pH ≤ 5.5 (4 points) | Cd | Hg | As | Pb | Cr |
Max | 0.16 | 0.06 | 13.90 | 33.23 | 495.25 |
Min | 0.10 | 0.01 | 7.76 | 20.73 | 30.81 |
Mean | 0.14 | 0.03 | 11.04 | 25.56 | 159.67 |
Coefficient of variation | 0.14 | 0.67 | 0.22 | 0.19 | 1.22 |
Risk value | 0.30 | 1.30 | 40.00 | 70.00 | 150.00 |
5.5 < pH ≤ 6.5 (21 points) | Cd | Hg | As | Pb | Cr |
Max | 0.20 | 0.11 | 23.80 | 36.36 | 66.81 |
Min | 0.07 | 0.005 | 3.34 | 19.45 | 28.16 |
Mean | 0.13 | 0.03 | 10.52 | 26.16 | 45.94 |
Coefficient of variation | 0.31 | 1 | 0.45 | 0.15 | 0.21 |
Risk value | 0.30 | 1.80 | 40.00 | 90.00 | 150.00 |
6.5 < pH ≤ 7.5 (45 points) | Cd | Hg | As | Pb | Cr |
Max | 0.28 | 0.14 | 20.85 | 37.76 | 84.24 |
Min | 0.08 | 0.007 | 3.77 | 20.40 | 24.53 |
Mean | 0.14 | 0.03 | 10.17 | 27.52 | 52.56 |
Coefficient of variation | 0.29 | 0.67 | 0.38 | 0.14 | 0.22 |
Risk value | 0.30 | 2.40 | 30.00 | 120.00 | 200.00 |
pH > 7.5 (37 points) | Cd | Hg | As | Pb | Cr |
Max | 0.26 | 0.17 | 34.44 | 39.41 | 76.71 |
Min | 0.08 | 0.00 | 3.88 | 20.49 | 29.80 |
Mean | 0.15 | 0.03 | 10.10 | 28.80 | 54.90 |
Coefficient of variation | 0.27 | 1 | 0.50 | 0.14 | 0.19 |
Risk value | 0.60 | 3.40 | 25.00 | 170.00 | 250.00 |