Competitive Adsorption of Cadmium (II) from Aqueous Solutions onto Nanoparticles of Water Treatment Residual

Table 1

Some physical and chemical characteristics of studied drinking water treatment residuals (WTRs).

Characteristics^‡	Units	WTRs^†
pH		7.45 ± 0.06
EC	dS m^−1	1.67 ± 0.04
O.M^‡	g kg^−1	57.00 ± 2.00
KCl-Al	mg kg^−1	28.18 ± 1.03
Olsen-P	mg kg^−1	24.00 ± 2.00
CEC	Cmol(+)kg^−1	34.78 ± 0.34
Total elements
N	g kg^−1	4.20 ± 0.13
P	g kg^−1	1.90 ± 0.15
K	g kg^−1	2.20 ± 0.21
Al	g kg^−1	38.01 ± 0.93
Ni	mg kg^−1	9.40 ± 0.07
Pb	mg kg^−1	76.00 ± 0.17
Cu	mg kg^−1	49.00 ± 0.02
Hg	mg kg^−1	1.04 ± 0.02

Means of three samples ± SD. ^‡EC: elctric conductivity; O.M: organic matter; CEC: cation exchange capacity.