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Table 1 Bulk soil chemical analysis and XAS linear combination fitting results for the first application of TPP

From: Chemical speciation and fate of tripolyphosphate after application to a calcareous soil

Label Depth (m) Soila pH Total elemental concentrationsb Ca:Mg ratio Labilec extractable P (mg P/kg soil) LCF analysis resultsd,e Reduced chi2
Ca (mg/kg soil) Mg (mg/kg soil) P (mg/kg soil) Fe (mg/kg soil) Adsorbed P (%) Ca-P species (%)f
1a 1.82 7.7 23,800 14,900 950 24,500 1.6:1 10 38 70 0.00141
2a 3.66 7.7 36,000 16,000 910 26,500 2.25:1 10 33 70 0.00131
3a 1.82 7.8 25,400 16,900 880 26,700 1.5:1 23 48 56 0.00310
4a 3.66 7.5 32,400 21,800 1050 19,000 1.5:1 21 48 59 0.00127
5a 1.82 7.7 28,000 15,400 880 24,500 1.8:1 5 46 58 0.00142
6a 3.04 7.7 30,300 18,000 940 29,000 1.7:1 25 42 65 0.00110
7a 3.66 7.6 10,900 9100 1080 8100 1.2:1 75 45 52 0.00127
8a 1.82 7.7 28,300 18,600 1010 28,300 1.5:1 15 42 65 0.00123
9a 3.66 7.8 28,000 17,900 950 28,000 1.6:1 15 44 58 0.00149
10a 1.82 7.7 25,700 13,400 915 25,700 1.7:1 10 24 80 0.00219
11a 3.66 7.8 28,900 17,300 950 28,900 1.6:1 20 40 62 0.00054
  1. aSoil pH accurate to ± 0.1
  2. bVia total XRF elemental analysis, concentrations are accurate to ± 10%
  3. cCombination of H2O and NaHCO3 extractable P
  4. dEo Shift constrained to zero
  5. e% Relative contribution to XAS signal; models are unconstrained and not equal to 100%
  6. fRelative sum of the contribution from calcium phosphate mineral species