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 | 100 | 91 | 100 | 100 | 79 | 97 |
0~1 | 1 | 轻度污染 | 0 | 9 | 0 | 0 | 21 | 3 |
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 | - | - | −0.99 | −1.18 | −0.77 | −0.74 | −0.68 | −0.45 |