Registration Dossier
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EC number: 471-920-1 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The test material is considered to be readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
Two studies were available for this endpoint (Clarke 2006, and Kawashima 2006). Considering that Clarke (2006) followed OECD guideline, under GLP, and quality of details, this study is considered as Key study for this endpoint.
The key study (Clarke, 2006) was conducted following OECD guidelines 301B, and EU Method C.4 -C, under GLP conditions. The test material, at a concentration of 10 mg carbon/L, was exposed to activated sewage sludge micro-organisms with culture medium in sealed culture vessels in the dark at 21°C for 28 days.
The test material attained 67% degradation after 28 days. As the test material is a UVCB the 10 -day window validation criterion are not applicable. Therefore, the test material can be considered to be readily biodegradable.
The experiment conducted by Kawashima (2006) followed Biodegradability test of chemical substances by microorganisms (Yakushokuhatsu no. 1121002, Heisei 15.11.13 Seikyoku no. 2, Kanpokihatsu no. 031121002, November 21, 2003; the latest version, 2005). Measurements of Biochemical oxygen demand, Dissolved organic carbon, and residual test substance amount were estimated. From the degradability results based on the BOD (ca. 36%) and the residual test substance amount (ca. 60%), it is conducted that the test substance is not readily biodegradable under the conditions of this test. The test substance was considered to be in process of biodegradation since the BOD value was still increasing.
A new peak was observed on the chromatograms of the GPC. It was presumed that the component was derived from the pretreatment process or transformation.
Test solutions were analyzed with HPLC and LC/MS. However, the structure could not be determined, because no specific peak was detected.
Considering these two studies, the test material is considered to be readily biodegradable.
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