acceptable toxicant concentration (MATC) is calculated as the geometric mean of the NOEC and LOEC. MATC is sometimes called the chronic value (CV) and defined as "the concentration (threshold) at which chronic effects are first observed".

PEC/PNEC

The predicted no effects concentration (PNEC) is calculated from toxicity tests to determine the concentration that is not thought to cause adverse effects to aquatic organisms. Determination of aquatic PNEC values requires

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