Research Article
Humification and Humic Acid Composition of Suspended Soil in Oligotrophous Environments in South Vietnam
Table 3
Carbon species in humic acids of soils investigated.
| Sample | Chemical shifts values (ppm) and related carbon species content | | 190–170 | 170–150 | 150–135 | 135–108 | 108–100 | 100–70 | 70–50 | 50–32 | 32–27 | 27–10 | 10–0 | Aromatic | Aliphatic |
| 1 | 9.00 | 8.90 | 6.64 | 17.25 | 4.16 | 14.81 | 13.32 | 12.15 | 4.99 | 8.41 | 0.38 | 0.36 | 0.64 | 2 | 9.01 | 8.01 | 6.15 | 15.22 | 4.33 | 15.33 | 15.35 | 12.17 | 5.06 | 8.99 | 0.39 | 0.33 | 0.67 | 3 | 8.33 | 8.60 | 6.68 | 16.30 | 4.16 | 15.23 | 14.94 | 12.29 | 5.00 | 8.17 | 0.31 | 0.34 | 0.66 | Average | 8.78 | 8.50 | 6.49 | 16.25 | 4.21 | 15.12 | 14.54 | 12.20 | 5.01 | 8.52 | 0.36 | 0.34 | 0.66 |
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