Registration Dossier
Registration Dossier
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EC number: 203-052-4 | CAS number: 102-77-2
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.004 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.003 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:
- 1 000 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.298 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.03 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 0.057 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
In up-to-date assessment, latest and more reliable data are found and hence used for the estimation of PNEC values. This also led to the change in classification from R51/53 to R50/53.
Conclusion on classification
In Directive 67/548/EEC and the regulation (EC) No 1272/2008, 2-(morpholin-4-ylsulfanyl) -1,3-benzothiazole has been legally classified as "Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment" with the phrase of R 51/53 in Annex I and aquatic chronic 2 (H411), respectively. According to the up-to-date information listed below, a stricter self-classification has been proposed in this dossier as “Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment" with the phrase of R 50/53 and aquatic acute 1 (H400) and aquatic chronic 1 (H410).
- The most sensitive acute toxicity is to fish (Oncorhynchus mykiss): 96 hour-LC50 of 0.31 mg/L (Monsanto, 1981a).
- The most sensitive chronic toxicity of MBT (read-across of one main degradation product) was determined in a long-term study with fish (rainbow trout): NOEC (89d) of 0.041 mg/L (CMA, 1989).
- Measured log Pow of 3.4 (Currenta, 2010c), which is higher than 3.
- MBS is not readily biodegradable (Bayer AG, 1988a).
With the data listed above, MBS should be classified as aquatic acute 1 (H400) and aquatic chronic 1 (410) according to GHS (Regulation EC 1272/2008) and as R50/53 according the Directive 67/548/EEC. The appropriate multiplying factors for acute and chronic toxicity are both 1.
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