Registration Dossier
Registration Dossier
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EC number: 263-171-2 | CAS number: 61791-39-7
Endpoint summary
Administrative data
Description of key information
Additional information
- The test duration may be extended up to 60 days dependent on the level of biodegradation observed.
- Testing in larger vessels: The test volume employed was increased from 3 litres to 4 litres.
- Increasing the biomass: The concentration of inoculum used was increased from 30 mg suspended solids (ss)/l to 50 mg ss/l.
Two biodegradation studies were carried out on the test material:
Clarke (2012) - Enhanced Biodegradation Screening Test
A study was performed to assess the biodegradability of the test item in an aerobic aqueous medium. The test method was designed to follow OECD Guidelines for Testing of Chemicals (1992) No 301B, "Ready Biodegradability; CO2Evolution Test" referenced as Method C.4-C of Commission Regulation (EC) No. 440/2008 and US EPA Fate, Transport, and Transformation Test Guidelines OPPTS 835.3110 (Paragraph (m)). However following the recommendations of the ECHA REACH Guidance Document “Guidance on information requirements and chemical safety assessment: Chapter R.7b: Endpoint specific guidance” the following modifications to a standard OECD 301B test were made:
The test item attained 31% degradation after 28 days and 77% degradation after 60 days.
Brendgen (1997) - Biodegradation Test Results for the Test Substance PR-471.
Biodegradation testing has been performed on the test substance PR-471 based on OECD guideline 306 for testing chemicals: " Biodegradability in seawater" - Closed Bottle Test. The test substance PR-471 was degraded by 28% after 28 days based on COD calculations and measurements to account for O2 consumption by nitrification.
The latter study (Clarke 2012) is considered to be the key study as this has been carried out according to the most recent Guidelines.
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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