Registration Dossier
Registration Dossier
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
