质量标准: GB/T 661-92
项目Item 分析纯 化学纯
(AR) (CP)
含量[Fe(NH4)2(SO4)2·6H2O)Assay,% ≥99.5 99.0
pH(50g/L溶液,25℃) 3-5 3-5
水不溶物Insoluble matter in water,% ≤0.005 0.02
氯化物(Cl)Chloride,% ≤0.001 0.005
磷酸盐(PO4)Phosphate,% ≤0.0005 0.002
锰(Mn)Manganese,% ≤0.05 --
高铁(Fe)Ferric,% ≤0.01 0.02
铜(Cu)Copper,% ≤0.002 0.01
锌(Zn)Zinc,% ≤0.005 0.02
铅(Pb)Lead,% ≤0.002 0.004
氨水不沉淀物(以硫酸盐计)Substances not
precipitated by ammonia,% ≤0.1 0.2
ACS级
项目名称Item ACS Grade
含量[Fe(NH4)2(SO4)2·6H2O]Assay 98.5-101.5%
水不溶物Insoluble matter in water ≤0.01%
磷酸盐(PO4)Phosphate ≤0.003%
钙(Ca)Calcium(Ca) ≤0.005%
铜(Cu)Copper(Cu) ≤0.003%
镁(Mg)Magnesium(Mg) ≤0.002%
钾(K)Potassium(K) ≤0.01%
钠(Na)Sodium(Na) ≤0.02%
锌(Zn)Zinc(Zn) ≤0.003%
高铁(Fe3+)Ferric ion ≤0.01%