Registration Dossier
Registration Dossier
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EC number: 269-798-8 | CAS number: 68333-89-1 The non-volatile, high-boiling residue from the distillation of products from cumene-phenol process. It consists predominantly of substituted phenyl groups crosslinked by carbon-oxygen bonds and phenylaliphatic bonds.
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Based on the results of a study conducted according to OECD Guideline 301 D and EU Method C.4-E, Z-Oil must be considered as not readily biodegradable (7% degradation after 28 d). In a study conducted according to OECD Guideline 302 C, Z-Oil was degraded by 52% after 28 d. Therefore Z-Oil can be considered as inherently biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
The ready biodegradation of Z-Oil was investigated in a study conducted according to OECD Guideline 301 D and EU Method C.4 -E using an inoculum obtained from sewage effluent of a municipal sewage treatment plant and a soil mixture. Z-Oil proved to be not readily biodegradable (7% degradation after 28 d). The functional control sodium benzoate reached the pass level >60% after 7 d of incubation. In the toxicity control containing both test and control substance 55% degradation occurred within 14 d thus indicating that the test item was not inhibitory at the concentration tested. The inherent biodegradability of Z-Oil was investigated in a study conducted according to OECD Guideline 302 C over a period of 28 d and using activated sludge as inoculum obtained from two municipal sewage treatment plants. Based on the results of ThOD and BOD measurements, Z-Oil can be considered as inherently biodegradable (52% degradation after 28 d). The functional control sodium benzoate reached the pass level >60% after 6 d of incubation. In the toxicity control containing both test and control substance >80% degradation occurred within 14 d thus indicating that the test item was not inhibitory at the concentration tested.
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