Table 1. Phosphorus Composition of NaOH–EDTA Extracts of Three Soils Determined by Solution 31P NMR Spectroscopy with or without Pretreatment by Hypobromite Oxidationa.
% of
total spectra area |
|||||||
---|---|---|---|---|---|---|---|
inorganic
phosphorus |
organic
phosphorus |
||||||
soil | pretreatment | orthophosphate | pyrophosphate | phosphomonoester | phospholipid | DNA | phosphonate |
East 50 | none | 20.3 | 2.4 | 67.1 | 1.8 | 5.9 | 2.4 |
bromination | 42.3 | 0.7 | 57.0 | 0 | 0 | 0 | |
West 18 | none | 18.8 | 1.4 | 66.4 | 4.4 | 7.5 | 1.5 |
bromination | 43.4 | 0.7 | 55.7 | 0 | 0 | 0 | |
West 22 | none | 17.3 | 2.3 | 70.2 | 3.9 | 5.2 | 1.2 |
bromination | 47.2 | 2.6 | 50.2 | 0 | 0 | 0 |
Values are the proportion (%) of the total spectral area assigned to functional groups of phosphorus compounds.