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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
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EC number: 231-195-2 | CAS number: 7446-09-5
Endpoint summary
Administrative data
Description of key information
Additional information
According to REACH Annex VII and VII , acute studies do not need to be conducted "if there are mitigating factors indicating that aquatic toxicity in unlikely to occur, for instance if the substance is highly insoluble in water or the substance is unlikely to cross biological membranes". No such waiving guidance is available for the evaluation of chronic data. Sulphur dioxide, however, is a gaseous substance and does not remain present in the aquatic environment under this form: Sulfur dioxide will react with water (or water vapour) to form sulfurous acid (H2SO3). According to Eigen (1961), the reaction time for hydratation and reaching equilibrium is less than 1 second.
Consequently, an E(L)C50, EC10 or NOEC expressed as mg SO2/L cannot be determined (i.e., no acute or chronic reference values can be generated). Secondly, as SO2 is not present in the aquatic compartment for a relevant time period, this substance will not cross biological membranes, or will not interact with it in another way.
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.
