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. 2014 Oct 17;9(10):e110335. doi: 10.1371/journal.pone.0110335

Figure 2. (a) δ15NNO3+NO2 (log scale) of higher sensitivity equilibrations of 10 µmol L−1 nitrate solutions (10 mL) with 2 mL of 15N2 gas from a Cambridge Isotopes or a Sigma-Aldrich bottle.

Figure 2

(b) Corresponding apparent δ18ONO3 (log scale) of higher sensitivity equilibrations of the two stocks. n = the number of experimental replicates.