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| Impurities content (weight %) | |
|---|---|
| Insoluble in water substances | <0.0025 |
| Bismuth (Bi3+) | <0.0005 |
| Iron (Fe2+) | <0.0001 |
| Cadmium (Cd2+) | <0.00005 |
| Potassium + Sodium + Calcium + Strontium (K+ + Na+ + Ca2+ + Sr2+) | <0.0005 |
| Cobalt (Co2+) | <0.00005 |
| Manganese (Mn2+) | <0.00005 |
| Copper (Cu2+) | <0.0001 |
| Arsenic (As3+) | <0.0005 |
| Nickel (Ni2+) | <0.00005 |
| Tin (Sn2+) | <0.00005 |
| Mercury (Hg2+) | <0.00005 |
| Silver (Ag+) | <0.0001 |
| Antimony (Sb3+) | <0.0005 |
| Thallium (Tl+) | <0.00005 |
| Chlorides (Cl-) | <0.00025 |
| Zinc (Zn2+) | <0.00005 |



