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EC number: 219-348-1 | CAS number: 2421-28-5
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
After a test period of 28 days, the test item, BTDA, is classified as not readily biodegradable within the 10-d-window and after 28 days.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
The ready biodegradability of the test item 3,3’,4,4’-Benzophenone tetracarboxylic dianhydride (BTDA) was determined with non-adapted activated sludge in the Manometric Respirometry Test for a period of 28 days. The study was conducted from 2012 -05 -11 to 2012 -06 -08 according to OECD guideline 301 F at the Dr. U. Noack-Laboratorien, D-31157 Sarstedt. The test item concentration selected as appropriate was 40.0 mg/L, corresponding to a ThOD of 58.4 mg O2/L per test vessel. The oxygen was depleted by the respiration of bacteria and the degradation was followed by measuring the oxygen concentration. The biodegradation rate is therefore expressed as the percentage BOD (biological oxygen demand) and was calculated for each study day.
The mean oxygen depletion in the inoculum control was 11.3 mg O2/L on day 28.
In order to check the activity of the test system sodium benzoate was used as functional control. The pass level > 60 % was reached after 3 days. The biodegradation rate reached a maximum of 98 % degradation on day 25.
In the toxicity control containing both test and reference item 53 % degradation occurred within 14 days. After 28 days the biodegradation came to 51 %. The degradation of the reference item was not inhibited by the test item (i.e., less than 25% degradation (based on BOD) within 14 d is considered inhibitory).
Both test item replicates did not reach the 10 % level (beginning of biodegradation). No biodegradation was determined until test end. The validity criteria of the guideline are fulfilled.
After a test period of 28 days, the test item, BTDA, is classified as not readily biodegradable within the 10-d-window and after 28 days.
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