Registration Dossier
Registration Dossier
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EC number: 249-854-8 | CAS number: 29797-40-8
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
Dichloromethylbenzene is not readily biodegradable but showed biodegradation with a half-life of 31.7 days at 12°C in a surface water simulation test according to OECD 309. However one minor component (2,3 -DCT, content about 9%) showed a half-life of about 55 days. A study in soil with degradation under unaerobic conditions yieled half-lifes in the range of 90 to 120 days. Based on the simulaton test in surface water the substance is P but not vP. Further, neither the T nor the B/vB criteria are fulfilled. Thus, the substance is not a PBT / vPvB substance.
Primary degradation pathways of dichlorotoluenes are hydroxylation of the methyl group and/or di-hydroxylation of the aromatic ring. Both directions yield metabolites which are expected to have a higher water solubility and a lower water-octanol water coefficient. Thus, at least the B-criterion is not fulfilled for these metabolites. Consequently, the metabolites are also not PBT / vPvB.
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