Table 1 Descriptive statistical analysis of heavy metal concentration in soil (mg kg−1)
Heavy metal | Maximum | Minimum | Mean | SD | CV/% | Soil background value in Chongqing [32] | Point over-standard rate/% |
|---|---|---|---|---|---|---|---|
As | 21.180 | 1.965 | 5.802 | 3.2323 | 55.71 | 6.620 | 28.07% |
Cu | 76.600 | 6.208 | 23.992 | 8.572 | 35.73 | 24.600 | 33.63% |
Mn | 1584.000 | 107.900 | 573.316 | 184.685 | 32.21 | 615.000 | 33.92% |