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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 914-103-1 | CAS number: -
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
According to structural properties, hydrolysis is not expected/probable.
Key value for chemical safety assessment
Additional information
According to structural properties, hydrolysis is neither expected nor probable in either ammonium sulphate, potassium sulfate or sodium sulphate. All three substances are very soluble and completely dissociate in aqueous solutions into their constituent ion and the sulphate anion. Depending on pH, ammonia (NH3) exists in equilibrium with the ammonium ion (NH4+), according to the following relationship:
NH4++ H2O <-> NH3+ H3O+
In general, as the pH increases, the fraction of the total ammonia which is un-ionised also increases. For example, at 5 °C and pH 6.5, 0.0395% of the total ammonia is present as NH3. Increasing the pH from 6.5 to 8.5 will increase the un-ionised ammonium by a factor of approximately 100 (Rice and Bailey 1980). Increasing the temperature will also increase the percentage of unionized ammonium. For example, in seawater at 25 °C and pH of approximately 8.1, approximately 7% of the total ammonia is present as NH3.
References:
Holt, G. J., and Arnold, C. R. (1983). Effects of Ammonia and Nitrite on Growth and Survival of Red Drum Eggs and Larvae. Transactions of the American Fisheries society 112: 314-318.
Rice and Bailey, J. E. (1980). Survival, size, and emergence of pink salmon, Oncorhynchus gorbuscha, alevins after short- and long-term exposures to ammonia. Fishery Bulletin. 78: 641-648.
OECD (2005). SIDS Initial Assessment Report. Sodium sulfate, CAS No 7757-82-6. UNEP publications.
OECD (2007a). SIDS Initial Assessment Report. Ammonium sulfate, CAS No 7783-20-2. UNEP publications.
OECD (2007b). SIDS Initial Assessment Report. Potassium Sulfate, CAS No 7778-80-5. UNEP publications.
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.
