As shown in Fig. 6, a non-linear response of
the DN method was evident, whereas a very good linear
correlation (R2= 0.9996, slope = 1.0123) between the response
of the DN-CO2 method and N2O concentrations (93
× 10−9–1966 ×10−9 mol/mol) was found, indicating that
single point calibration is sufficiently reliable to quantify
N2O concentration by the DN-CO2 method.