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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 215-185-5 | CAS number: 1310-73-2
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Waste water from NaOH production sites is coming from the salt electrolyses and is an inorganic wastewater stream. For this reason it is not feasible to treat it biologically. Therefore, wastewater streams from NaOH production sites will normally not be treated in biological waste water treatment plants (WWTPs). Direct discharging of NaOH solutions into municipal wastewater must be avoided unless neutralization is carried out. NaOH may be used beneficially, however, for pH control of acid wastewater streams that are treated in biological WWTP’s (EU RAR, 2007). Consequently, the pH of the influent of a municipal wastewater treatment plant is neutral and therefore, there is no exposure of micro-organisms.
Key value for chemical safety assessment
Additional information
No valid studies are available for the endpoint toxicity to microorganisms. Despite of this, there is no need for additional aquatic toxicity testing with NaOH, as all available tests resulted in a rather small range of toxicity values and there are sufficient data on the pH ranges that are tolerated by major taxonomic groups (EU RAR of NaOH, 2007; section 3.2.1.1.4, page 30).
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.
