Complexation of lead in model solutions of humic acid: Heterogeneity and effects of competition with copper, nickel, and zinc

Ismail I. Fasfous, C. L. Chakrabarti*, John Murimboh, Tahir Yapici

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Scopus citations


    Physicochemical heterogeneity of a well characterized humic acid (HA) in its complexation with a trace metal lead in model solutions was investigated using pseudo-polarography at a stationary mercury drop electrode, and the differential equilibrium function (DEF) of Pb(ii)?HA complexes was determined. The complexation of Pb(ii) by HA was determined by taking into account the dependence of the strength of the binding on the metal (Pb) loading. Also investigated were the effects of competition of the trace metals copper, nickel, and zinc on the DEF of Pb(ii)?HA complexes in model solutions. The results showed that these trace metals competed with trace metal lead for binding by HA even when present at the same concentrations as that of lead.

    Original languageEnglish (US)
    Pages (from-to)276-285
    Number of pages10
    JournalEnvironmental Chemistry
    Issue number4
    StatePublished - Sep 13 2006


    • Competition
    • Humic substances
    • Pseudo-polarography
    • Speciation
    • Trace elements

    ASJC Scopus subject areas

    • Chemistry (miscellaneous)
    • Environmental Chemistry
    • Geochemistry and Petrology

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