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Appearance     Colorless crystals, slight acetic acid odor
Assay (dry basis, %)     99.0-101.0
pH (5% Solution, 25℃)     7.5- 9.0
Loss on Drying (120℃, 4h, %)     36.0 – 41.0
Insoluble Matter (%)     =< 0.05
Chlorides (Cl, %)     =< 0.035
Alkalinity (as Na2CO3, %)     =< 0.05
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 (Hg)     =< 1 mg/kg
Heavy Metal (as Pb)     =< 10 mg/kg