Abstract
Synopsis The elements in discolored nails were assessed by X-ray fluorescence analysis (XRF), and the chemical state of Zn in the nail samples was assessed by X-ray absorption fine structure (XAFS) analysis. Compared to the normal nail, a part of the yellow nail contained a considerably high amount of Ca, whereas the black nail contained higher amounts of Ca and Zn. The chemical state of Zn in the yellow nail was similar to that in the normal nail. The Zn in the black nail was in a slightly different chemical state, suggesting the existence of different chemical species of Zn in the black nail.
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