Table 4.

Mean concentrations of heavy metals in soils at different sampling points.

Soil sites	Mean concentrations of metals (mg/kg)
	Hg	Pb	Zn	Ag	Cr	Cd
20	8.41 ± 0.01	334.83 ± 0.06	910.33 ± 0.48	20.30 ± 0.00	42.24 ± 0.01	4.50 ± 0.02
40	7.51 ± 0.02	208.33 ± 0.58	848.97 ± 0.06	16.47 ± 0.06	40.30 ± 0.10	3.53 ± 0.06
60	4.27 ± 0.03	101.33 ± 0.59	502.33 ± 0.58	5.53 ± 0.06	53.67 ± 0.29	2.03 ± 0.06
80	1.74 ± 0.01	32.83 ± 0.06	245.33 ± 0.59	<0.5 ± 0.00	42.33 ± 0.58	1.24 ± 0.01
100	<0.5 ± 0.0	15.53 ± 0.04	17.00 ± 0.00	<0.5 ± 0.00	14.63 ± 0.23	0.25 ± 0.01
1200	0.50 ± 0.02	4.85 ± 0.10	15.00 ± 0.50	<0.5 ± 0.00	2.32 ± 0.12	0.5 ± 0.01
∗Allowable limits	0.3	100	70	NA	75.0	3.0

^∗Allowable levels of heavy metals in soils.

NA: not available.