Treatment^y

Heavy metal concentration levels (mg/kg)

Pb

Cr

Cd

Cu

Fe

Hg

Residential

0.00a

0.12a

0.00a

38.2a

2.67a

0.0

Market

0.00a

0.10a

0.00a

31.9a

1.63a

0.0

Educational

1.99a

2.04a

1.25a

30.2a

3.97a

0.0