ITEM | Unit | Quality Standards |
Characters |
---- | White or almost white, crystalline powder or granular crystals. Slightly deliquescent in moist air. Freely soluble in water, practically insoluble in ethanol |
Assay | % | 99.0～100.5 |
Water | % | 11.0～13.0 |
PH（5%w/v） | ---- | 7.5～9.0 |
Sulfate 硫酸盐 : Max | mg/kg | 150 |
Oxalate 草酸盐 : Max | mg/kg | 100 |
Chloride 氯化物 : Max | mg/kg | 50 |
Lead 铅 : Max | mg/kg | 1 |
Arsenic 砷 : Max | mg/kg | 1 |
Mercury 汞 : Max | mg/kg | 1 |
Heavy Metals (as Pb) 重金属（以 Pb 计） : Max | mg/kg | 10 |
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