性状 (characters) |
浅蓝绿色结晶 (pale green crystallization) |
合格 (conform) |
含量 (assay) |
99.0% |
99.5% |
水不溶物 (water-insoluble) |
0.005% |
0.003% |
硫酸盐 (sulphates) |
0.003% |
0.001% |
硝酸盐 (nitrites) |
0.01% |
0.006% |
砷 (arsenic) |
0.0002% |
0.00008% |
铁 (iron) |
0.002% |
0.0008% |
铅 (lead) |
0.002% |
0.0008% |
镍 (nickel) |
0.001% |
0.0006% |
硫化氢不沉淀物 (non-sludging to hydrogen sulfide) |
0.05% |
0.03% |