Table 5.

Heavy metals concentrations of monitoring well samples at Alexandria’s solid waste sanitary landfills, Egypt.

Heavy metals	Unit	Well 1				Well 2
n = 12		Min	Max	$\overline{x}\pm \text{SD}$	p-Value	Min	Max	$\overline{x}\pm \text{SD}$	p-Value
Nickel	mg/l	0.01	0.152	0.057 ± 0.020	.424	0.007	0.147	0.029 ± 0.013	.052
Lead	mg/l	0.004	0.009	0.005 ± 0.001	.746	0.002	0.005	0.0010 ± 0.0001	.083
Copper	mg/l	0.004	0.067	0.026 ± 0.014	.829	0.001	0.026	0.013 ± 0.007	.024
Manganese	mg/l	0.182	0.673	0.357 ± 0.210	.000⁎	0.039	0.439	0.257 ± 0.190	.000⁎
Chromium	mg/l	0.006	0.158	0.039 ± 0.015	.515	ND†	0.058	0.028 ± 0.008	.069
Cadmium	mg/l	0.001	0.051	0.011 ± 0.006	.107	ND†	0.027	0.005 ± 0.001	.000⁎
Zinc	mg/l	0.001	0.343	0.148 ± 0.032	.281	0.001	0.153	0.043 ± 0.021	.000⁎
Iron	mg/l	0.044	5.90	1.23 ± 0.74	.352	0.014	3.53	0.456 ± 0.300	.000⁎

95% CI = 1.96.

^⁎Significant at p ⩽ 0.05.

^†ND: Not Detected; the detection level was 0.01 ppm.