Fig. 2: Concentrations of HNO2.

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

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