Registration Dossier
Registration Dossier
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EC number: 274-972-1 | CAS number: 70879-65-1
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
Half life period of 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs, in water is observed to be 4320hrs (180 days) while in sediment it is 38400hrs (1600 days), thus indicating that the substance is non biodegradable in both water as well as sediment.
Key value for chemical safety assessment
- Half-life in freshwater:
- 4 320 h
- at the temperature of:
- 25 °C
- Half-life in freshwater sediment:
- 38 400 h
- at the temperature of:
- 25 °C
Additional information
Based on the Level III Fugacity Model, the half life period of the 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs.was estimated.The half period of 2-Naphthalenol, 1-[[4-(phenylazo)phenyl]azo]-, ar',ar''-Me derivs.in water is4320hrs (180days) therfore it is considered that the substance will qualify as persistent as the half life exceed the EPA criteria of 60 days. So, it can be confirmed that the substance is not readily biodegradable in water medium where as in sediment the half life is 38400 hrs (1600 days).
Based on this value, it can be inferred that the substance is persistent in water and sediment medium.
Media |
Half life (days) |
Percent in medium |
Water |
180 |
2%
|
Sediment |
1600 |
28% |
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