检验项目标准要求(%)分析纯化学纯含量≥99.098.0水不溶物≤0.010.05游离酸(以HCl计)≤0.10.1硫酸盐(SO4)≤0.010.03硝酸盐(NO3)≤0.010.03磷酸盐(PO4)≤0.010.03锰(Mn)≤0.02—亚铁(Fe2+)≤0.0020.005铜(Cu)≤0.0050.01锌(Zn)≤0.0030.01砷(As)≤0.0020.01不沉淀物(以SO4計)≤0.10.5包装:20kg/桶、40kg/桶