Registration Dossier
Registration Dossier
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EC number: 903-161-3 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
EC 903-161-3 is a substance of unknown, variable composition or biological origin (UVCB).
The substance is poorly soluble in water and therefore abiotic hydrolysis is not a relevant pathway.
In the key persistence study (2016 OECD 301B), EC 903-161-3 was shown to undergo biotic and abiotic degredation, but did not fulfil the criteria for ready biodegredability. Due to the test items low water solubility, silica gel was used to enhance the availability to the inoculum, the study was also extended to 60 days to investigate the inherent degradation potential of the test item. A mean total of 49.5% degradation was achieved. The average biotic and abiotic cumulative percent biodegradation for EC 903-161-3 were 6.4% and 43.1% respectively. EC 903-161-3 may not be considered readily biodegradable, since 60% TCO2 was not achieved within 10 days of achieving 10% TCO2. Based on these findings it was concluded that the test item was not readily biodegradable.
The substance has a log Koc > 3 indicating a potential to adsorb to soil and sediment particles. Due to its low water solubility (< 0.5 mg/L in water) and potential for adsorption to soil and sediment particles, only low concentrations of the substance are expected to be released into the aquatic environment. The substance will be bioavailable to aquatic organisms mainly via feed and contact with suspended organic particles. EC 903-161-3 is not bioaccumulative, based on the criteria given in Regulation (EC) No. 1907/2006, Annex XIII, 1.1.2 (BCF < 2000 L/kg). This assessment is based on BCF/BAF values estimated with the BCFBAF v3.01 program, calculated for representative structures of this UVCB, as well as the high log Kow ( > 10; KOWWIN v1.68).
In conclusion, based on the current data, EC 903-161-3 is not rapidly removed by biotic degradation processes. Due the low water solubility and high adsorption potential, the main route of exposure for aquatic organisms such as fish will be via food ingestion or contact with suspended solids.In addition, available data indicate that this substance is not bioaccumulative.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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