Item Description Standard Q/FCCW 006-2004
1 Assay(dry basis) ≥98.5%
2 Specific rotationD20 -26.00—-29.00
3 Loss on drying ≤1.0%
4 Residue on lgnition ≤0.3%
5 PH 5~6.5
6 Heavy metals(as Pb) ≤20mg/kg
7 Arsenic(As) ≤2mg/kg