Evaluation of Geophagy Clay Capacity in Adsorbing Cd²⁺ and Pb²⁺ for Water Treatment in Southeast Nigeria

Table 1

Results of metal analysis of the studied clay (mg/kg).

	Top layer	Middle	Bottom	Food (WHO)	Soil (WHO)
Pb	6.33 ± 0.54^ab	7.70 ± 0.47^b	12.4 ± 1.45^c	0.3	25
Zn	2.00 ± 0.20^a	2.75 ± 0.46^b	1.90 ± 0.20^a	300	100
Ni	0.86 ± 0.06^ab	0.93 ± 0.21^ab	1.47 ± 0.51^b
Co	0.23 ± 0.06^a	0.43 ± 0.12^a	1.50 ± 0.89^b
Mn	15.0 ± 0.00^b	13.3 ± 2.04^ab	11.0 ± 2.00^a	500	2000
Fe	4366 ± 245^ab	4400 ± 140^ab	15233 ± 238^b	425	50000
Cd	0.01 ± 0.00	0.01 ± 0.00	0.01 ± 0.00	0.1	3
Ca	300 ± 100^b	100 ± 0.00^a	100 ± 0.00^a
P	26.7 ± 11.5^a	30.0 ± 10^a	40.0 ± 0.00^a
Al	3466 ± 611^ab	4166 ± 416^b	5333 ± 513^c
Na	10.0 ± 0.00^a	13.3 ± 5.77^a	10.0 ± 0.00^a
Hg	0.02 ± 0.01^ab	0.02 ± 0.00^b	0.02 ± 0.002^b

Values carrying different superscripts along the same row differ significantly .