Pb(II) and Eu(III) adsorption by goethite in the presence of natural and synthetic hydroxamate siderophores

Stephan Krämer, Jide Xu, Kenneth N. Raymond, Garrison Sposito

    Publications: Contribution to journalArticlePeer Reviewed

    Abstract

    Trihydroxamate siderophores have been proposed for use as mediators of actinide and heavy metal mobility in contaminated subsurface zones. These microbially produced ligands, common in terrestrial and marine environments, recently have been derivatized synthetically to enhance their affinity for transuranic metal cations. However, the interactions between these synthetic derivative and adsorbed trace metals have not been characterized. In this paper we compare a natural siderophore, desferrioxamine-B (DFO-B), with its actinide-specific catecholate derivative, N-(2,3-dihydroxy-4-(methylamido)benzoyl)-desferrioxamine-B (DFOMTA), as to their effect on the adsorption of Pb(II) and Eu(III) by goethite and boehmite. In the presence of 240 ?M DFO-B, a strongly depleting effect on Eu(III) adsorption by goethite and boehmite occurred above pH 6. By contrast, almost total removal of Eu(III) from solution in the neutral to slightly acidic pH range was observed in the presence of either 10 or 100 ?M DFOMTA, due primarily to the formation of metal-DFOMTA precipitates. Addition of DFOMTA caused an increase in Pb(II) adsorption by goethite below pH 5, but a decrease above pH 5, such that the Pb(II) adsorption edge in the presence of DFOMTA strongly resembled the DFOMTA adsorption envelope, which showed a maximum near pH5 and decreasing adsorption toward lower and higher pH.
    Original languageEnglish
    Pages (from-to)1287-1291
    Number of pages5
    JournalEnvironmental Science & Technology
    Volume36
    Issue number6
    Publication statusPublished - 2002

    Austrian Fields of Science 2012

    • 105105 Geochemistry

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