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| Impurities content (weight %) | |
|---|---|
| Aluminum (Al3+) | <0.00003 |
| Bismuth (Bi3+) | <0.000005 |
| Iron (Fe2+) | <0.00006 |
| Indium (In3+) | <0.00008 |
| Cadmium (Cd2+) | <0.000005 |
| Magnesium (Mg2+) | <0.00002 |
| Manganese (Mn2+) | <0.000005 |
| Nickel (Ni2+) | <0.00001 |
| Tin (Sn4+) | <0.0001 |
| Lead (Pb2+) | <0.000005 |
| Selenates (SeO42-) | <0.00005 |
| Sulfates (SO42-) | <0.00005 |
| Tellurates (TeO42-) | <0.00005 |
| Phosphates (PO43-) | <0.00005 |
| Chromium (Cr3+) | <0.000005 |
| Zinc (Zn2+) | <0.00001 |



