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| Term | Definition | Article | Siehe auch |
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| EC50: Wikipedia: EC50 |
(Effective Concentration) The concentration of a substance in a surrounding medium [g/l in water], at which 50 percent of the tested aquatic organisms show a difined effect level (e.g. reproduction, O2 produxtion). Analogous definitions apply to EC10, EC5, etc. with corresponding effect levels. | LC50 |