Table 1 Absorption bands based on 2nd derivatives of Fig. 4
From: A green approach to clean iron stains from marble surfaces
Wavelength (nm) | ||||||
|---|---|---|---|---|---|---|
Samples | Ferrihydrite/Lepidocrocite/Goethite | Ferrihydrite/Maghemite/Hematite/Goethite/Lepidocrocite | Hematite | Maghemite | ||
C | 380 | 410 | 480 | 520 | 570 | – |
S | 390 | 420 | 480 | 520 | 560 | 620 (w) |