Keywords
cellulose modified with p-aminobenzoic groups
lability of metal species
How to Cite
Abstract
The lability of Cd(II), Cr(III), Cu(II), Mn(II) and Pb(II) complexed by humic substances (HSs)was investigated by means of ion exchange on cellulose modified with p-aminobenzoic groups (Cell-PAB),
using a batch procedure. The HSs were extracted from water samples using adsorption in a column packed
with XAD 8 resin. The metal-HS complexes were prepared by adding solutions containing all the
aforementioned metal ions ( Cd(II), Cr(III), Cu(II), Mn(II) and Pb(II) ). The results indicated that the
distribution coefficients (Kd) of Cell-PAB decreased with the presence of HSs, and that the lability of metal
fractions complexed by HSs decreases in pH values > 4.0, complexation time > 10 h and HS concentration
> 500 mg L -1 . The metal exchange between HSs and Cell-PAB exhibited the following order of metal ion
lability: Cd < Pb < Mn ≅ Cr < Cu.
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