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ITEM	STANDARD
Appearance	White, odorless, hygroscopic powder
Assay (Dry Basis, %)	99.0-101.0
pH (1% Solution, 25℃)	8.0- 9.5
Loss on Drying (120℃, 4 Hours, %)	=< 1.0
Insoluble Matter (%)	=< 0.05
Alkalinity (as NaOH, %)	=< 0.2
Chlorides (Cl, %)	=< 0.035
Formic acid, formates and other oxidizable (as formic acid)	=< 1,000 mg/kg
Phosphate (PO4)	=< 10 mg/ kg
Sulphate (SO4)	=< 50 mg/ kg
Iron (Fe)	=< 10 mg/ kg
Arsenic (As)	=< 3 mg/ kg
Lead (Pb)	=< 5 mg/ kg
Mercury	=< 1 mg/ kg
Heavy Metal (as Pb)	=< 10 mg/ kg
Potassium Salt (%)	=< 0.025