Registration Dossier
Registration Dossier
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EC number: 215-185-5 | CAS number: 1310-73-2
Endpoint summary
Administrative data
Description of key information
Additional information
According to the REACH Regulation, an adsorption/desorption study does not need to be conducted if based on the physicochemical properties the substance can be expected to have a low potential for adsorption (Annex VIII, column 2 adaptation).
Considering its high water solubility, NaOH is not expected
to bioconcentrate in organisms. High water solubility and low vapor
pressure indicate that
NaOH will be found predominately in the aquatic environment.
The 73% aqueous solution of NaOH at ambient temperatures is
a highly viscous, gelatinous material and without
additional dilution (precipitation), it is not expected to
infiltrate soil to any significant extent. The 50% aqueous
solution of NaOH is liquid and is expected to infiltrate
soil to a measurable degree. As the dilution of NaOH
increases, its speed of movement through soil increases.
During movement through soil, some ion exchange will occur.
Also, some of the hydroxide may remain in the aqueous phase
and will move downward through soil in the direction of
groundwater flow (EU RAR 2007, section 3.1.3, page 24).
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.
