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. Author manuscript; available in PMC: 2022 Jan 15.
Published in final edited form as: Atmos Environ (1994). 2020 Oct 14;245:117988. doi: 10.1016/j.atmosenv.2020.117988

Figure 4.

Figure 4.

Spatially resolved Fe L3/L2-edge electron energy loss spectroscopy (EELS) of LAX1 and USC2 samples. A. Representative STEM images and EELS spectra (background subtracted) of particle morphologies; see Fig. S6 for additional STEM images. B. Summary of L3/L2 ratios of Fe-rich PM particles compared with ratios of reference standards. Error bars represent the standard deviation of multiple measurements of reference standards (n > 6). Abbreviations: Fe(0)SS - stainless steel nanoparticles; Ilm - ilmenite (FeTiO3); Mag - magnetite (Fe3O4); Fer - ferrihydrite (am-Fe(OH)3); Hem - hematite (α-Fe2O3); see Fig. S1 and Table S3 for details of reference compound spectra.