Registration Dossier
Registration Dossier
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EC number: 201-280-9 | CAS number: 80-46-6
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
No long-term toxicity to sediment organisms is available for p-tert-amylphenol.
Key value for chemical safety assessment
Additional information
No aquatic test data for p-tert-amylphenol are available for freshwater sediment-dwelling organisms. In the absence of test data a PNECsedimentcan be calculated from the PNECaquatic by the equilibrium partitioning method. Any requirement for further testing will be determined on the basis of the outcome of the risk characterisation carried out in accordance with Annex I.
Testing for toxicity to sediment organisms is not considered necessary because:
PNECsediment has been calculated from PNECfreshwater on the basis of the equilibrium partitioning method; the risk characterisation ratio (RCR) based on PNECsediment is <1.
There are no reliable toxicity data for sediment-dwelling organisms relating to p-tert-amylphenol. A waiver is applied for this endpoint as direct and indirect exposure of sediment is unlikely.
In accordance with REACH Regulation 1907/2006, Annex X, Column 2, studies of the effects on sediment organisms need not be conducted if exposure assessment indicates no concern for exposure to that environmental compartments.
It is proposed that testing is waived since direct and indirect exposure of sediment is unlikely. Reliable biodegradation study results indicate that although the substance is not considered readily biodegradable, the test substance biodegrades rapidly once microbes have had a chance to acclimate. Study results indicate the test substance is inherently biodegradable. Use of the substance does not include direct exposure to sediment. It can be assumed that p-tert-amylphenol will be biodegraded within the STP process and as a consequence a transfer to the soil compartment via sewage sludge is not expected. All sludges related to the use of p-tert-amylphenol will be through industrial WWTP as the substance is used as an intermediate. Any release to wastewater treatment plant or soil from residual p-tert-amylphenol in resin is negligible. Therefore, no tests on sediment organisms are provided.
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