|
Abundance of six forms of Se in sequential extraction fractions of the bulk sample (in μg/g) and fraction of each form of Se in three coals (in %) |
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| Bituminous coal |
Anthracite |
Cokeite |
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|
|
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| Content (μg/g) |
Fraction (%) |
Content (μg/g) |
Fraction (%) |
Content (μg/g) |
Fraction (%) |
|
|
|
||||||
| Water-leachable |
ND |
0.00 |
0.063 |
3.23 |
0.057 |
3.45 |
| Ion-exchangeable |
0.128 |
4.66 |
0.138 |
7.14 |
0.186 |
11.3 |
| Organic matter-bound |
1.08 |
39.1 |
0.219 |
11.3 |
ND |
0.00 |
| Carbonate-bound |
0.093 |
3.36 |
0.224 |
11.6 |
0.245 |
14.9 |
| Sulfide-bound |
0.581 |
21.1 |
0.975 |
50.4 |
0.895 |
54.5 |
| Silicate-bound |
0.875 |
31.8 |
0.316 |
16.4 |
0.259 |
15.8 |
| Total |
2.76 |
100 |
1.93 |
100 |
1.64 |
100 |
| Bulk coal (μg/g) |
4.00 |
2.43 |
2.00 |
|||
| Recovery (%) |
68.9 |
79.5 |
82.1 |
|||
|
Abbreviation: ND, not detected | ||||||
Zhang et al. Geochemical Transactions 2007 8:14 doi:10.1186/1467-4866-8-14 |
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