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Table 3 Summary of linear combination, least-squares fits to EXAFS spectra

From: Arsenic species in weathering mine tailings and biogenic solids at the Lava Cap Mine Superfund Site, Nevada City, CA

Sample Component (%)1    Total χ2s2
  FeAsS Fe(S,As)2 Arseniosiderite3 H3AsO3(aq) As(V)- Fe3+(hydr)oxide   
Group 1- Ore and Mill Tailings samples
Ore samples        
97-LCD1 96 4 7 0 0 107 139
97-LCD3 33 69 0 0 2 104 804
Submerged tailings in lake or pond     
99-LL12-cs1 69 4 5 0 0 78 171
99-LL12-cs2 78 6 8 0 0 92 146
99-LL6-cs 61 5 12 0 0 78 355
00-LL5-cs 49 5 17 0 0 71 225
99-LL2-ss1 70 5 17 0 6 99 203
Sediment at water line, lake and pond     
99-LL4-ss1 56 4 26 0 0 86 587
00-LL2-ss 91 3 4 0 0 98 234
Subareal, near lake or pond   0   
99-LL2-ss2 15 1 33 0 39 88 78
99-LL4-ss2 45 1 27 0 37 110 60
Group 2-Microbiological samples      
99-LL10-m 0 0 0 34 71 105 114
99-LL2-m1 0 0 0 24 74 98 86
99-LL2-m2 0 0 0 19 76 95 76
99-LL2-wf 0 0 0 45 3 48 295
00-LCD-m1 0 0 0 60 60 120 137
00-LCD-m2 0 0 0 73 45 118 1408
00-LCD-m3 0 0 0 14 79 93 156
  1. 1. Fit error per component is estimated to be 10%. 2.χ2is defined as the sum of squares of the residuals.. 3Ca3Fe4(AsO4)4(OH)6•3H2O.