| Sampling stations | Heavy metal (mg/kg) | PLI | ||||||
| Fe | Mn | Cu | Pb | Cd | Ni | Zn | ||
| KV-1 | 1912.0 | 302.50 | 10.25 | 80.25 | 2.0 | 0.50 | 31.50 | 0.43 |
| KV-2 | 53308.0 | 368.0 | 49.0 | 104.25 | 3.5 | 94.25 | 103.75 | 2.51 |
| KV-6 | 57626.0 | 18.0 | 54.25 | 111.50 | 3.0 | 94.5 | 110.50 | 2.55 |
| KV-9 | 3205.0 | 25.50 | 19.0 | 17.0 | ND | ND | 16.0 | 0.39 |
| KV-11 | 18726.50 | 58.75 | 22.25 | 78.25 | 3.25 | 41.0 | 68.50 | 1.56 |
| KV-12 | 16633.0 | 49.0 | 13.25 | 89.75 | ND | 32.50 | 45.25 | 0.79 |
| KV-13 | 9955.0 | 42.0 | 14.50 | 76.50 | 1.75 | 1.75 | 38.0 | 0.59 |
| KVVP-1 | 4907.50 | 21.75 | 12.0 | 76.50 | 2.0 | 5.75 | 36.50 | 0.74 |
| KVE-1 | 1201.0 | 14.0 | 10.50 | 37.0 | ND | ND | 20.50 | 0.45 |
| KVPB-2 | 3186.0 | 33.50 | 14.25 | 76.0 | 2.25 | 7.0 | 51.0 | 0.87 |
| Average shale | 46,700 | 900 | 45 | 20 | 0.3 | 68 | 95 |
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