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. 2021 Apr 8;7(4):e06674. doi: 10.1016/j.heliyon.2021.e06674

Figure 9.

Figure 9

EDX spectra of the iron surface before (a) and after 24h of immersion in the acid rain solution (b), and in the presence of 1000 ppm of FOD (c) or 1000 ppm of FNOD (d).