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Box 2.2 Definitions

Acute toxicity – adverse effect on an organism after short-term exposure.

Chronic toxicity – adverse long-term effect after long-term exposure (typically at lower concentrations than those causing acute toxicity).

Mixture toxicity – adverse combined effect after exposure to multiple pollutants

Mode of action – understanding of how a chemical acts in an organism or ecosystem

Bioassay – biological test system (organism or cells)

Effect based method (EBM) – bioassay suitable for environmental monitoring 

Molecular target  - biomolecule (e.g. protein) that directly interacts / binds with a chemical
 

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