Improvement of quantitative solution 31P NMR analysis of soil organic P: a study of spin–lattice relaxation responding to paramagnetic ions

Table 2 T₁ values of model P compounds added to soil extracts with a paramagnetic ion concentration of 20, 50, and 100 mg L⁻¹

Paramagnetic ion concentration (mg L⁻¹)	T₁ (s)
Paramagnetic ion concentration (mg L⁻¹)	Orthophosphate	Pyrophosphate	Phytic acid	Deoxyribonucleic acid
20	3.39	2.78	0.07	0.63
50	2.80	2.45	0.07	0.62
100	1.29	1.26	0.14	0.69

ISSN: 1467-4866