LC20 definition

LC20 is the concentration of effluent in water that is estimated to be lethal to 20% of the test organisms. The LC20 and its 95% confidence limits are usually derived by statistical analysis of percent mortalities in several test concentrations, after a fixed period of exposure. The duration of exposure must be specified (e.g., 48-h LC20).
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Examples of LC20 in a sentence

  • The Raw Sewage Premium will be SIX ($6.00) DOLLARS times the applicable hourly allotment, and LC:20 - Retirement Incentive will be implemented effective October 1st, 1989.

  • Under Part J, item 5.(a), DDMI is also required to develop a revised Contingency Plan in the event that toxicity tests exceed the LC20 threshold.

  • In accordance with Section 10 of the Record of Agreement, DDMI shall conduct monitoring of LC20 values for toxicity tests required under Part B, item 12 of the ‘Surveillance Network Program’.

  • Upon implementation of the protocol the LC20 monitoring under Part B, Item 12 (a) of the “Surveillance Network Program,” and associated LC20 contingency triggers and measures under Part J, Item 5 (a) and (b) of the Water License, shall be removed on Board approval.

  • LC:20 shall apply to the following List of Employees and Retirees only: 2820-50697 - ▇.

  • Responses of the test organisms were too small to es- tablish reliable LC-20 or LC-50 values.