METHODS FOR SAMPLING AND
INORGANIC ANALYSIS OF COAL
U.S. Geological Survey
Bulletin 1823
Edited by D.W. Golightly and F.O. Simon
Table 12. Concentration ranges provided by rock standards for the XRF analysis of coal ash
| Concentration (percent) | ||
| Oxide | Lowest standard | Highest standard |
| Na2O | 0.06 | 8.37 |
| MgO | 0.10 | 43.50 |
| Al2O3 | 0.73 | 54.53 |
| SiO2 | 4.43 | 87.21 |
| P2O5 | 0.01 | 34.50 |
| K2O | 0.03 | 10.03 |
| CaO | 0.08 | 50.50 |
| TiO2 | 0.01 | 2.69 |
| MnO | 0.01 | 0.77 |
| Fe2O3 | 1.00 | 25.76 |
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