Registration Dossier
Registration Dossier
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EC number: 642-362-8 | CAS number: 1190630-03-5
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Waiver. Study scientifically unjustified.
Key value for chemical safety assessment
Additional information
As stated in section 5.2.1, reliable studies (Klimisch score 2) were performed in accordance with OECD Guideline 301B (Ready Biodegradability: CO2 Evolution Test) on the two primary constituents of Ziegler Bottoms, icosan-1-ol and docosan-1-ol. 88.4% and 87.9% of icosan-1-ol and docosan-1-ol respectively degraded after 28 days with an unacclimated sewage sludge innoculum. The test substances also achieve 60% degradation with a 10-day window indicating ready biodegradability. As both constituents are readily biodegradable, Ziegler Bottoms can also be regarded as readily biodegradable. Minor residual constituents which include, ethers, esters and alkanes are also expected to degrade rapidly.
In accordance with Column 2 of REACH Annex VIII, the adsorption/desorption screening test (required in Section 9.3.1) does not need to be conducted as the substance is readily biodegradable.
An estimated Koc value of 112000 L/Kg was obtained for both docosan-1-ol and icosan-1-ol using an appropriateTGD Non-hydrophobics [o1] equationestimation method. The result is considered to be reliable and acceptable for use in environmental exposure modelling. In line with the read-across justification this estimated value can be considered for the relevant Ziegler Bottoms endpoint.
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