地累积指数(Igeo) | 污染等级 | 污染程度 | 所占比例(%) | |||||
Pb | Cd | Cu | Ni | Hg | As | |||
≤0 | 0 | 无污染 | 98 | 92 | 99 | 97 | 96 | 98 |
0~1 | 1 | 轻度污染 | 2 | 8 | 1 | 3 | 4 | 2 |
1~2 | 2 | 偏中度污染 | 0 | 0 | 0 | 0 | 0 | 0 |
2~3 | 3 | 中度污染 | 0 | 0 | 0 | 0 | 0 | 0 |
3~4 | 4 | 偏重污染 | 0 | 0 | 0 | 0 | 0 | 0 |
4~5 | 5 | 重污染 | 0 | 0 | 0 | 0 | 0 | 0 |
>5 | 6 | 严重污染 | 0 | 0 | 0 | 0 | 0 | 0 |
平均值 | - | - | −0.85 | −0.23 | −0.76 | −0.58 | −0.79 | −0.42 |