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Percentages of water-soluble ions, total carbon, total metals, and SOC in the samples
| Sample mark | Water-soluble ions (%) | Total carbon (%) | Total metals (%) | SOC (%) |
| WH | 25.74 | 17.07 | 0.21 | 8.18 |
| WM | 58.91 | 15.42 | 0.28 | 8.51 |
| WL | 59.37 | 19.06 | 0.50 | 8.90 |
| SH | 28.91 | 14.73 | 0.24 | 7.71 |
| SM | 47.38 | 15.99 | 0.25 | 9.22 |
| SL | 37.77 | 26.62 | 0.51 | 14.26 |
SOC: secondary organic carbon
