Document Type

Article

Abstract

Gadolinium, and possibly praseodymium, are relatively enriched in the magnetic 24 fractions of Class F fly ashes from Central Appalachian coal sources. Although the enrichment is 25 evident in the inductively coupled plasma–atomic emission spectroscopy (ICP-AES) 26 determinations of the rare earth content, transmission electron microscopy–energy dispersive x-27 ray spectroscopy (TEM-EDS) examination of the fly ash fails to show the sites of the Gd or Pr. 28 This apparent lack of correlation could be due to the inability of the EDS to detect low 29 concentrations of the rare earth elements definitively; interferences in the analytics, leading to 30 false positives in the chemical analysis; or the overlap of the energies of Gd and/or Pr with more 31 abundant elements, leading to inaccurate negative results.

DOI

10.4177/001c.34170

Volume

12

Publication Date

1-1-2022

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