or graphically estimated to be lethal to 50 percent of the test organisms.

Related to Acute toxic unit

  • Acute toxicity means concurrent and delayed adverse effects that result from an acute exposure and occur within any short observation period, which begins when the exposure begins, may extend beyond the exposure period, and usually does not constitute a substantial portion of the life span of the organism.

  • Toxic chemical means a chemical or chemical category listed in 40 CFR 372.65.

  • toxic substances as defined by the Toxic Substances Control Act, as amended from time to time (“TSCA”), (4) “hazardous materials” as defined by the Hazardous Materials Transportation Act, as amended from time to time (“HMTA”), (5) asbestos, oil or other petroleum products, radioactive materials, urea formaldehyde foam insulation, radon gas and transformers or other equipment that contains dielectric fluid containing polychlorinated biphenyls and (6) any substance whose presence is detrimental or hazardous to health or the environment, including, without limitation, microbial or fungal matter or mold, or is otherwise regulated by federal, state and local environmental laws (including, without limitation, RCRA, CERCLA, TSCA, HMTA), rules, regulations and orders, regulating, relating to or imposing liability or standards of conduct concerning any Hazardous Materials or environmental, health or safety compliance (collectively, “Environmental Requirements”). As used in this Contract: “Release” means spilling, leaking, pumping, pouring, emitting, emptying, discharging, injecting, escaping, leaching, dumping or disposing.

  • Radioactive waste means radioactive waste as defined in Article 3(7) of Council Directive 2011/70/Euratom8;

  • Gaseous pollutants means the exhaust gas emissions of carbon monoxide, oxides of nitrogen expressed in nitrogen dioxide (NO2) equivalent and hydrocarbons assuming ratio of: