As | Pb | Hg | Cr | Cd | |
范围 | 1.10~55.46 | 8.80~243.00 | 0~1.81 | 46.20~299.95 | 0~4.80 |
平均值 ± 标准差 | 15.51 ± 6.48 | 40.26 ± 32.09 | 0.52 ± 0.34 | 75.60 ± 26.30 | 0.33 ± 0.64 |
变异系数(%) | 41.81 | 79.71 | 65.38 | 34.79 | 193.94 |
超标率(%) | 20.36 | 0 | 0 | 8.98 | 0 |
太原市 [21] | 10.96 | 26.29 | 0.12 | 73.69 | 0.21 |
北京 [22] | - | 23.30 | - | 61.00 | 0.13 |
上海 [7] | - | 28.86 | - | 87.72 | - |
广州 [23] | - | 65.40 | - | 22.40 | 0.23 |
南京 [24] | - | 107.30 | - | 84.70 | - |
江苏背景值 | 10 | 26.2 | 0.29 | 77.8 | 0.13 |
一类筛选值(GB36600-2018) | 20 | 400 | 8 | 90 | 20 |