Abstract
Static bioassays, although widely used in evaluating the effects of toxins in aquatic environments, provide rather imprecise data, especially when used with relatively insoluble toxins. A mathematical model of such a system was developed, assuming only first order chemical kinetics. The model was tested using DDT as toxin and stoneflies as assay organisms. Monitoring of DDT concentrations in test and control aquaria and fitting the data to the model permitted the calculation of mean dosage per insect, thus yielding relatively precise and useful toxicological information.
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