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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 233-333-7 | CAS number: 10124-41-1
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The values of >75.7 and ≥75.7 mg S2O32-/L (72h-EC50 and 72h-EC10 respectively) were put forward for the environmental classification and effects assessment of thiosulfate substances.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 75.7
- EC10 or NOEC for freshwater algae:
- 75.7
Additional information
One reliable study was identified for the evaluation of thiosulfate substances towards aquatic algae. ECT (2010) investigated the effects of ammonium thiosulfate ((NH4)2S2O3) on the growth rate of the green alga Pseudokirchneriella subcapitata. A 72h-study was conducted, and the derived effects levels after a 72h-exposure period were considered for assessment purposes. No significant effects were noted at the highest test concentration of 100 mg test substance /L. The 72h-EC50 and 72h-EC10 values were >100 and ≥100 mg (NH4)2S2O3/L, which corresponds to >75.7 and ≥75.7 mg S2O32-/L, respectively (or >107.9 and ≥107.9 mg SO32-/L, respectively).
The values of >75.7 and ≥75.7 mg S2O32-/L (72h-EC50 and 72h-EC10 respectively) were put forward for the environmental classification and effects assessment of thiosulfate substances.
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.
