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分子式：C10H14N2Na2O8.2H2O
分子量：372.24
性狀：白色結晶性粉末，溶于水，溶液呈酸性。幾乎不溶于醇.
| 含量不小于 | 99.0%. |
| 雜質最高含量(指標以%計) | |
| PH值(50g/L，20°C) | 4.0-5.0 |
| 氨基三乙酸 | 0.05 |
| 澄清度實驗 | 合格 |
| 氯化物 | 0.005 |
| 硫酸鹽(SO4) | 0.02 |
| 鐵(Fe) | 0.001 |
| 重金屬(以Pb計) | 0.001 |
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