X-ray absorption spectroscopy (XAS) of toxic metal mineral transformations by fungi

Marina Fomina, John Charnock, Andrew D. Bowen, Geoffrey M. Gadd

    Research output: Contribution to journalArticlepeer-review

    54 Citations (Scopus)

    Abstract

    Fungi can be highly efficient biogeochemical agents and accumulators of soluble and particulate forms of metals. This work aims to understand some of the physico-chemical mechanisms involved in toxic metal transformations focusing on the speciation of metals accumulated by fungi and mycorrhizal associations. The amorphous state or poor crystallinity of metal complexes within biomass and relatively low metal concentrations make the determination of metal speciation in biological systems a challenging problem but this can be overcome by using synchrotron-based element-specific X-ray absorption spectroscopy (XAS) techniques. In this research, we have exposed fungi and ectomycorrhizas to a variety of copper-, zinc- and lead-containing minerals. X-ray absorption spectroscopy studies revealed that oxygen ligands (phosphate, carboxylate) played a major role in toxic metal coordination within the fungal and ectomycorrhizal biomass during the accumulation of mobilized toxic metals. Coordination of toxic metals within biomass depended on the fungal species, initial mineral composition, the nitrogen source, and the physiological state/age of the fungal mycelium.
    Original languageEnglish
    Pages (from-to)308-321
    Number of pages14
    JournalEnvironmental Microbiology
    Volume9
    Issue number2
    DOIs
    Publication statusPublished - 2007

    Keywords

    • X-ray absorption spectroscopy (XAS)
    • Toxic metal
    • Physico-chemical mechanisms

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