性状 (characters) |
无色结晶 (colorless crystal) |
合格 (conform) |
含量 (assay) |
99.0% |
99.5% |
水不溶物 (water-insoluble) |
0.005% |
0.0026% |
溴酸盐 (bromate salt) |
0.005% |
0.003% |
氯化物 (chloride) |
0.002% |
0.001% |
硫酸盐 (sulphates) |
0.005% |
0.002% |
砷 (arsenic) |
0.00005% |
0.00003% |
铁 (iron) |
0.0005% |
0.00025% |
钙和镁 (calcium magnesium) |
0.003% |
0.001% |
重金属 (heavy metal) |
0.001% |
0.0006% |