Registration Dossier
Registration Dossier
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EC number: 231-984-1 | CAS number: 7783-20-2
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
Hydrolysis of ammonium sulfate does not occur. In aqueous solution, ammonium sulfate is completely dissociated into the ammonium ion (NH4+) and the sulfate anion (SO42-). 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 pH increases, the fraction of the total ammonia which is un-ionized 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-ionized 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 GJ, Arnold CR (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.
OECD (2007). SIDS Initial Assessment Report. Ammonium Sulfate, CAS Number: 7783-20-2.
Riceand Bailey JE (1980). Survival, size, and emergence|of pink salmon, Oncorhynchus gorbuscha, alevins after short- and long-term exposures to ammonia. Fishery Bulletin. 78: 641-648.
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