Anchor: 1 The objective of chronic aquatic toxicity tests with effluents and pure compounds is to estimate the highest safe or no-effect concentration of these substances.
Entailed: Finding the highest safe concentration of substances is what chronic aquatic toxicity tests are designed to do.
Contradiction: Chronic aquatic toxicity tests are about finding the lowest no-effect concentration of the substances.
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Contradiction: Sir, we know everything about this topic.
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