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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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 waste or "toxic substance" under any provision of Environmental Law and shall also include, without limitation, petroleum, petroleum products, asbestos, polychlorinated biphenyls and radioactive materials;

  • Toxic Substance includes but is not limited to asbestos, polychlorinated biphenyls (PCBs) and lead-based paints.

  • Irritant means any substance, other than a corrosive, that on