Table 1.
Contents of metals in source river sediments, wetland sediments/soils as compared with regional background levels
| Heavy metal | Range mg/kg | Mean mg/kg | CV | Source mg/kg | Background mg/kg | Major metal | Range | Mean | CV | Source | Background |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Cd | 0.05–0.28 | 0.12 | 38.80% | 0.09 | 0.15 | K | 1.16–8.50% | 3.74% | 38.83% | 1.79% | 2.03% |
| Cr | 70.32–251.95 | 121.57 | 25.70% | 151.07 | 77.55 | Na | 0.42–24.28% | 8.10% | 61.80% | 7.37% | 1.08% |
| Cu | 12.33–39.33 | 22.07 | 21.33% | 32.34 | 30.85 | Ca | 0.21–12.58% | 3.03% | 110.06% | 4.34% | 0.69% |
| Ni | 21.74–73.70 | 38.93 | 23.52% | 55.88 | 32.40 | Mg | 0.22–2.02% | 0.70% | 63.68% | 0.95% | 0.92% |
| Zn | 1.96–427.93 | 112.95 | 61.64% | 167.52 | 92.67 | Al | 0.97–16.84% | 9.69% | 33.25% | 6.41% | 7.57% |
| Pb | 5.22–64.20 | 25.37 | 48.67% | 14.68 | 30.35 | Fe | 2.45–4.93% | 3.76% | 11.53% | 3.54% | 3.23% |
Note: n = 84; CV: coefficient of variation; Background levels are contents in the surface soils of the Hangzhou–Jiaxing–Huzhou plain (Wang et al. 2007).