The LC50 is the concentration of a toxicant in the air or in a body of water that will kill half of a test animal population, typically expressed in parts per million (ppm) or parts per billion (ppb). If you would like more information on this subject read Toxicity of Pesticiees from Cornell University ( http://psep.cce.cornell.edu/Tutorials/core-tutorial/module04/index.aspx ).
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