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 | 97 | 94 | 94 | 97 | 99 | 95 |
0~1 | 1 | 轻度污染 | 3 | 6 | 6 | 3 | 1 | 5 |
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 | - | - | −1.14 | −0.67 | −0.74 | −0.54 | −1.03 | −0.43 |