Registration Dossier
Registration Dossier
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EC number: 240-032-4 | CAS number: 15894-70-9
Endpoint summary
Administrative data
Description of key information
Additional information
Penwell and Roberts (1994) conducted a reliable (Klimisch 1) GLP compliant study according to OECD 301 B (CO2 evolution) methods. The biodegradability of HMBDA exposed to microorganisms derived from unacclimated secondary effluent was investigated under aerobic static exposure conditions. Slight biodegradation, based on CO2 evolution, was observed but was considered to be within test variability. The study concluded that no biodegradation was measured in 28 days. Therefore, in is concluded that HMBDA con not be considered readily biodegradable in water.
Waiver. 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) and soil simulation test (required in Sections 9.2.1.3) do not need to be conducted as direct or indirect exposure of sediment is unlikely. Exposure potential is expected to be minimal as the substance is an intermediate product and manufactured and utilized only at one location in the EU and handled under strictly controlled conditions. Also, the substance’s low hydrophilicity is demonstrated by the very low log octanol-water partition coefficient (Log Kow) of 0.465 at a neutral pH. The solubility of HMBDA has also been determined to be very low, making testing difficult. Therefore, no testing is necessary based on unlikely exposure and low solubility. Identification of degradation products (required in Section 9.2.3) is also not necessary.
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