Lability of heavy metal species in aquatic humic substances characterized by ion exchange with cellulose phosphate

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Rocha, J. C.
Toscano, IAS
Burba, P.

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Elsevier B.V.


Labile metal species in aquatic humic substances (HSs) were characterized by ion exchange on cellulose phosphate (CellPhos) by applying an optimized batch procedure. The HSs investigated were pre-extracted from humic-rich waters by ultrafiltration and a resin XAD 8 procedure. The HS-metal species studied were formed by complexation with Cd(II), Ni(II), Cu(II), Mn(II) and Pb(II) as a function of time and the ratio ions to HSs. The kinetics and reaction order of this exchange process were studied. At the beginning (<3 min), the labile metal fractions are separated relatively quickly. After 3 min, the separation of the metal ions proceeds with uniform half-lives of about 12-14 min, revealing rather slow first-order kinetics. The metal exchange between HSs and CellPhos exhibited the following order of metal lability with the studied HSs: Cu > Pb > Mn > Ni > Cd. The required metal determinations were carried out by atomic absorption spectrometry.



aquatic humic substances, cellulose phosphate, heavy metal species, ion exchange, lability

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Talanta. Amsterdam: Elsevier B.V., v. 44, n. 1, p. 69-74, 1997.