含量
Assay

≥98%

铜(Cu)
Copper

≤0.005%

铁(Fe)
Ferric

≤0.002%

锌(Zn)
Zinc

≤0.005%

铅(Pb)
Lead

≤0.002%

钠(Na)
Sodium

≤0.002%

硫酸根SO₄
Sulfate

≤0.01%

水不溶物
Water insolubles

≤0.02%