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Carbon distribution in the humic materials used in this study (%) (13C NMR data).
| Samples | Chemical Shift, ppm | ||||||
|---|---|---|---|---|---|---|---|
| 0–56 | 56–89 | 89–145 | 145–165 | 165–185 | 185–220 | ||
| CAlk | CAlkO | CAr | CArO | COO | C=O | ΣCAr/ΣCAlk | |
| CHL | 26 | 10 | 38 | 9 | 15 | 2 | 1.3 |
| CHP | 9 | 11 | 49 | 11 | 17 | 3 | 3.0 |
| CHG | 21 | 8 | 47 | 8 | 14 | 3 | 1.9 |
| FA | 28 | 17 | 22 | 7 | 21 | 5 | 0.63 |
