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Table 3 Summary the LCF results from µ-EXAFS and µ-XANES spectra

From: Natural speciation of nickel at the micrometer scale in serpentine (ultramafic) topsoils using microfocused X-ray fluorescence, diffraction, and absorption

Figure Sample Spot label on figure μ-XANES μ-EXAFS μ-XRD Split present Elements at spot (via µ-XRF map) LCF results (standards in Table S2) R-factor from LCF F-test value for n + 1 standards Delta E0 (eV)
Figure S6b s10t2 region 5 mini map J xas J x   x no Ni, Fe 74% iron oxide (Ni-hematite)
25% iron oxide (Ni-ferri pH7)
0.0004 5.4% N/A
Figure S6c s10t2 region 5 mini map M&C xas M x    no Ni, Mn 75% layered serpentine mineral (Ni–Al LDH)
27% manganese oxide (NiTC birn)
0.0003 N/A 0.421 (0.013)
0.429 (0.034)
Figure S6c s10t2 region 5 mini map M&C xas C x    yes Ni, Fe (low) 83% layered serpentine mineral (Ni-serp 5811)
17% iron oxide (Ni-ferrihydrite)
0.006 N/A N/A
Figure S6d s10t2 region 5 mini map Q xas Q x    yes Ni, Mn, Fe 50% Layered serpentine mineral (Ni-serp 5811)
49% iron oxide (Ni-hematite)
0.0005 N/A 0.468 (0.024)
0.435 (0.055)
Figure S12a s11unt map B1 xas1 x x x yes Ni, Fe (low), Mn (low) 39% layered serpentine mineral (Ni-gibbsite)
72% layered serpentine mineral (Ni-serp 5811)
0.084 80% N/A
Figure S12a s11unt map B1 xas2 x x   yes Ni, Fe, Mn (low) 37% layered serpentine mineral (Ni-gibbsite)
74% layered serpentine mineral (Ni-serp 5811)
0.107 64% N/A
Figure S16a s11unt map D2 xas1 x x x yes Ni, Mn 79% layered serpentine mineral (Ni-gibbsite)
10% manganese oxide (Ni-RS birn)
0.044 28% N/A
Figure S16a s11unt map D2 xas2 x x   yes Ni 70% layered serpentine mineral (Ni-gibbsite)
30% layered serpentine mineral (Ni-serp 5811)
0.061 41% N/A
Figure S22 s20unt region 4 map rgn4 xas x x x no Fe, Ni See Fig. 1 N/A N/A N/A
Figure S23b s20unt region 6 mini map A spA x   x yes Ni 67% layered serpentine mineral (Ni–Al LDH)
33% layered serpentine mineral (Ni-serp 5811)
0.0006 1% 0.400 (0.078)
0.400 (0.033)
Figure S23c s20unt region 6 mini map B xas1 x x   no Ni, Fe 46% layered serpentine mineral (Ni-gibbsite)
55% iron oxide (Ni-hem pH7)
0.068 9% N/A
Figure S23c s20unt region 6 mini map B xas2 x x   yes Ni, Fe (low) 42% layered serpentine mineral (Ni-silicate)
75% layered serpentine mineral (Ni-serp 5811)
0.062 10% N/A
Figure S23c s20unt region 6 mini map B xas3 x x   no Ni, Fe low), Mn 73% manganese oxide (Ni-RS birn)
34% layered serpentine mineral (Ni-serp 96)
0.037 8% N/A
  1. Samples with µ-XANES and µ-EXAFS data are identified along with those samples where complementary µ-XRD spectra were obtained. The presence of a split shoulder at 8400 eV and 3.7 Å−1 for µ-XANES and µ-EXAFS data, respectively, is also indicated along with the elements present at that location according the µ-XRF maps. Error values for E0 are adjacent in parentheses (see Additional file 1: Text S2.4.)
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