Table 1 Distribution test and fitting results of HM contents.
Element | Mean | Median | Standard deviation | Minimum | Maximum | Distribution |
|---|---|---|---|---|---|---|
As | 7.3 | 6.8 | 2.3 | 5 | 16.3 | Lognormal |
Ba | 662.1 | 652.2 | 157.2 | 399.5 | 1084.5 | Logistic |
Cr | 178.7 | 180.5 | 98.6 | 60.9 | 378.3 | Beta |
Co | 33.7 | 35.2 | 22.2 | 7.8 | 67.1 | Beta |
Cu | 38.7 | 35.9 | 10.1 | 23.3 | 61.1 | Lognormal |
Ni | 26.0 | 24.5 | 5.1 | 18.2 | 41.6 | Max Extreme |
Pb | 51.0 | 42.3 | 41.2 | 21.2 | 211.3 | Lognormal |
Mn | 646.7 | 651.3 | 131.6 | 411.2 | 975.6 | Beta |
Zn | 185.0 | 195.4 | 57.2 | 75.7 | 306.3 | Beta |
V | 66.7 | 63.7 | 10.1 | 52.5 | 93.1 | Lognormal |
