性状 (characters) |
无色结晶 (colorless crystal) |
合格 (conform) |
含量 (assay) |
98.0% |
99.0% |
澄清度实验 (appearance of solution) |
合格 (conform) |
合格 (conform) |
盐酸不溶物 (hydrochloric acid insoluble) |
0.005% |
0.002% |
硫酸盐 (sulphates) |
0.003% |
0.001% |
铁 (iron) |
0.003% |
0.0015% |
铜 (copper) |
0.002% |
0.0008% |
砷 (arsenic) |
0.0001% |
0.00006% |
铅 (lead) |
0.005% |
0.003% |
碱金属及碱土金属 (alkaline earths and alkaline-earth metals) |
0.02% |
0.01% |