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| Impurities content (weight %) | |
|---|---|
| Insoluble in HCl substances | <0.1 |
| Chlorides (Cl-) | <0.04 |
| Total nitrogen (N) | <0.02 |
| Iron (Fe2+) | <0.005 |
| Potassium + Sodium + Calcium (K+ + Na+ + Ca2+) | <0.5 |



