Registration Dossier
Registration Dossier
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EC number: 204-424-9 | CAS number: 120-78-5
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 3.8 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.22 mg/kg sediment dw
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.022 mg/kg sediment dw
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no hazard identified
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
MBTS is classified according to the regulation (EC) No 1272/2008 as "very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment" in the hazard category aquatic acute 1 (hazard statement: H400) and aquatic chronic 1 (hazard statement: H410), respectively. This classification however is considered as over conservative according to up-to-date assessment as following:
- Some old studies, supporting the classification of MBTS as aquatic acute 1 (H400) and aquatic chronic 1 (H410) according to GHS (Regulation EC 1272/2008), are judged as invalid according to current regulatory requirement. For example, Monsanto (1979) reported an EC50 to algae of 0.7 mg/l based on cell number but not growth rate, and no exponential growth can be concluded for control experiment; and hence information in this study is insufficient for assessment.
- No acute or chronic toxicity of MBTS to three taxonomic groups of three trophic levels was observed up to its water solubility (i.e. 0.05 mg/L) in the reliable studies.
- MBTS is not readily biodegradable with 0% degradation observed in 28 days (Bayer AG, 1988).
However, the original classification is maintained as self-classification; and hence MBTS shall be classified as aquatic acute 1 (H400) and aquatic chronic 1 (H410) according to GHS (Regulation EC 1272/2008). The appropriate multiplying factors are 1 for acute and chronic toxicity.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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