Abstract:In this study, the S-T model was built by using set pair analysis theory, and the analytic hierarchy process was used to determine the weight of each index by referring to the toxicity equivalency factor. In addition, the triangular fuzzy number was applied to improve the diversity factor. After that, the comprehensive ecological risk classification of aromatic hydrocarbons was assessed by using this proposed S-T model based on Canadian sediment quality standards. The results show that the fuzzy nature of the PAHs ecological risk grade standard in sediments was represented by improving the degree of difference coefficient. This is because the interaction factors between compounds are processed in fuzzy theory in this new method. Moreover, this study could provide a simple, objective, and effective method for the ecological risk classification of persistent organic pollutants.
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