备注：Appearance White Crystalline Main content 99.7% min MgSO4 48.68% min MgO 16.3% min Mg 9.82% min PH(5W/V%Sol) 6-8 Ferron(Fe) 0.0008% max Heavy metal (Pb) 0.0004%max Arsenic(As) 0.0001% max Insoluble 0.001%max Size (mm) 0.2-3
