| Cr | Pb | Cd | As | Hg | pH |
样品数(个) | 30 | 30 | 30 | 30 | 30 | 30 |
范围值(mg/kg) | 4.23~165 | 5.92~116 | 0.02~0.21 | 0.39~32.70 | 0.02~0.10 | 4.30~6.20 |
均值(mg/kg) | 39.26 | 30.89 | 0.08 | 2.49 | 0.04 | 4.91 |
标准差(mg/kg) | 34.21 | 20.11 | 0.04 | 5.72 | 0.02 | 0.46 |
变异系数(%) | 87 | 65 | 55 | 230 | 53 | 9 |