Table 3.

Ecological hazard assessment of heavy metal metals in soil

Elements	Soil evaluation of AL			Soil evaluation of SB
	${\text{C}}_{\text{f}}^{\text{i}}$	$E_{\text{r}}^{\text{i}}$	RI	${\text{C}}_{\text{f}}^{\text{i}}$	$E_{\text{r}}^{\text{i}}$	RI
Cr	0.18 ± 0.01	0.38	488.70 Strong ecological risk	0.21 ± 0.03	0.42	728.81 Strong ecological risk
Ni	0.27 ± 0.02	1.31		0.30 ± 0.06	1.49
Cu	0.28 ± 0.02	1.48		0.32 ± 0.05	1.61
Zn	0.40 ± 0.09	0.43		0.41 ± 0.08	0.41
As	0.66 ± 0.06	6.86		0.71 ± 0.06	7.05
Cd	2.75 ± 0.31*	84.11#		2.03 ± 0.23*	60.85
Hg	12.55 ± 13.34*	391.11#		16.34 ± 14.97*	653.85#
Pb	0.64 ± 0.06	3.02		0.62 ± 0.04	3.12

Elements	Soil evaluation of RA			Soil evaluation of SG
	${\text{C}}_{\text{f}}^{\text{i}}$	$E_r^i$	RI	${\text{C}}_{\text{f}}^{\text{i}}$	$E_r^i$	RI
Cr	0.27 ± 0.01	0.54	1011.77 Strong ecological risk	0.18 ± 0.00	0.36	597.73 Strong ecological risk
Ni	0.37 ± 0.03	1.84		0.26 ± 0.01	1.35
Cu	0.45 ± 0.17	2.27		0.27 ± 0.02	1.42
Zn	0.45 ± 0.13	0.45		0.40 ± 0.06	0.4
As	0.77 ± 0.08	7.71		0.65 ± 0.03	6.59
Cd	2.54 ± 0.28*	76.07		2.65 ± 0.29*	82.45#
Hg	22.97 ± 16.84*	918.95#		14.52 ± 6.04*	501.95#
Pb	0.79 ± 0.18	3.93		0.64 ± 0.05	3.21

Annotation: * means higher than the local surface reference value; # indicates prominent ecological risk. Values were highlight with bold, which means higher than the standards instead of representing a statistical difference