Registration Dossier
Registration Dossier
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EC number: 202-409-1 | CAS number: 95-31-8
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.002 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.001 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 100 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.08 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.008 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.796 mg/kg soil dw
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
N-tert-butylbenzothiazole-2-sulphenamide has been self-classified before. However, based on up-to-date ecotoxicological studies, new classification for aquatic environment is recommended.
Conclusion on classification
The classification of TBBS is not yet contained in Annex I of Directive 67/548/EEC nor in the regulation (EC) No 1272/2008, but a self classification as R50/53 and aquatic acute 1 (H400) and aquatic chronic 1 (H410) is available.
The up-to-date information confirmed this classification and is summarised below:
- The most sensitive acute and chronic toxicity is to aquatic algae (Scenedesmus capricornutum): 72h- ECr50 of 0.071 mg/L and NOEC of 0.023 mg/L( Ministry of the Environment, Japan, 1996).
- Measured log Pow of 3.36 (DUSLO, 2007), which is higher than 3.
- TBBS is not readily biodegradable (Bayer AG, 1991).
With the data listed above, TBBS should be classified as R50/53 and aquatic acute 1 (H400) and aquatic chronic 1 (H410). The appropriate multiplying factors for acute and chronic toxicity are10 and 1 respectively.
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