METHODS FOR SAMPLING AND
INORGANIC ANALYSIS OF COAL
U.S. Geological Survey
Bulletin 1823
Edited by D.W. Golightly and F.O. Simon
Table 17. Estimated precision of analysis
| Concentration (percent, w/w) |
Relative Standard Deviation (percent) |
| >10 | 1 to 2 |
| 1 to 10 | 2 to 10 |
| 0.1 to 1 | 10 to 50 |
| <0.1 | 50 to 100 |
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