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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Simulation test: ISO 11733: 1995 - 98% mineralisation (last 30 days of test)

Key value for chemical safety assessment

Additional information

In accordance with Column 2 of REACH Annex IX, the simulation test on ultimate degradation in surface water and the sediment simulation test (required in Sections 9.2.1.2 and 9.2.1.4 respectively) do not need to be conducted as the substance is readily biodegradable. Identification of degradation products (required in Section 9.2.3) is also not necessary.

Radiolabelled pentadecanol (branched with an average of 1.4 branches) was studied in a model continuous activated sludge (CAS) plant. The CAS plant was fed daily with fresh domestic sewage, and the input concentration of pentadecanol was 1 mg/l, dispersed with a surfactant. The study duration was 53 days, allowing for a stabilisation period followed by a measurement period. Over the last 30 days of the study the substance was 98% mineralised, with 0.05% pentadecanol remaining in the effluent, and 0.4% of the radioactivity adsorbed to the sludge. The overall removal from influent was >99.9%, and removal from the total system was 99.5%. Of the remaining (non-mineralised) radioactivity there was evidence of more polar metabolites being formed as well as lipids derived from the alcohol.

The study is Klimisch 1. GLP applies to a study conducted in accordance with an ISO method (ISO 11733:1995) comparable to the OECD 303 method (EU C.10).