Table 1.
Coal Samples
| Sample #a | Origin | Coal type | Surface area (m2/g)b | Sulfur (mass fraction)c | Pyritic sulfur (mass fraction)c | Pyritic sulfur content per surface area (g/m2) | Iron release (μM)d |
| 1635 | Erie, Colorado | subbituminous | 1.79 | 0.3616 | 0.00 | 0 | 0.00 |
| 2682b | Gillette, Wyoming | subbituminous | 4.94 | 0.4917 | 0.01 | 0.002 | 0.02 |
| 2692b | Holden, West Virginia | bituminous | 1.35 | 1.17 | 0.49 | 0.363 | 0.48 |
| 2684b | Marion, Illinois | bituminous | 2.11 | 3.076 | 0.52 | 0.246 | 8.31 |
| 2685b | Captina, West Virginia | bituminous | 1.72 | 4.73 | 1.15 | 0.669 | 13.3 |
a National Institute of Standards & Technology sample numbers
b BET surface area values are for coal as received and as used in experiments, not dessicated.
c dry basis
d 0.125 m2/L coal loadings, total iron [i.e., Fe(II) & Fe(III)] after 7 hrs in 1.5 mg/L RNA solution