Heavy Metal-Mineral Associations in Coeur d'Alene River Sediments: A Synchrotron-Based Analysis

Date

2009-07-01

Author

Moberly, James G.
Borch, Thomas
Sani, Rajesh K.
Spycher, Nicolas F.
Şengör, Sema Sevinç
Ginn, Timothy R.
Peyton, Brent M.

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Nearly a century of mining activities upstream have contaminated Lake Coeur d'Alene and its tributaries with Pb, Zn, and other heavy metals. Heavy metal concentrations in sediments of the Coeur d'Alene watershed have been shown to be inversely proportional to the sediment size fraction; thus, analysis on a very small scale is essential to determine the mobility and stability of heavy metals in this environment. Micron-scale synchrotron-based methods were used to determine the association of heavy metals with solid phases in sediments of the Coeur d'Alene River. Bulk X-ray diffraction (XRD), extended X-ray absorption fine structure spectroscopy, and synchrotron-based microfocused XRD combined with microfocused X-ray fluorescence mapping indicate the presence of crystalline Pb- and Zn-bearing mineral phases of dundasite [Pb2Al4(CO3)(4)(OH)(8)center dot 3H(2)O], coronadite [PbMn8O16], stolzite [PbWO4], mattheddleite [Pb-10(SiO4)(3.5)(SO4)(2)Cl-2], bindheimite [Pb2Sb2O7], and smithsonite [ZnCO3]. Likely phases for Zn and Pb adsorption were ferrihydrite, diaspore [AlO(OH)], manganite [(MnO)-O-(III)(OH)], muscovite [KAl2(Si3Al)O-10(OH,F)(2)], biotite [K(Fe,Mg)(3)AlSi3O10(F,OH)(2)], and montmorillonite [Na-0.3(Al,Mg)(2)Si4O10(OH)(2)center dot 8H(2)O]. The large predominance of Fe and Mn (hydr)oxides over other sorbent minerals suggests that the metal sorption behavior is dominated by these (hydr)oxide phases.

URI

https://hdl.handle.net/11511/93872

Journal

WATER AIR AND SOIL POLLUTION

DOI

https://doi.org/10.1007/s11270-008-9937-z

Collections

Department of Environmental Engineering, Article

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Citation Formats

J. G. Moberly et al., “Heavy Metal-Mineral Associations in Coeur d’Alene River Sediments: A Synchrotron-Based Analysis,” WATER AIR AND SOIL POLLUTION, vol. 201, no. 1-4, pp. 195–208, 2009, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/93872.