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Fig. 3. Solution 31P NMR spectra of NaOH–EDTA extracts of three temperate pasture soils from England and Wales. Extracts were analyzed untreated and after pretreatment by hypobromite oxidation to destroy all organic matter except the inositol phosphates. Brominated samples were analyzed after redissolving in either 1.0 M NaOH or 1.0 M NaOH plus 0.1 M EDTA. Chemical shifts are shown in ppm relative to an external H3PO4 standard. All spectra are plotted using a 5-Hz line broadening, except the inset spectra of the brominated extracts redissolved in NaOH plus EDTA, which are plotted with 1-Hz line broadening to preserve enhanced spectral resolution.
