Fig. 2From: Improvement of quantitative solution 31P NMR analysis of soil organic P: a study of spin–lattice relaxation responding to paramagnetic ionsInversion recovery method determining the T1 value of model P compounds taking phytic acid in neutral solution as an example. a Inversion recovery stacked spectra of phytic acid with 10 τ used and b regression analysis determining the T1 value of phytic acid by fitting the 10 intensity plots with the function (1 − exp(−τ/T1)Back to article page