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| Impurities content (weight %) | |
|---|---|
| Calcium (Ca2+) | <0.003 |
| Magnesium (Mg2+) | <0.003 |
| Aluminum (Al3+) | no spectral line Al 3092.7Å |
| Iron (Fe2+) | no spectral line Fe 3020.64Å |
| Sodium (Na+) | no spectral line Na 3302.3Å and 3302.99Å |
| Lead (Pb2+) | no spectral line Pb 2833.07Å |
| Silicon (Si4+) | spectral line traces Si 2881.58Å |
| Copper (Cu2+) | spectral line traces Cu 3247.54Å and 3273.96Å |



