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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1107/S1600577518013334
|2 doi
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|a pubmed25n0967.xml
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|a (DE-627)NLM290399696
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|a (NLM)30407184
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Prietzel, Jörg
|e verfasserin
|4 aut
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|a Phosphorus K-edge XANES spectroscopy has probably often underestimated iron oxyhydroxide-bound P in soils
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 09.11.2018
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|a Date Revised 09.11.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Phosphorus (P) K-edge X-ray absorption near-edge structure (XANES) spectra of orthophosphate (oPO4) bound to soil FeIII minerals (e.g. ferrihydrite, goethite) show a pre-edge signal at 2148-2152 eV. It is unknown whether organic P bound to FeIII oxyhydroxides also show this feature. Otherwise, Fe-bound soil P may be underestimated by P K-edge XANES spectroscopy, because a large portion of Fe oxyhydroxide-bound P in soils is organic P. K-edge XANES spectra were obtained for different organic P compounds present in soils [inositol hexaphosphate (IHP), glucose-6-phosphate (G6P), adenosine triphosphate (ATP)] after sorption to ferrihydrite or goethite and compared with spectra of oPO4 adsorbed to these minerals. P sorption to ferrihydrite increased in the sequence IHP ≪ G6P < oPO4 < ATP. P sorption to goethite increased in the sequence G6P < oPO4 ≪ ATP = IHP. Pre-edge signals in P K-edge XANES spectra of organic P adsorbed to Fe oxyhydroxides were markedly smaller compared with those of oPO4 adsorbed to these minerals and absent for FeIII oxyhydroxide-bound ATP as well as goethite-bound IHP. Linear combination fitting (LCF) performed on spectra of IHP, G6P or ATP adsorbed to ferrihydrite or goethite, using only spectra of FeIII oxyhydroxide-bound oPO4 as reference compounds for Fe-bound P, erroneously assigned >93% (ferrihydrite) or >41% (goethite) of Fe-bound P to non-Fe-bound P species. Inclusion of FeIII oxyhydroxide-bound IHP as reference compounds markedly increased the recovery of oxyhydroxide-bound organic P. Thus, Fe-bound soil P has probably often been underestimated by LCF in soil XANES studies where IHP adsorbed to ferrihydrite and to goethite were not included as reference compounds
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|a Journal Article
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|a Fe-bound P
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|a IHP
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|a K-edge XANES spectra
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|a LCF
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|a P retention
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|a P speciation
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|a ferrihydrite
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|a goethite
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|a organic P
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|a soil
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|a Klysubun, Wantana
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Journal of synchrotron radiation
|d 1994
|g 25(2018), Pt 6 vom: 01. Nov., Seite 1736-1744
|w (DE-627)NLM09824129X
|x 1600-5775
|7 nnas
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| 773 |
1 |
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|g volume:25
|g year:2018
|g number:Pt 6
|g day:01
|g month:11
|g pages:1736-1744
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|u http://dx.doi.org/10.1107/S1600577518013334
|3 Volltext
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|a AR
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|d 25
|j 2018
|e Pt 6
|b 01
|c 11
|h 1736-1744
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