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Diss Factsheets

Ecotoxicological information

Sediment toxicity

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Description of key information

As data for AOH itself are not available, information on the marker substance phenanthrene is used to identify sediment toxicity of AOH. Toxicity values have been located for estuarine sediment in three different species in freshwater and for one species in marine water.

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater sediment:
50 mg/kg sediment dw
EC10, LC10 or NOEC for marine water sediment:
100 mg/kg sediment dw

Additional information

Toxicity tests on sediment organisms with the substancedistillates (coal tar), heavy oils (anthracene oil high (> 50 ppm) BaP, AOH)itself could not be identified. But data obtained with the marker phenanthrene as test substance are available. These will be used to characterise the sediment toxicity of AOH.

There are chronic data for freshwater sediment with annelids, crustaceans and insect larvae, i.e. for three different types of benthic species. The NOEC values (normalised to standard condition of 10 % organic carbon) ranged from 50 to about 200 mg/kg sediment dw. The lowest NOEC of 50 mg/kg sediment dw (standardised) were both obtained from chronic studies with Hyalella azteca and Chironomus riparius (Verrhiest et al. 2001).

In addition, one study was located with the marine infaunal amphipod Rhepoxynius abronius (Swartz et al. 1997). The 10 d LC10 was ca. 100 mg/kg sediment dw. This value was recalculated with respect to standard conditions of 10% organic carbon from original data reported in the study.

For sediment, there is - like in the aquatic compartment - some evidence that phenanthrene toxicity to marine organisms is not higher than to freshwater organisms.