Registration Dossier
Registration Dossier
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EC number: 642-362-8 | CAS number: 1190630-03-5
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Waiver. Study scientifically unjustified.
Key value for chemical safety assessment
Additional information
Ziegler Bottoms are characterized as comprising of two primary constituents; icosan-1-ol and docosan-1-ol. Together these constituents represent a structural class of components (alcohols) that constitute approximately 82% of the composition of Ziegler Bottoms. 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 inoculum. 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. It should be noted that these minor residual constituent degradation products of Ziegler Bottoms are unlikely to be chemicals that might be a cause for concern.
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