Sampling sites

Background Concentrations

Enrichment Factor (EF)

Cu

Zn

Pb

Cd

Ni

1

World average shale

1.50^b

1.68^b

3.16^c

9.23^d

0.54^a

2

2.68^b

7.19^d

2.41^b

7.74^d

0.87^a

3

2.06^b

5.62^d

4.46^c

8.91^d

1.00^b

4

0.75^a

1.74^b

1.25^b

5.15^d

0.42^a

5

1.20^b

3.70^c

4.33^c

6.79^d

0.47^a

6

0.44^a

1.64^b

2.10^b

5.72^d

0.26^a

1

Present study

2.81^b

0.96^a

9.89^d

1.79^b

1.29^b

2

5.02^d

4.12^c

7.55^d

1.50^b

2.09^b

3

3.85^c

3.23^c

13.96^e

1.72^b

2.41^b

4

1.40^b

1.00^b

3.93^c

1.00^b

1.00^b

5

2.24^b

2.12^b

13.55^e

1.31^b

1.13^b

6

0.82^a

0.94^a

6.59^d

1.11^b

0.61^a