Sample

Concentration in ppm

Hg

Pb

As

Cd

BS1

4.53 ± 0.21

5.80 ± 2.19

2.14 ± 0.98

ND

BS2

3.87 ± 0.85

5.48 ± 2.51

1.95 ± 0.67

ND

BS3

3.93 ± 0.36

8.93 ± 2.92

1.82

ND

BS4

2.96 ± 0.50

5.21 ± 1.54

0.78 ± 0.42

ND