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Characteristics: A white crystalline powder, odorless 1. Identification(Infrared Absorption) : Conforms 2.Clarity and color of solution: Clear and colorless 3.Chloride: 0.011% max 4.Sulfate: 0.010% max 5.Ammonium: 0.02% max 6.Heavy metals: 10ppm max 7.Iron: 10ppm max 8.Related substances : 0.2% max 9.Loss on drying: 0.20% (105℃,2 hours)max 10.Residue on ignition: 0.1% max 11.Assay (on the dried basis): 99.0%~101.0% 12.PH: 4.1~5.6