Table 1. Phosphorus Composition of NaOH–EDTA Extracts of Three Soils Determined by Solution ³¹P NMR Spectroscopy with or without Pretreatment by Hypobromite Oxidation^a.

		% 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

^aValues are the proportion (%) of the total spectral area assigned to functional groups of phosphorus compounds.