Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
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: 224-226-6 | CAS number: 4253-90-1
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.24 µg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.002 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.024 µg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 4.51 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.94 mg/kg sediment dw
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.094 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:
- PNEC soil
- PNEC value:
- 18.1 µg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- PNEC oral
- PNEC value:
- 6.66 mg/kg food
- Assessment factor:
- 300
Additional information
Conclusion on classification
Acute toxicity studies on fish, invertebrates, and algae are available for polysulfides, di-tert-bu. From the available fish study, no quantitative exposure/effect relationship could be established: there is uncertainty on exposure concentrations from analytical measurements but qualitatively no mortality or sub-lethal effect was observed at a concentration equeivalent to the one producing 50% immobilisation of daphnia (EC50 -48h = 0,24 mg/L). Therefore invertebrates are more sensitive than fish. With respect to algae, the ErC50 -72h = 0.84 mg/L, slightly above the result for invertebrate.
Based on these resultss, in the range 0.1 - 1 mg/L, polysulfides, di-tert-bu is to be classified as very toxic to aquatic organisms as regards acute effects. Moreover, polysulfides, di-tert-bu is not ready biodegradable and its log Pow value is 5.6
Polysulfides, di-tert-bu is not classified in annex I of the former 67/548/EEC directive (DSD) but according to the criteria it can be self-classified as N-R50/53. According to regulation 1272/2008/EC (CLP) criteria, it has to be self-classified as "Aquatic Chronic Category 1." For mixtures containing the substance a multiplying factor M = 1 should be used.
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.
