ainesisaldus, mis kahjustab keskmiselt pooli katseorganismidest
the concentration which affects 50 % of a test population after a specified exposure time; usually relates to effects other than lethality (e.g. immobilization, growth rate, equilibrium, development abnormality or deformity)
The PNEC shall be calculated by applying an assessment factor to the values resulting from tests on organisms, e.g. LD50 (median lethal dose), LC50 (median lethal concentration), EC50 (median effective concentration), IC50 (concentration causing 50 % inhibition of a given parameter, e.g. growth), NOEL(C) (no-observed-effect level(concentration)), or LOEL(C) (lowest-observed-effect level (concentration)).
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