Lability of Cd, Cr, Cu, Mn and Pb complexed by aquatic humic substances
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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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