Registration Dossier
Registration Dossier
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EC number: 243-325-5 | CAS number: 19800-42-1
PBT assessment
Administrative data
PBT assessment: overall result
- Name:
- 4-[[2-Methoxy-4-[(4-nitrophenyl)azo]phenyl]azo]phenol
- Type of composition:
- boundary composition of the substance
- State / form:
- solid: particulate/powder
- Reference substance:
- 4-[[2-Methoxy-4-[(4-nitrophenyl)azo]phenyl]azo]phenol
- PBT status:
- the substance is not PBT / vPvB
- Justification:
The test substance is neither P nor T. The measured partition coefficient n-octanol/water of the test substance was determined at 5.2 (20°C), which is above the ECHA guidance cutoff ‘B’ criteria. Considering the low water solubility value of <0.04 mg/L (20°C), there is no exposure expected to any aquatic organisms. Additionally, looking at the influence of lipid solubility on the bioconcentration of hydrophobic compounds which demonstrate a decrease in lipid solubility with increasing Kow values (Chessellset al., 1992) for super hydrophobic compounds, it can be assumed that it will lead to reduced BCFs. The calculated BCF for fish based on the log Kow of 5.2 with regression basis is 1.0 (10 L/kg; BCFBAF v.3.01). The highest calculated log BCF according to the Arnot-Gobas method considering biotransformation is 3.1 (1371 L/kg; lower trophic level; BCFBAF v3.01). In conclusion, the substance is not expected to accumulate significantly in aquatic organisms. The test substance neither fulfils the B nor the vB criterion. In conclusion, the substance is not PBT or vPvB.
Reference
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