Supplemental Information - Phosphorus Speciation of Sequential Extracts of Organic Amendments Using Nuclear Magnetic Resonance and X-ray Absorption Near-Edge Structure Spectroscopies by Ajiboye et al.

Supplemental text, and three supplemental figures - Ajiboye et al.

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• Supplemental text - Supplemental text.
• Fig i. - Figure i. P 1s XANES spectra of inorganic reference compounds displayed as normalized absorption, in arbitrary units, plotted against the photon energy (in eV). The reference compounds include FeP: phosphosiderite, PSIDER (monoclinic FePO4•2H2O), strengite, STRENG (orthorhombic FePO4•2H2O); CaP: dicalcium phosphate, DCP (CaHPO4), dicalcium phosphate dihydrate, DCPD (CaHPO4•2H2O), â-tricalcium phosphate, â-TRICAL (Ca3(PO4)2), and hydroxyapatite, HAP (Ca10(PO4)6(OH)2); AlP: variscite, VAR (AlPO4•2H2O), wavellite, WAVE (Al3(PO4)2(OH,F)3•5H2O); MgP: newberryite, NEWBER (MgHPO4•3H2O), struvite, STRUV (MgNH4PO4•6H2O); NH4+P: ammonium phosphate monobasic, APM (NH4H2PO4), ammonium phosphate dibasic, APD (NH4)2HPO4); NaP: sodium phosphate dibasic, SPD (Na2HPO4), sodium pyrophosphate dibasic, PYRO (Na2H2P2O7). The spectra of each group of reference compounds were plotted with a slight vertical displacement to aid comparison of the features. (i) the pre-edge of FeP, (ii) shoulder of CaP, (iii) 2161 eV peak (iv) 2163 peak, and (v and vi) various oxygen resonances.
• Fig. ii. - Figure ii. P 1s XANES spectra of organic P including adenosine 5-monophosphate, AMP, adenosine 5-triphosphate, ATP, deoxyribonucleic acid, DNA, phosphatidyl choline, PC, phosphatidyl ethanolamine, PEA, and phytic acid.
• Fig. iii. - Figure iii. Normalized P 1s XANES spectra of intact (unextracted) organic amendments. The spectra were plotted with slight vertical displacement to aid comparison of the features.