Fig. 2. Phosphorus-31 nuclear magnetic resonance (NMR) spectra of a blank sample containing Sephadex G-25 (fine) gel and ultrapure water (top), a sample containing 1 mL of Sephadex gel and 40 mg P as phytic acid (center), and a sample of Sephadex gel that had been mixed with 10 mL of 0.5 M NaOH soil extract (bottom).