In order to validate a classfication system for the prediction of the toxic eect concentrations of organic environmental
pollutants to ®sh, all available ®sh acute toxicity data were retrieved from the ECETOC database, a database
of quality-evaluated aquatic toxicity measurements created and maintained by the European Centre for the Ecotoxicology
and Toxicology of Chemicals. The individual chemicals for which these data were available were classi®ed
according to the rulebase under consideration and predictions of eect concentrations or ranges of possible eect
concentrations were generated. These predictions were compared to the actual toxicity data retrieved from the database.
The results of this comparison show that generally, the classi®cation system provides adequate predictions of either the
aquatic toxicity (class 1) or the possible range of toxicity (other classes) of organic compounds. A slight underestimation
of eect concentrations occurs for some highly water soluble, reactive chemicals with low log Kow values. On the other
end of the scale, some compounds that are classi®ed as belonging to a relatively toxic class appear to belong to the socalled
baseline toxicity compounds. For some of these, additional classi®cation rules are proposed. Furthermore, some
groups of compounds cannot be classi®ed, although they should be amenable to predictions. For these compounds
additional research as to class membership and associated prediction rules is proposed. Ó 2000 Elsevier Science Ltd.
All rights reserved.
In order to validate a classfication system for the prediction of the toxic eect concentrations of organic environmental
pollutants to ®sh, all available ®sh acute toxicity data were retrieved from the ECETOC database, a database
of quality-evaluated aquatic toxicity measurements created and maintained by the European Centre for the Ecotoxicology
and Toxicology of Chemicals. The individual chemicals for which these data were available were classi®ed
according to the rulebase under consideration and predictions of eect concentrations or ranges of possible eect
concentrations were generated. These predictions were compared to the actual toxicity data retrieved from the database.
The results of this comparison show that generally, the classi®cation system provides adequate predictions of either the
aquatic toxicity (class 1) or the possible range of toxicity (other classes) of organic compounds. A slight underestimation
of eect concentrations occurs for some highly water soluble, reactive chemicals with low log Kow values. On the other
end of the scale, some compounds that are classi®ed as belonging to a relatively toxic class appear to belong to the socalled
baseline toxicity compounds. For some of these, additional classi®cation rules are proposed. Furthermore, some
groups of compounds cannot be classi®ed, although they should be amenable to predictions. For these compounds
additional research as to class membership and associated prediction rules is proposed. Ó 2000 Elsevier Science Ltd.
All rights reserved.
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