Table 1.

Heavy metal concentrations in soil (mg/kg)

Heavy metal	Contaminated soils (n = 18)		Reference soils (n = 14)		MAL	Backgroundvalue
	Range	Mean	Range	Mean
Cu	32.35–321.99	128.48 ± 101.36	17.33–47.04	28.33 ± 11.31	50	25.63
As	10.16–56.42	20.09 ± 11.60	4.74–10.48	8.01 ± 2.14	30	16.58
Cd	0.20–2.45	1.38 ± 0.81	0.03–0.22	0.13 ± 0.05	0.3	0.175
Pb	19.54–87.56	55.16 ± 22.40	17.88–24.83	21.41 ± 2.26	250	43.35

Concentrations are presented in mg/kg. The mean is presented with the standard deviation.

Cu, copper; As, arsenic; Cd, cadmium; Pb, lead; MAL, maximum allowable level.