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Table 1 Fe K-edge EXAFS fitting results of Fe(II) reference compounds and sorption samples

From: Effects of humic substances on Fe(II) sorption onto aluminum oxide and clay

Sample Atomic shella
Fe–O Fe–Fe Fe–Al Fe–Si
CN R (Å) σ22) CN R (Å) σ22) CN R (Å) σ22) CN R (Å) σ22)
γ-Al 2 O 3 sorption samples
Organic Type Time             
1 week 5.5 2.12 0.008 4.1 3.15 0.010 1.7 3.15 0.010
4% HA Pre-coat 5 months 5.3 2.12 0.008 3.5 3.15 0.010 1.7 3.15 0.010
4% HA Pre-coat 1 month 5.3 2.11 0.008 3.2 3.15 0.010 1.9 3.15 0.010
4% HA Pre-coat 1 week 5.4 2.11 0.009 3.2 3.15 0.010 1.6 3.15 0.010
1% HA Pre-coat 5 months 5.2 2.13 0.008 3.7 3.15 0.010 2.0 3.15 0.010
1% HA Pre-coat 1 month 5.7 2.12 0.008 3.6 3.15 0.010 2.0 3.15 0.010
1% HA Pre-coat 1 week 5.4 2.12 0.008 3.9 3.15 0.010 2.1 3.15 0.010
4% HA Co-sorb 2 months 5.0 2.12 0.009 3.3 3.15 0.011 1.7 3.15 0.011
4% HA Co-sorb 1 week 5.9 2.10 0.010 2.0 3.14 0.010 1.0 3.14 0.010
4% FA Co-sorb 2 months 5.2 2.12 0.009 3.5 3.15 0.011 1.8 3.15 0.011
4% FA Co-sorb 1 week 5.1 2.10 0.010 2.0 3.14 0.010 1.3 3.14 0.010
Clay sorption samples
Organic Type Time             
1 week 5.9 2.10 0.010 3.9 3.15 0.012 1.8 3.15 0.012
4% HA Pre-coat 5 months 5.4 2.11 0.010 6.0 3.19 0.012 3.8 3.27 0.012
4% HA Pre-coat 1 month 5.1 2.10 0.009 6.0 3.20 0.012 4.6 3.30 0.012
4% HA Pre-coat 1 week 5.4 2.10 0.010 6.0 3.19 0.012 3.8 3.25 0.012
1% HA Pre-coat 1 month 5.4 2.10 0.011 6.0 3.19 0.012 3.9 3.25 0.012
1% HA Pre-coat 1 week 5.6 2.10 0.010 6.0 3.19 0.012 4.3 3.26 0.012
References
Nikischerite 5.4 2.14 0.007 3.9 3.15 0.009 2.1 3.15 0.009
Fe(OH)2 5.2 2.14 0.005 6.0 3.26 0.006
\( {{\text{Fe}}^{\text{II}}}_{{\left( {\text{aq}} \right)}} \) 5.3 2.12 0.009
FeII-FA(aq) 5.5 2.09 0.009
FeII-HA(aq) 5.4 2.09 0.009
Fe(II)/clay@pH 8.0 6.1 2.11 0.010 6.0 3.20 0.012 3.4 3.28 0.012
Fe(II)/SiO2@pH 8.0 5.3 2.12 0.013 6.0 3.23 0.012 4.0 3.31 0.012
Fe(II)/SiO2@pH 7.5 5.2 2.1 0.013 6.0 3.23 0.012 4.0 3.31 0.012
  1. aCN is coordination number, R is interatomic radial distance, and σ2 is Debye–Waller factor. Error estimates for CN ± 25 and ± 40% for the first and second shells, respectively, and ± 0.02 and ± 0.04 Å for first and second shell R