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Ecotoxicological information

Sediment toxicity

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Reference
Endpoint:
sediment toxicity: long-term
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

In accordance with Column 2 of REACH Annex IX, the study does not need to be conducted as all identified uses of the substance are assessed as safe for the environment. PNECs for the sediment compartment have been derived from the aquatic toxicity data set using the equilibrium partitioning method.

Key value for chemical safety assessment

Additional information

Biphenyl-4,4'-diol will not be applied directly to water and based on the use patterns of biphenyl-4,4'-diol, exposure of aquatic systems is not expected to occur. Moreover, biphenyl-4,4'-diol has been shown to be rapidly biodegradable under the conditions of OECD 301B (confirmed by OECD 301F), with rapid mineralisation to CO2 occurring in aerobic aquatic systems. Furthermore measurements of the adsorption coefficient (Koc) of biphenyl-4,4'-diol ranged from 79 to 200 L/kg, indicating a low affinity for organic matter in soil and sewage treatment plant sludge. Biphenyl-4,4'-diol is therefore not expected to show a strong tendency to bind to organic matter in sediments. Consequently, toxicity studies with sediment-dwelling organisms are not required.

No risk to sediment biota was indicated in a chemical safety assessment performed according to Annex I, based on PNECs for the sediment compartment that have been derived from the aquatic toxicty data set using the equilibrium partitioning method. As the PNEC sediment is typically greatly underestimated by this method, it is considered that this is sufficient to demonstrate the absence of unacceptable risk to biota of the aquatic sediment compartment.