Metal

Not polluted

Moderately polluted

Heavily polluted

Present study

Ag

-

-

-

1.1 - 5.3

Cu

<25

25 - 50

>50

11 - 75

Ni

<20

20 - 50

>50

18 - 65

Pb

<40

40 - 60

>60

1.1 - 5.3

Co

-

-

-

18 - 54

Cr

<25

25 - 75

>75

68.9 - 251

Mn

<300

300 - 500

>500

229 - 1100