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EC number: 237-457-2 | CAS number: 13811-50-2
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The test substance was examined for ready biodegradability according to the national German Standard DIN 38409, Part 43 equivalent to OECD 301 A and OECD 302 B (Inherent biodegradability: Zahn-Wellens test). The test substance was shown to be ready biodegraded by an average of < 10 % and inherently biodegraded by an average of 80 - 90 % over the test period of 28 days. Thus, the test substance was found to be not ready biodegradable but inherently biodegradable according to OECD criteria under the test conditions.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
The test substance was examined for ready biodegradability according to the German Standard DIN 38409, Part 43 equivalent to OECD 301 A (BASF SE, 88/0160). The biodegradation of the test substance was investigated by exposure to the effluent from the waste water treatment plant of BASF (Germany) over 5 days. The test substance was tested in a concentration of 590 mg/L (TOC) and degraded by an average lower than 10 % (BOD5*100/COD). Under the test conditions the test item was found to be not ready biodegradable.
In a secondary study (BASF SE, 88/0160) the biodegradation of the test substance was examined according to OECD 302 B (Zahn-Wellens Test). The biodegradation of the test substance was followed by exposure to the effluent from the waste water treatment plant of BASF (Germany) in a concentration of 1 g/L over 28 days. The test substance was tested in a concentration of 421 mg/L (DOC). The test substance degraded by an average of 80 - 90 %. Under the test conditions the test item was found to be inherently biodegradable.
Supplementary the ready biodegradability of the test substance was determined according to a method equivalent to the 301 A (BASF SE, 01.160/88). Based on the results of this test, the test substance was biodegraded by an average of 12 %.
In addition the inherent biodegradability of the test item was also determined in a supporting study according OECD 302 B (Zahn-Wellens test). In this study (BASF SE, 01.160/88) the test item was biodegraded by an average of 70 % over the test period of 28 days.
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