Registration Dossier
Registration Dossier
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EC number: 500-047-1 | CAS number: 26316-40-5 1 - 4.8 moles ethoxylated and 1 - 8.5 moles propoxylated
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
The testing could be waived in accordance with REACH Annex XI. However, ECHA has requested to demonstrate the removal efficiency in STP. Then a simulation test using activated sludge from waste water treatment plant was conducted and showed that biodegradation rate of EO PO EDA polyol was between 70 and 80 percent with a 95% confidence interval between 25 and 100 percent. As a worst-case 25% degradation was incorporated into the manufacturing scenario. Key value for chemical safety assessment
Additional information
In accordance with REACH Annex XI, degradation simulation testing in water and/or sediment does not need to be conducted as from the chemical safety assessment it can be concluded that there is acceptable risk characterization ratio (RCR) for the aquatic compartment. Based on predicted degradation products and associated toxicity and bioaccumulation potentials, further testing is not necessary to inform ecological risk assessment or PBT assessment for this substance and associated degradation products.
However, ECHA has requested to demonstrate the removal efficiency in STP. Then a simulation test using activated sludge from waste water treatment plant was conducted: A biological oxidation model was set up at Texas Operations to demonstrate the ability of activated sludge from Terneuzen's WWTP to biologically degrade EO PO EDA Polyol. The project ran a control train and two spiked trains over a 60 day period and monitored TOC degradation as well as specific polyol degradation. The testing demonstrated average NPOC removal between 68 and 73 percent with a 95% confidence interval (CI) between 39 and 100 percent. Additionally, EO PO EDA Polyol biodegradation rate was between 70 and 80 percent for trains 2 and 3 with a 95% CI between 25 and 100 percent. The WWTP consistently demonstrates superior biological oxidation performance to that of the model in respect to NPOC removal. It can be implied that polyol removal will also be superior.
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