![]() Results were compared to the national final chronic value (FCV) for copper and zinc. The test sensitivity more » was examined by calculation of the minimum significant difference (e.g. Data was used if the tests met the specified test acceptability criteria. Data from the EPA`s Reference Toxicant Database were used in the analysis. The levels of intra and interlaboratory precision with two reference toxicants (zinc and copper) were examined with six marine test species (Macrocystis pyrifera, Haliotis rufescens, Strongylocentrotus purpuratus, Dendraster excentricus, Mytilus spp., and Menidia beryllina) and with two freshwater test species (Ceriodaphnia dubia and Pimephales promelas). The US Environmental Protection Agency`s test method manuals recommend reference toxicant test be performed to determine test sensitivity and precision within a test and among tests over time. ![]() The non-parametric models, trimmed Spearman-Karber, IC, The probit model frequently does not fit the concentration-response curve of NPDES toxicity test data and non-parametric models must be used instead.
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