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In a study conducted according to OECD Guideline 305 E (Bioaccumulation: Flow-through Fish Test) Cyprinus carpio were exposed to m-/p-diisopropylbenzene concentrations of 2 and 20 µg/L for 56 d. For p-diisopropylbenzene BCF values ranging from 530 to 2300 at 20 µg/L and 512 to 2960 at 2 µg/L were determined and for m-diisopropylbenzene BCF values ranging from 503 to 1680 at 20 µg/L and 546 to 3210 at 2 µg/L. These results indicate a moderate potential for bioconcentration and the substance fulfills the B criterion and not the vB criterion.