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分子式：C2H2O4.2H2O
分子量：126.07
外觀：無色結晶。在溫熱、干燥空氣中風化。溶于水、乙醇。
| 含量(C2H2O4.2H2O)不少于 | 99.5% |
| 雜質最高含量(指標以%計) | |
| 澄清度試驗 | 合格 |
| 水不溶物 | 0.005 |
| 灼燒殘渣(以硫酸鹽計) | 0.02 |
| 氯化物(Cl) | 0.002 |
| 總氮量(以N計) | 0.002 |
| 硫酸鹽(SO4) | 0.002 |
| 鈣(Ca) | 0.003 |
| 鐵(Fe) | 0.0005 |
| 重金屬(以Pb計) | 0.0004 |
| 易碳化物質 | 合格 |
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