XAFS study of arsenical nickel hydroxide

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Abstract

To Investigate the role played by nickel co-ions in contributing to the stability of arsenic, fluorescence XAFS measurements at both arsenic K-edge and nickel K-edge, respectively, on amorphous arsenical nickel hydroxide, crystalline arsenical nickel hydroxide, and annabergite reference compounds have been carried out. The XAFS results indicate that the arsenic-bearing nickel hydroxides have a well-defined arsenic local structure with multiple coordination shells, suggesting a compound formation mechanism instead of surface adsorption. The degradation of the arsenic local structure in the crystalline arsenical nickel hydroxide is observed. The XAFS of annabergites are compared to that of the arsenical nickel hydroxide and possible structural models are discussed.

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Chen, N., Kim, E., Arthur, Z., Daenzer, R., Warner, J., Demopoulos, G. P., … Jiang, D. T. (2013). XAFS study of arsenical nickel hydroxide. In Journal of Physics: Conference Series (Vol. 430). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/430/1/012092

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