Heavy Metal Contamination of Soils around a Hospital Waste Incinerator Bottom Ash Dumps Site

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.