性状 (characters) |
白色结晶性粉末 (white crystalline powder) |
合格 (conform) |
含量 (assay) |
99.5% |
99.8% |
澄清度实验 (appearance of solution) |
应符合规定 (comply with the standard) |
合格 (conform) |
水不溶物 (water-insoluble) |
0.005% |
0.002% |
灼烧残渣 (ignition residue) |
0.02% |
0.006% |
硫酸盐 (sulphates) |
0.005% |
0.003% |
磷酸盐 (phosphate) |
0.0005% |
0.00025% |
钠 (sodium ) |
0.005% |
0.003% |
镁 (magnesium) |
0.001% |
0.0005% |
钾 (potassium) |
0.005% |
0.003% |
钙 (calcium) |
0.001% |
0.0008% |
铁 (iron) |
0.0005% |
0.0003% |