Ammonium Sulfate, Reagent A.C.S.

Assay: ≥99.0% (NH4)2SO4
pH of a 5% solution: 5.0-6.0 at 25 °C
MAXIMUM ALLOWABLE 
Insoluble matter: 0.005%
Residue after ignition: 0.005%
Chloride (Cl)5 ppm Nitrate (NO3): 0.001%
Phosphate (PO4): 5 ppm
Heavy metals (as Pb): 5 ppm
Iron (Fe): 5 ppm
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