Figure 2
From: A method for preparation and cleaning of uniformly sized arsenopyrite particles
XPS spectra depicting speciation of As, Fe, and S on arsenopyrite. Representative curve fitted XPS spectra for (A) arsenic - As 3d, (B) iron- Fe 2p, and (C) sulfur - S 2p, for a sample of arsenopyrite prior to any treatments to remove surface oxidation. (D) Arsenic- As 3d, (E) iron- Fe 2p, and (F) sulfur- S 2p, for a sample of arsenopyrite treated with 12N HCl to remove surface oxides.