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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The lowest EC50 in daphnia exposed to wash oil (composite sample No. 05) is 2.7 mg/L (EL50 = effective loading). 
No data for acute toxicity in saltwater is available for the oil as a total.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
2.7 mg/L

Additional information

Standard tests for short-term effects on aquatic invertebrates are only reported for the registration substance creosote oil, acenaphthene fraction (wash oil) itself, but not for the marker substance acenaphthene as there are several tests available

The lowest EC50 for freshwater invertebrates is 2.7 mg/L given as EL50 (effective loading) determined in a closed static 48-h Daphnia acute immobilisation test. The corresponding EL10 and NOELR value were 2.2 mg/ L and 1.0 mg/L, respectively (Aniol et al., 2009). The Water-Accommodated Fraction (WAF) corresponding to the EL50 is estimated to have been about 1.5 mg TOC/L.

In a previous open static system, an EL50 of 69 mg/L and corresponding values for LOELR and NOELR of 50 mg/L and 25 mg/L, respectively, were determined (Aniol et al., 2007). The Water-Accommodated Fraction (WAF) of the EL50 is estimated to have amounted to about 9 - 10 mg TOC/L (see Chapter 1.3 and IUCID Section 4.8, Water solubility).

The discrepancy between both systems is supposed to be due to the volatility of constituents that primarily exert the toxic effect. The composition of either WAF has not been elucidated.

No acute aquatic toxicity values are available for marine invertebrates.