Registration Dossier
Registration Dossier
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EC number: 203-919-7 | CAS number: 111-90-0
Endpoint summary
Administrative data
Description of key information
Additional information
The biodegradation of 2 -(2 -ethoxyethoxy)ethanol was assessed at a number of concentrations using a non-adapted domestic sewage innoculum in both freshwater and saltwater media. In both cases rapid degradation was observed (BOD28=87% in freshwater and 70% in seawater. In freshwater, the substance clearly met the criteria to be classified as readily biodegradable. In saltwater, whilst the degradation did not strictly meet the 10 day window for ready biodegradation, this was only missed by a single day and since degradation continued linearly beyond this point, interpretation suggests that this substance can be considered as readily biodegradable in saltwater too.
These results were further supported by the results from inherent biodegradation studies. The biodegradation potential and chemical oxygen demand of 2-(2-ethoxyethoxy)ethanol was assessed using both adapted and unadapted innoculii prepared from a sewage WWTP. Degradation was observed in both cases, with the adapted innoculum providing much more degradation over the 5 day study period. In an inherent biodegradation study according to guideline, 2 -(2 -ethoxyethoxy)ethanol reached a degradation exceeding 90% within 5.5 days. Degradation proceeded at about 30% per day after an initial lag of 3 days before degradation started.
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As the substance is identified as readily biodegradable in the screening studies, further biodegradation testing is not scientifically justified.
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