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.
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
In a study conducted according to OECD Guideline 201 and EU Method C.3, cultures of Desmodesmus subspicatus were exposed to WAFs of Z-Oil for 72 h under static conditions. The actual test concentration was checked by IR-spectroscopy. As the test item proved to be stable in the aqueous phase (>=80% recovery after 72 h), the test results were based on nominal concentrations. The 72 h NOEC, LOEC, and EC50 based on growth rate were determined to be 80, 100, 96.4 mg/L (nominal), respectively. The corresponding values (72 h NOEC, LOEC, and EC50) based on yield were 80, 100, and 88.4 mg/L (nominal).
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 96.4 mg/L
- EC10 or NOEC for freshwater algae:
- 80 mg/L
Additional information
The toxicity of Z-Oil towards the unicellular green alga Desmodesmus subspicatus was investigated in a study conducted according to OECD Guideline 201 and EU Method C.3 Cultures of Desmodesmus subspicatus were exposed to Z-Oil concentrations ranging from 10 to 100 mg test item/L under static conditions for 72 h. As the test item is poorly water-soluble, the aqueous extracts (WAFs) of the test substance were used in the test. The actual test concentration was checked by IR-spectroscopy. The water analysis of the WAFs showed that lower amounts than nominal applied were dissolved in the aqueous phase. As the test item proved to be stable in the aqueous phase (>=80% recovery after 72 h), the test results were based on nominal concentrations. The 72 h NOEC, LOEC, and EC50 based on growth rate were determined to be 80, 100, 96.4 mg/L (nominal), respectively. The corresponding values (72 h NOEC, LOEC, and EC50) based on yield were 80, 100, and 88.4 mg/L (nominal).
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