Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/64649
Type: | Conference paper |
Title: | A quantitative assessment of phosphorus forms in Australian soils |
Author: | Doolette, A. Smernik, R. Dougherty, W. |
Citation: | Proceedings 19th World Congress of Soil Science: Soil solutions for a changing world, Brisbane, Australia, 1-6 August, 2010 / R. J. Gilkes and N. Prakongkep (eds.): pp.17-20 |
Publisher: | C S I R O Publishing |
Publisher Place: | DVD |
Issue Date: | 2010 |
ISBN: | 9780646537832 |
Conference Name: | World Congress of Soil Science (19th : 2010 : Brisbane, Queensland) |
Statement of Responsibility: | Ashlea Doolette, Ronald Smernik and Warwick Dougherty |
Abstract: | Solution 31P nuclear magnetic resonance (NMR) spectroscopy is by far the most widely-used spectroscopic technique for the speciation of soil organic P, but is yet to be used to characterise a wide range of Australian soils. Therefore, using this technique we analysed the NaOH-EDTA extracts of 18 diverse Australian soils. The majority of 31P NMR signal was assigned to orthophosphate, representing 46 to 90% of total NaOHEDTA extractable P. Orthophosphate diesters and pyrophosphate were present in all soil extracts, their concentrations ranging from 5 to 87 mg/kg (1-5% of total NaOH-EDTA extractable P) and up to 62 mg/kg (5% of total NaOH-EDTA extractable P) respectively. Up to 12 well-resolved orthophosphate monoesters resonances were identified (α- & β- glycerophosphate, myo-inositol hexakisphosphate (phytate), adenosine- 5´-monophosphate (AMP), scyllo-Inositol hexakisphosphate). Orthophosphate monoesters were dominated by α- & β-glycerophosphate and phytate. All three compounds were assigned in all spectra with concentrations of α- & β glycerophosphate ranging from 1–5% and phytate up to 9% of total NaOH-EDTA extractable P. However, phytate concentrations were considerably lower than values determined previously for other soils. As well as numerous sharp resonances in the monoester region which we attributed to specific P-containing compounds, our results showed a large proportion of monoester P (24–65%) could be assigned to a single broad feature. We suggest that this broad signal is due to organic P found in large molecules such as humic acids. |
Keywords: | Organic phosphorus 31P NMR Australian soils |
Rights: | © 2010 19th World Congress of Soil Science, Soil Solutions for a Changing World 1 – 6 August 2010, Brisbane, Australia. |
Description (link): | http://www.iuss.org/19th%20WCSS/19th%20WCSS_Handbook_REAL%20HANDBOOK_V10_BACK%20COVER%20change.pdf http://trove.nla.gov.au/work/37679232 |
Published version: | http://www.ldd.go.th/swcst/Report/soil/title/Title_A.html |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.