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Ammonium sulphate does not hydrolyze nor is there evidence for photodegradation.In aqueous solution, ammonium sulfate is completely dissociated into the ammonium ion (NH4+) and the sulfate anion (SO4 2-).

Due to the inorganic nature of the substance standard biodegradation testing systems are not applicable.In unsterilized soil, ammonium sulfate is mineralized fairly rapidly, and subsequently nitrified. Nitrification and de-nitrification processes also occur naturally in streams and rivers, as well as in many secondarysewage treatment processes.

Based on the high water solubility and the ionic nature, ammonium sulfate is not expected to adsorb or bioaccumulate to a significant extent. This is underlined by a low log Pow as measured for Ammonium sulphate (log Pow = -5.1, see chapter 4.7).Due to the salt-character of the substance the calculation of a fugacity model is not appropriate. Based on the physico-chemical properties ofammonium sulfate, water is expected to be the main target compartment. Based on the high water solubility a low geoaccumulation potential and high mobility in soil is to be expected. However, due to ion-ioninteractions it is to be expected that mobility in soil is significantlyreduced. Ammonium sulfate will not volatilize from soil.Because of the chemical structure of ammonium sulfate, the Henrys Law Constant is not assignable.

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