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(38-45) Classification of Toxicity Data for the Evaluation of Sediment Quality . Ahlf, Wolfgang*,1, Heise, Susanne1, 1 TUHH, Hamburg, Germany ABSTRACT- A growing consensus exists that multiple endpoints are necessary to assess sediment quality effectively. Given the wide range of effect endpoints and exposure routes, it is hardly surprising that combining toxicity results can be a complicated task. Situations may arise in which both positive and negative responses are measured for the same sediment. A set of five bioassays were tested in different surveys. A principle component analysis showed a destinct redundancy for each case study. Most applications for a ranking of toxicity data are of comparative character. A method that might overcome the restrictions is the classification of sediment data on the basis of response patterns translated into fuzzy rules. An example will show the possibilities of a sediment classification according to this procedure. Key words: sediment, toxicity, classification |
