Area Item Cu Zn Pb Cd As Hg Cr Ni pH
Liaoning province (n=12)
Average
37.1
112.6
23.6
0.20
6.8
0.061
51.9
21.7
6.5
Maximum 68.6 190.4 31.6 0.42 9.3 0.145 74.3 27.4 7.2
Minimum 13.6 48.5 17.9 0.08 3.5 0.018 40.0 12.9 5.9
Background 19.8 63.5 21.4 0.11 8.8 0.037 57.9 25.6 6.6
Hebei province (n=15)
Average
23.4
110.0
22.1
0.22
9.5
0.032
62.5
26.3
7.9
Maximum 32.1 152.2 27.1 0.35 13.8 0.055 85.6 33.4 8.4
Minimum 16.4 60.5 17.8 0.11 6.3 0.016 49.3 19.4 7.2
Background 21.8 78.4 21.5 0.09 13.6 0.036 68.3 30.8 7.9
Shandong province (n=17)
Average
28.4
123.9
19.6
0.27
7.5
0.040
67.3
30.7
7.9
Maximum 57.8 272.4 23.9 0.57 10.2 0.070 134.2 47.8 8.8
Minimum 17.8 60.1 16.8 0.18 4.4 0.020 47.8 23.1 6.6
Background 24.0 63.5 25.8 0.08 9.3 0.019 66.0 25.8 7.7
Henan province (n=16)
Average
65.6
167.3
24.6
0.58
11.1
0.062
54.3
25.9
7.4
Maximum 128.1 273.8 32.2 1.22 14.9 0.143 66.6 32.8 7.6
Minimum 16.6 65.0 17.6 0.21 9.2 0.017 47.0 21.1 7.0
Background 19.7 60.1 19.6 0.07 11.4 0.034 63.8 26.7 7.8
Shaanxi province (n=18)
Average
26.6
87.4
22.2
0.22
12.6
0.090
76.5
30.1
8.3
Maximum 50.6 119.8 32.6 0.48 16.2 0.267 291.5 54.9 9.1
Minimum 16.8 61.2 17.6 0.13 9.6 0.013 51.6 24.3 7.4
Background 21.4 69.4 21.4 0.09 11.1 0.030 62.5 28.8 8.3
Ningxia Autonomous Region (n=11)
Average
25.2
81.7
17.4
0.17
9.4
0.033
46.2
22.2
8.0
Maximum 53.1 169.0 21.5 0.49 14.9 0.179 55.6 27.6 8.5
Minimum 13.8 45.1 14.1 0.08 4.8 0.007 30.6 14.6 7.5
Background 22.1 58.8 20.6 0.11 11.9 0.021 60.0 36.5 8.0
Jiangsu province (n=12)
Average
17.2
78.7
19.9
0.12
7.1
0.050
61.7
26.4
7.6
Maximum 21.5 100.7 22.3 0.20 8.9 0.085 71.6 31.5 8.1
Minimum 14.1 70.1 18.2 0.08 5.2 0.027 55.1 21.8 6.7
Background 22.3 62.5 26.2 0.13 10.0 0.029 77.8 26.7 7.8
Yunnan province (n=25)
Average
106.6
140.5
70.2
1.28
10.7
0.125
98.3
48.2
6.7
Maximum 202.2 250.8 322.1 6.67 45.6 0.376 163.9 101.1 8.6
Minimum 26.4 70.0 18.6 0.31 1.7 0.019 52.2 22.9 4.6
Background 46.3 89.7 40.6 0.22 18.4 0.058 65.2 42.5 5.7
Whole area (n=132)
Average
47.2
115.6
31.4
0.47
9.6
0.069
68.9
31.0
7.5
Maximum 202.2 273.8 322.1 6.67 45.6 0.376 291.5 101.1 9.1
Minimum 13.6 45.1 14.1 0.08 1.65 0.007 30.6 12.9 4.6
National background value 22.6 74.2 26.0 0.10 11.2 0.065 61.0 26.9 6.7
Over standard rate (%)[a] / 15.2 4.5 3.0 27.3 2.3 0.0 0.0 1.5 /