Soil Heavy Metal Distribution with Depth around a Closed Landfill and Their Uptake by Datura stramonium

Table 2

Correlation coefficient between soil properties and heavy metals at different depths.

	Soil depth = 0–30 cm
	Sand	Silt	Clay	pH	CEC	EC	OM	Fe	Ni	Zn	Cd	Cr	Cu
Fe	−0.46	0.34	0.58	−0.02	0.75	0.05	−0.55	1
Ni	−0.13	0.11	0.19	0.07	0.26	−0.29	0.32	0.16	1
Zn	−0.40	0.48	0.18	0.01	0.21	−0.58	−0.03	0.29	0.39	1
Cd	−0.23	0.17	0.29	−0.03	0.17	0.12	−0.68	0.36	−0.44	0.28	1
Cr	−0.02	−0.03	0.19	0.28	0.52	0.52	−0.73	0.58	0.10	0.01	0.57	1
Cu	−0.09	0.13	0.04	0.34	0.37	0.49	−0.65	0.36	−0.45	−0.22	0.66	0.71	1
	Soil depth = 30–60 cm
Fe	−0.10	0.22	0.33	−0.53	0.44	−0.20	−0.58	1
Ni	−0.15	0.53	0.53	−0.14	0.50	−0.29	−0.18	0.43	1
Zn	0.47	−0.04	−0.36	0.35	−0.10	0.67	0.26	−0.73	−0.24	1
Cd	−0.24	0.62	0.04	−0.63	0.64	0.20	−0.56	0.36	0.55	−0.04	1
Cr	0.54	−0.67	−0.38	0.53	−0.55	0.18	0.18	−0.30	−0.69	0.15	−0.74	1
Cu	0.28	0.27	−0.20	0.02	0.34	0.63	−0.17	−0.29	−0.02	0.74	0.21	−0.18	1
	Soil depth = 60–90 cm
Fe	0.12	0.13	0.02	0.15	0.28	0.18	−0.37	1
Ni	−0.16	0.42	0.58	−0.38	0.46	−0.23	0.02	−0.20	1
Zn	−0.11	0.31	0.48	−0.37	0.35	−0.22	0.10	−0.32	0.96	1
Cd	−0.12	0.09	0.35	−0.35	0.33	−0.35	−0.42	0.58	−0.07	−0.08	1
Cr	0.75	−0.80	−0.63	−0.00	−0.66	0.36	−0.14	0.08	−0.40	−0.39	−0.14	1
Cu	0.10	0.01	0.06	−0.13	0.30	0.06	−0.73	0.64	−0.24	−0.30	0.81	0.08	1