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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

During the 21-day study, the adult daphnids exposed to the test substance at a loading rate of 1 mg/L produced significantly fewer (<0.05) live offspring per adult than the adult daphnids in the control media. Therefore, the 21-day NOELR for reproduction was <1 mg/L. There was also a greater number of dead offspring produced by the daphnids exposed to the test substance compared with those in the control. There was 10% immobility of parents in the treatment solution, which was equivalent to the control mortality, therefore the EL50 can be reported as >1 mg/L.

Key value for chemical safety assessment

Additional information

Hydrocarbon solvents are UVCBs formed by homologous series of different classes of hydrocarbons. As these test substances are complex petroleum substances comprising large numbers of poorly water soluble hydrocarbons, it has been recommended that only ecotoxicity data generated using a “water accommodated fraction” (WAF) approach will be suitable for the purposes of classifying and labelling for environmental hazard. In the WAF methodology, test substances are typically equilibrated with water at each "concentration" or loading rate in sealed test vessels and the water phase ("WAF") tested for toxicity. Test data generated using other approaches, like gas phase loading or Water Soluble Fraction (WSF) testing, are not considered appropriate due to methodological issues which will impact hydrocarbon exposure concentrations.

 

During the 21-day study, the adult daphnids exposed to the test substance at a loading rate of 1 mg/L produced significantly fewer (<0.05) live offspring per adult than the adult daphnids in the control media. Therefore, the 21-day NOELR for reproduction was <1 mg/L. There was also a greater number of dead offspring produced by the daphnids exposed to the test substance compared with those in the control. There was 10% immobility of parents in the treatment solution, which was equivalent to the control mortality, therefore the EL50 can be reported as >1 mg/L.