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. Author manuscript; available in PMC: 2020 Sep 23.
Published in final edited form as: Nat Geosci. 2020 Mar 23;13(5):344–348. doi: 10.1038/s41561-020-0556-7

Fig. 2. Photochemical oxidation of phosphite.

Fig. 2

a – 31P NMR Spectrum of a commercial sample of phosphite at pH 6.5; b – 31P NMR Spectrum of the irradiation of phosphite (30 mM) in 10% D2O after 4 h; c – 31P NMR Spectrum of the irradiation of phosphite (30 mM) in the presence of NaSH (50 mM) after 4 h according to Procedure 1; d – As spectrum C after 8 h irradiation. Differences in chemical shift are due to slight variations in pH.