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. 2021 Jul 1;16(1):26–37. doi: 10.1038/s41396-021-01045-2

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© The Author(s) 2021, corrected publication 2021

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Fig. 2 — Measured total nitrite-N (TNN) and calculated HNO₂ (µM in soil moisture) assuming equilibrium: [HNO₂]/([HNO₂] + [NO₂⁻]) = 1/(1 + 10 ^pH−pKa), where pK_a = 3.398.