Siderophores are low molecular weight organic ligands exuded by some aerobic organisms and plants to acquire Fe under Fe-limited conditions. The hydroxamate siderophores may sorb to aluminosilicate clays through a variety of mechanisms depending upon the nature of the clay and of the siderophore along with solution conditions such as pH, ionic strength, and presence of metal cations. They may also affect metal binding to clays. Here, we review previous studies of siderophore sorption to aluminosilicate clays; briefly discuss how the techniques of X-ray diffractometry, Fourier-transform infrared spectroscopy, and X-ray absorption spectroscopy may be applied to such studies; review effects of siderophores on metal sorption to clays; and highlight some areas for future research.
KeywordsSiderophore Clay Sorption Metals XRD FTIR EXAFS
The authors thank the NSF-funded (NSF-EAR02-21966) Environmental Molecular Science Institute at the University of Notre Dame and the Department of Energy, Office of Science (DOE-DE-FG02-02ER15323) for funding aspects of their siderophore-related research as reviewed in this chapter.
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