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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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Geochemical Transactions

ISSN: 1467-4866

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