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Published online 8 June 2007
Published in Soil Sci Soc Am J 71:1111-1118 (2007)
DOI: 10.2136/sssaj2006.0300
© 2007 Soil Science Society of America
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On the Use of Hydrofluoric Acid Pretreatment of Soils for Phosphorus-31 Nuclear Magnetic Resonance Analyses

Warwick J. Dougherty*, Ronald J. Smernik, Else K. Bünemann and David J. Chittleborough

Soil and Land Systems, School of Earth and Environmental Sciences, Univ. of Adelaide, South Australia 5064, Australia


Figure 1
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  		Fig. 1. Cumulative amount of organic P (black) and inorganic P (gray) extracted during the 24-h extractions of soils with HF.

 

Figure 2
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  		Fig. 2. Solid-state 31P cross-polarization nuclear magnetic resonance spectra of whole soils and residues following 24-h extractions with HF.

 

Figure 3
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  		Fig. 3. Solid-state 31P direct polarization (DP) nuclear magnetic resonance spectra of whole soils and residues following 24-h extractions with HF. The Hamilton DP spectrum contained no discernible features and thus is not presented.

 

Figure 4
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  		Fig. 4. Solution 31P nuclear magnetic resonance spectrum of neat HF extract of Camden soil.

 

Figure 5
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  		Fig. 5. Solution 31P nuclear magnetic resonance spectra of NaOH–EDTA extracts of whole soils (top traces of each pair) and HF residues (bottom traces). Resonances assigned to phytate are marked with an asterisk (*).The spectrum obtained from the HF residue of the Waite soil was of very poor quality and is not shown.

 




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