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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 235-227-6 | CAS number: 12136-45-7
Endpoint summary
Administrative data
Description of key information
Additional information
Stability
Phototransformation in air
Dipotassium oxide/ Potassium oxide has low vapor pressure (3.03E-014 Pa) indicating significant amounts of Dipotassium oxide/ Potassium oxide are unlikely to be present in the atmosphere for photodegradation.
If released to air, a vapor pressure of 2.27E-016 mm Hg at 25 deg C (2.27E-016 mm Hg is equivalent to a vapour pressure of 3.03E-014 Pa) indicates significant amounts of Dipotassium oxide/ Potassium oxide are unlikely to be present in the atmosphere for photodegradation and therefore Dipotassium oxide/ Potassium oxide is not expected to be susceptible to direct photolysis by sunlight.
Phototransformation in water
If released into water, Dipotassium oxide/ Potassium oxide is not expected to adsorb to suspended solids and sediment based upon the estimated Koc value of 13.22 L/kg. Volatilization from water surfaces is not expected to be an important fate process based upon this compound's estimated Henry's Law constant is 2.814E-023 atm-m3/mole (2.851E-018 Pa-m3/mole).
On this basis phototransformation in water is not expected .
Therefore testing for Phototransformation in water does not need to be performed.
Phototransformation in soil
If released to soil, Dipotassium oxide/Potassium oxide is expected to have very high mobility based upon an estimated Koc of 13.22. Volatilization from moist soil surfaces is not expected to be an important fate process.
Therefore testing for Phototransformation in soils does not need to be performed.
Hydrolysis
According to “ANNEX VIII- STANDARD INFORMATION REQUIREMENTS FOR SUBSTANCES MANUFACTURED OR IMPORTED IN QUANTITIES OF 10 TONNES OR MORE , study for Hydrolysis as a function of pH does not need to be conducted if:
-the substance is ready biodegradable.
As Dipotassium oxide/Potassium oxide is ready biodegradable a Hydrolysis study does not need to be conducted.
Hydrolysis is not expected to be an important environmental fate process since this compound lacks functional groups that hydrolyze under environmental conditions.
Hydrolysis is a chemical reaction during which molecules of water (H2O) are split into hydrogen cations (H+, conventionally referred to as protons) and hydroxide anions (OH−) in the process of a chemical mechanism).
Potassium oxide is a basic oxide and reacts with water violently to produce the caustic potassium hydroxide
When water is added to Potassium oxide, KOH is produced.
K2O+H2O→KOH
On this basis, Potassium oxide does not have a potential for Hydrolysis and Potassium ion will not hydrolise.
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.
