C_f

Pb

Cd

Fe

Mn

Cu

Cr

Zn

Cd

S1

8.05

2.5

0.58

0.69

0

4.3

0.28

16.4

S2

7.77

2.3

0.71

0.73

0

1.6

0.36

13.47

S3

13.8

2.4

1.99

0.59

2.5

0.43

0.3

22.01

S4

0

3

0.93

0.92

0.9

0.93

0.71

7.39

S5

0.7

3.2

0.96

0.85

0.93

1.4

1.03

9.07

S6

8

2.4

1.6

0.91

1

2.28

1.3

17.49

S7

8

2.3

1.71

0.79

1.87

3.09

0.21

17.97

Mean

6.6

2.5

1.2

0.7

1.02

2

0.59

14.8