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There is no evidence for photodegradation of ammonium sulfate. However, ammonium sulfate may be formed in atmospheric aerosols (occurrence predominantly in the fraction < 2.5 μm) from reaction between ammonia and sulfuric acid (from SO2 emissions). SO2 concentrations control the ammonium sulfate formation (Scott and Cattell, 1979; Gmur, Evans and Cunningham, 1983).


In aqueous solution, ammonium sulfate is completely dissociated into the ammonium ion (NH4+) and the sulfate anion (SO4 2-). Hydrolysis of ammonium sulfate does not occur.


OECD (2007). SIDS, Ammonium sulphate, CAS: 7783 -20 -2

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