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Sediment toxicity

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Description of key information

Based on the outcome of the CSA there is no further need to conduct studies on the long-term toxicity to sediment organisms.

Key value for chemical safety assessment

Additional information

According to REACh legislation, Annex X, 9.5.1, column 2, studies on long-term toxicity to sediment organisms do not need to be conducted if the results of the chemical safety assessment indicate no further need. For the purpose of risk assessment, PNECs for hydrocarbon blocks incorporated into the PETRORISK model have been derived using aquatic PNECs and the equilibrium partitioning method (EqP). The outcome of the risk assessment with RCRs far below 1, i.e. regional RCR of 1.4E-06 (freshwater sediment) and local RCR of 3.8E-02 to 7.9E-06 (freshwater sediment) and 3.8E-03 to 4.0E-09 (marine sediment), do not indicate a risk to sediment (see localCSR and regionalCSR in PETRORISK spreadsheet attached in IUCLID section 13). Further, screening tests on biodegradation in water demonstrate that isoheptane is inherently biodegradable and shows the potential to degrade and disappear from the environment. Thus, isoheptane is not expected to persist in the environment under aerobic conditions.