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分子式：CaCO3
分子量：100.09
性狀：白色粉末。溶于稀酸，不溶于水。
| 含量不少于 | 99.0% |
| 澄清度試驗 | 合格 |
| 雜質最高含量(指標以%計) | |
| 鹽酸不溶物 | 0.01 |
| 堿度(以OH-計)(mmol/100g) | 0.25 |
| 氯化物(Cl) | 0.002 |
| 硫酸鹽(SO4) | 0.01 |
| 鈉(Na) | 0.1 |
| 鎂(Mg) | 0.05 |
| 鉀(K) | 0.005 |
| 鍶(Sr) | 0.05 |
| 鋇(Ba) | 0.02 |
| 鐵(Fe) | 0.001 |
| 重金屬(以Pb計) | 0.001 |
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