From: Determination of some heavy metals from aqueous solutions using modified Amberlite XAD-4 resin by selective solid-phase extraction
Metal
Electrolytes or metal ions (M)
NaCl
KBr
KI
NaNO3
Na2SO4
Na3PO4
Ca(II)
Mg(II)
Pb(II)
0.10
0.12
0.05
0.04
Cd(II)
0.15
0.14
0.06