There, it functions to bind iron and calcium cations that are present in both well water and plant cells.

Being extremely soluble in water, ammonium sulfate can "salt out" (precipitate) proteins from aqueous solutions.

[5] Ammonium sulfate precipitation provides a convenient and simple means to fractionate complex protein mixtures.

Ammonium sulfate is listed as an ingredient for many United States vaccines per the Centers for Disease Control.

[13] Ammonium sulfate is made by treating ammonia with sulfuric acid: A mixture of ammonia gas and water vapor is introduced into a reactor that contains a saturated solution of ammonium sulfate and about 2% to 4% of free sulfuric acid at 60 °C.

Dry, powdered ammonium sulfate may be formed by spraying sulfuric acid into a reaction chamber filled with ammonia gas.

The heat of reaction evaporates all water present in the system, forming a powdery salt.

Ammonium sulfate occurs naturally as the rare mineral mascagnite in volcanic fumaroles and due to coal fires on some dumps.

Heating at higher temperatures results in decomposition into ammonia, nitrogen, sulfur dioxide, and water.

Airborne particles of evaporated ammonium sulfate comprise approximately 30% of fine particulate pollution worldwide.